If that amp uses a feedback resistor from the speaker output to somewhere before or in the phase splitter you may want to play around with the resistor value to vary the amount of negative feedback. Oh and as others have mentioned, twisting the control grid wires together and separately the anode wires together will help balance and cancel the crap being radiated by the anode leads and cancel the crap being picked up by the control grid leads and help with killing stray oscillations. Heck may as well slap a 150pf or more or less capacitor between the control grids to snuff out parasitic oscillations until you get around to mounting things in a more dressed chassis. And man thanks for doing this! This is awesome!!
I misread the text in the thumbnail: "russian LUBE experiment" (and in the background all those glass things and electrodes) Now, I gonna have nightmares for weeks....
You nailed the problem at the 19:40 mark. Twist heater wires, fit grid stop resistors and screen resistor right at the tube socket, and twist anode wires. I have chased way too many odd distortion faults in production amplifiers that came down to some combination of these things.
This tube is the Russian pendant to the QQE 06/40 that was widely used in amplifiers for frequency domain multiplex phone lines over coaxial cables (analog) . The QQE is also used by HAMs to build short wave transmitters. I have used rhe QQE to build RF-generators for scientific applications and also tried its russian cousin, which worked just as well.
I would like to recommend the 829 tube by RCA. It is the exact same tube. That Russian tube was an RCA design shared by the United States during world war II with the Russians. The nice thing is there is limited use for the tube so they even in new old stock American manufactured do not cost a lot.
I love doing this as well. There's 1000's of tubes designed for other uses that work as amplifiers. A tube doesn't have to be specifically made for audio usage to work as an amplifier. For instance the most popular audio tube in the world, the 12AX7, wasn't designed just for audio. It has many diversified applications such as multivibrators or oscillators in industrial control devices. Many different High-Mu Twin Triodes will work just the same. You may have to change socket types, rewire sockets, and change voltages, but they will do the job just as well. The 12AX7 was chosen for use in guitar amps mainly for standardization and availability, not necessarily because it sounds the best. Anyway, like you are doing, the spec sheet is the best way to ascertain whether or not a tube will work in your application. I'm always buying tube assortments, it's fun to experiment. And you may find your new unique tone!
Wow this is literally my pos-soviet childhood dream coming true. I remember playing with those tubes at my grandfathers dacha and later when I started playing guitar and diving into electronics as a teenager when I visited my granddad I was always thinking - what if I could make an amplifier with this big weird cool-looking thing! But I couldn't due to my very limited knowledge. Thank you for bringing the good memories!
I enjoyed the video, I'd be glad to see a follow-up with 2 gu-29s. Seems to me that you have a good idea on how to improve it with grid stop resistors, wiring etc. I've used soviet tubes for anything from Tesla coils to x-rays, good fun!
I put off posting this video for a long time to see if I would follow it up. You'll notice I list the date of when my videos are filmed. I have yet to do anything else with these tubes. I have a couple ideas, just, when, you know. It'll likely be a while yet.
@@DATT Ahh I see, fair enough. Well thanks for the reply I'll be looking forward to the next project regardless of whether or not it is relevant to this project!
The problem with these RF tubes is that they expect you to drive the controll grids positive against the cathode, which means it will draw grid current which means extra distortion. And thus the ugly sounds its making, The driver is literary running out of steam as the grids are driven positive. HOWEVER, Fear no more, there is a solution, DO NOT BE AFRAID and hook that G2 into a UL tap or 400VDC. EXPECT youll need arround -60 or -80V to bias the tube, but then you get the power you desire. The reason for the 250VDC G2 limit on these tubes is because they are meant to be driven into RF ranges where G2 will dissapate during operation a lot more power than in DC operation. And thus you can afford using the tube as I described. Though I think it would be beneficial to put a 1kOhm resistor in series with each of the G2s The same problem applies with the GU50s. RF tubes, they say its limited to 200VG2 I say hook it up to 800V and see what happens in audio. I would not be afraid to go as far as pushing the pair of GU50s at 1kV with the screen grids UL tapped from an 8kOhm primary and drive it nuts into 120W or more (So you would likely need a grid signal equally high which is a problem with these tubes as their gain is kinda shit for audio ampliffication where you need long sustained currents (20kHz is still AC yes, but it does not hold a candle against the 200MHz this thing can do.
Hmm, I'm not sure I understand your first statement, but the second, I do notice a lot of tubes ask for a much lower G2 voltage, but amps with just give them the beans anyway. If I understand what you're saying correctly, lowering the G2 as I did is one of the reasons for the lame tone ? A 1k on the G2 is standard in all my tube amps. YOu think this 29 could handle like 700v on both the Anode and G2 ?
If the tube has separate cathodes, you can use two constant current cathode sources that will always keep the tube in balance regardless of tube age. Use a LM337 IC. for each cathode. Very simple to install or modify, Works great on my 50 yr old Heathkit stereo power amplifier. Adjust the current limiter to match the maximum plate dissipation. Will keep it very linear.
Ever since I saw Styro Pyro make a Tesla coil with a Russian GU-5B Triode tube I've wanted to see someone use some obnoxious large tube like out of a Radar system or something. This is super awesome, especially since you were getting a nice chug tone and not just playing boomer blues licks.
Oh yeah, that's a BIG power tube you've mentioned. And yeah, I'm a metal play originally, I do a bit more of that bluesy stuff now, but it did/does annoy me how a lot of gear reviewers and testers don't do so with more aggressive tones.
@@DATT yeah it's crazy big, would probably be quite a project to make one work for audio haha. Metal and punk is all I know but I love tube amps and weird projects so your channel is right up my alley haha.
@@CryptToneMusic I think some of those massive tubes were still used for the longest time in broadcast cause they simply didn't make transistors that strong. Probably changed by now. But I know they were still using them, and making them in the 90's and early 2000's.
@@DATT thats pretty wild, I'm not sure but I think tubes were used in radar as well for longer than you would think. It's crazy to think of tubes and mostly analog circuitry used in jets that were possibly going past the sound barrier
@@CryptToneMusic Oh definitely, anything that needed to manage a lot of wattage. There is this other odd soviet tube that comes up from time to time, the 6C33c, it's about the same physical size as these, or at least they use the same socket, I read it was used in the MIG jets.
Cool video, might be worth building a new amp around these tubes if you want to pursue it further, and voice the preamp to get the desired sound with these tubes. I recall DAR amps building a few different designs using oddball russian tubes, before disappearing off the face of the earth about 10 years ago. From memory I think some even had no output transformer because the tubes used had a low enough output impedance to drive a speaker directly.
Hah, I can't see building a whole amp jsut for these tubes, but I can see eventually retro fitting them into the right amp. I have some ideas. Yeah, DAR was using the 6C33C, which is a lower voltage tube, setting the circuit up like a solid state transistor circuit let them run the speaker directly cause the voltages and current they operated at were close to the voltages and currents speakers run at.
@@DATT this tube you experimented with is a two stage system . Two in one envelope . Um , and you say it came from a video system ? 😎 cool ! You can’t argue with that .
This is a high frequency tube. Put the resistors in series, in the circuit of the first grids. As close to the tube as possible. Against excitation at high frequencies
this reminds me of the rare af DAR Amplification guitar amps like the Tuzia and FBM100, they used same or similar large tubes and they sound great. too bad they couldn't be made reliable enough with all the heat they put out.
Ohh, Looks like the FBM uses the 6C33C. Those actually use the same socket as this tube. Yeah, the 6C33 is a lower voltage, thus a higher current tube to get the same wattage. I imagine it could run pretty hot. I've always wanted to play with the 6C33, but having to redesign an amp to run at a much lower voltage seemed like more work than I cared for. They often don't even have output transformers cause they can operate at speaker voltages, and the circuits will be a lot like a SS transistor Push-Pull.
@DATT maybe you should try making the most basic bespoke amp from a parts bin, because those amps did have some fucking MEAT in their tone. ive lusted after that sound since i heard it and watching someone try and build something would be great and significantly cheaper than spending $7 to 10k on a rather temperamental NAMM queen.
@@KrispieKomrad Ohh, bespoke basic parts amp. I did. I think, if I understand you correctly. Try the Oddball kit amp. ruclips.net/p/PLr1eiFOCdnl8g4NpyBalve_b4wejnNlxF
Groove Tubes are just relabeled other tube. Could be Sovtek. I do really like playing with tubes. I find this amp can really roar with EL34's or JJ 6CA7's.
Perhaps you will like the ГУ-50 better. A thousand years ago, when I was young, in the USSR, we used exactly these. By the way, ГУ-50 can be used with a radiator.
@@DATT The GU-50 has a flat aluminum frame on top. An aluminum finned radiator can be screwed to it in the center. Those used in the old days did not have a fan or thermal paste, but significantly eased the temperature regime when working at maximum power.
@@АндрейНикитенко-ф4с Ohhh, we'd call that a "heatsink" where I'm from. Hah, that' cool, literally. Traynor, a Canadian amp maker had these amps that would deliver more wattage then spec, and they put fans in the amp to keep them cool, otherwise, you could blow them.
Double Tetrode GU29 is desingned for Vhf RF power reverse tacted amplifiers run up to 400Mhz And you will really amplify Audio Signals! Good luck with self oscillating generating and stressing the Neigbours Radios😉
That tube looks very very similar to a US standard tube the, 829b. I suspect it is a pretty close copy. It was designed for transmitters at up to a couple of hundred megahertz, maybe outputting up to 100 watts.
Ahh yes, the 829 sounds familiar. I think it is an equivalent if I recall correctly. I know this is a high FQ transmitting tube, I find it hard to believe you could get a 100w out of it alone, but then, I don't really know much about TX amps.
@@DATT There are two styles of tube ratings CCS--Constant Commercial Service and ICAS--Intermittent Commercial and Amateur Service. There was quite a difference in maximum power levels. I able to easily find it online. Max power input for CCS was 60 watts, 90 watts ICAS, without forced air cooling, somewhat more with.
maybe with the second GU-29 you might be able to get the mids to sound better? Not really sure if I understand how it works tho :) very interesting videos you have though, always fun to watch :)
But the vacuum inside the tube is "Soviet")). (the joke of radio amateurs about the "capitalist and socialist vacuum" in tubes of the same type is better)))
@@IgorMuravyov-o5r some are doing good, some got potato dictator, some have to fight Pu's bullshit, some just live life. And I think all of them pay shool teachers more that Russia does.
What is the difference between a audio beam power tube and an RF beam powered tube? Depending on the frequencies you want to run not a lot. They tried to keep the input capacitance to the grids lower but that's about it.
as u already know thats os-killation way too long leads, no stopper resistors, had the same with hitachi based diy mosfet amps , would be very interesting to scope it as is just to see how severe it is got the same thing going on with a diy tube tester i built, fine for 12au7s ect but as soon as i jam in something beefy like el34 gauges flick all over the place the moment i draw some current, yet to get round to that
Yeah, I didn't realize it at the time. But it was obvious to be in editing. This vid could of been a lot different. I was recently working on an old Traynor head that when unstable after I changed out the Output transformer. It took me to damn long to realize it was just the layout but the grid stoppers too far from the actual tubes.
Yeah, that's a rabbit hole I've stayed away from. Couldn't even afford to get started in that. I tend to be a simple man when it comes to audio. I have standard, but usually a good receiver and a nice pair of speakers will do. I got these tall vintage Mirage's up in my living room that were suppose to be pretty high end back in the early 80s.
I’ve heard a gu-29 in push-pull configuration. I can’t remember exactly what it sounded like but I don’t remember hearing anything bad like you’re experiencing
Wow, I'm not surprised they're so unbalanced. The datasheet says for a fixed voltage, the anode current can be anywhere from 38 to 85mA. I think that'd be per section. The instability sounds like parasitic oscillation so maybe check the output on an oscilloscope. It might be more stable with some capacitors wired from screen to cathode on the tube socket. Looking forward to more!
Oh it was def parasitic oscillation. It's like a knew it at the time, but I didn't know what to do about it. In editing I'm sitting here like "Bud, all you needed to do was put some resistors on the control grids at the socket, and it'd probably solved most the issues.
you just gotta build an amp around it. First much less gain hitting those grids, I would say maybe like a 6SJ7 and use a 6SN7 for the P.I. if you need another gain stage use a single triode like a 6J5 or if you need more gain a 6SQ7 with the diodes grounded or a 6F5.This is only an educated guess though. When I first started building amps from scratch and designing circuits I always used too much/many gain stages, sometime less is more, you can get a nice somewhat clean powerful tone and add a pedal to hit the front end how you want. Maybe try a grid stopper resistor.
Those are all very exotic tubes for a grinding guitar amp. And I really don't know that there is much gain hitting the tubes, you're not hearing a cranked amp tone really. It's a metal voiced amp with a lot of distortion texture generated in the preamp.
@@DATT You just made my point for me, a metal voiced amp with a lot of distortion texture generated in the preamp, that is excatly what I was saying, I believe there is excessive gain in the preamp. I have been building amps for a long time and I learned that lesson early on. I would have to look at the schematic though and I have no experience with that power tube. What I mean is the same preamp that sounds fantastic with a pair of 6V6s will hit the grid of EL84's too hard, you have to bias EL84's differently as well as add large grid stoppers to get similar results. Anyway, I think it is cool that you experiment with weird tubes, I have always done so, there are damper tubes which can be used as rectifiers, and horizontal deflection amps which make killer power tubes etc. Cheers and experiment away.
@@skullheadwater9839 Looks up the schematic for a Soldano SLO, that's what this amp is based on. It's deliberately designed to have the sound of excessive gain. How ever, these amps work by just a series of clipping stages. SO for the most part, it suppose to sound this way and it's not actually hitting the tubes with that gain. Mind you, I'm now wondering if you're refering to the blocking distortion I was getting that made it sound like farty and compressed at one point, which yeah, that is a product is hitting the power tube too hard. I guess there could be more tweeks that need to be done to run these properly, like updated grid stop values.
Hah, it's both. I know what you mean tho, the output voltage will change proportional to the input voltage, which is not technically a regulator, but it fine for this application. Basically an adjustable high wattage dropping resistor. But yeah, filtering ripple is another effect it'll have.
Question: what is the output transformers primary impedance, and what is the load impedance called for on the tubes data sheet… how well are you matched there? I’m glad you are doing here what I had thought about doing a month ago… granted I didn’t have a particular tube in mind. Funny that you mentioned rob robinette… my idea was to build something like the 20 or 40 watt nakked amp he has got on there with an oddball tube… or do some further experimentation with other oddball tubes to see what sounds best. I really want to make a 1x12” 20 watt combo version of the SLO clone. It is just too loud to play in the house, and it really opens up at the point of disturbing the neighborhood.
Funny thing I'm not using an SLO transformer, I'm using an aftermarket replacement Hammond for a Fender "The Twin". 100w rated 2.35k, but "overloading" the secondary to use it as a 50w transformer, so 4.7k ? I have a video about it in my "Jet City Violence" playlist, where I replace the transformer in this head, and compare it against a couple others.
What Rock did you crawl out from under, 6146, 807 ETC were all used in both Audio and RF Amps as were many others. The Soviet tubes became very popular after the US Stopped manufacture of Tubes or Valves as the Brits like to call them. the Russian tubes were not bad at all, in fact some were much more rugged than the North American equivalent. Think of the terrain they have and this will give you a start, then there is their lack of skilled technicians. The Canadians used the Russian Tubes in their tube gear the they could no longer acquire North American tubes. the Soviet tubes are reliable if nothing else.
There still exists tube substitution manuals. I does take a while to find. there is a market for tube Power Amplifiers and maintaining them is becoming an art. Plus there are those who believe the spectral purity of the Tube/Valve Power Amplifier is superior to the equivalent solid state Power Amplifier
What a soud quality check do you with an audio signal purposedly distorted?? On my phone spunded bad. Make the check with nearly sin wave signal and a high efficiency horn speaker cabinet.
It's a metal guitar amp, the sound of the tube at full playing distortion is the only thing that matters. And amp of the nature can't even really do a proper clean tone. But yeah, my recording of that sound is not the best. Also, You can't really tell the sound of something from a recording, especially not listening on a phone.
If you want to be good with fistortioms, then take a MOS amplifier coping with at least 500 kHz linear power output (f. ex. 300W), and drive with any signal you want. Bee careful it will blow the speaker and your ears because of too much and powerful high frequencies.
у тебя приведенное сопротивление нагрузки отличается и перемотать выходной трансформатор было бы не плохо, но наверное для гитарного усилителя и так сойдет. =)
What you have there is a clone of the RCA 829B, designed to function as a push-pull VHF amplifier. I have a bunch, brand new RCA's. Want some? (Who am I? Retired RF engineer mid 60's..Been in RF since '70) Thousand of tubes in my collection. Maybe you guitar gods would like some 4-1000's, 4cx35000c, etc! LOL! 833a's?? 810's, 805.s 813's! I'd use the 813's myself for audio application. Matter of fact back in the 50's drive in's would use the 813 tube for audio. >700watts! AB1!
@@DATT , если напряжение истока не может расти, не поспевает за напряжением затвора, по разным причинам, например емкость нагрузки высокая или нагрузка слишком большая, или короткое замыкание на нагрузке, то потенциал между затвором и истоком может стать опасно высоким, если оно станет выше 12 вольт (для большинства полевых транзисторов) то произойдет пробой диэлектрика затвора, и транзистор сгорит. затвор-сток станет короткозамкнутым навсегда(так можно узнать как полевой транзистор сломался). для этого и нужен стабилитрон. есть полевые транзисторы со встроенным супрессором между затвором и истоком, но это не одно и тоже, ток такого супрессора очень маленький, как правело до одного миллиампера, поэтому в подобных схемах, когда нагрузка в истоке, необходимо включать в схему защитный стабилитрон.
I remember in the early 90’s there were big pedals billed as having Soviet tubes in them and thus giving them a unique sound. I forget what they were called but they played up on the Soviet aesthetic. Pretty clever way to capitalize on communism.😂
@@ihascupquake100 Yeah- that’s it! The early ones looked like Russian shoe mines or Geiger counters…. Just drab olive green boxes with a couple dials and a toggle switch. Thanks!
Sounds like the Big Muff Pi. They in particular didn't have tubes, just made by the same company that made tubes. I wonder if there are sovtek tube pedals out there. I might look that up later.
I heard that the Russians are still experts in vacuum tubes. The military preferred them because, unlike transistors, a vacuum tube easily survives the electromagnetic pulse of a nuclear strike. Transistors and microcircuits simply burn out. I have seen Russian homemade products on tiny vacuum tubes instead of transistors in a walkman.
Yeah, tiny tubes do exist, I've considered playing with them before. I would imagine they have quiet the expertise as they are one of the few countries still making them.
@@seanwatts8342 It’s very funny when someone evaluates those things that are judged by propaganda. microchip production exists in Russia, and they cannot be replaced by vacuum tubes) vacuum tubes are produced because they are in demand on the audio market. There are still factories in Russia that supply vacuum tubes to the whole world. Besides, don’t you know that lamps are much more reliable than semiconductors in space? Do you think space communications satellites can do without vacuum tubes?
@@ratatoskr3109 Первая интегральная схема, произведенная в коммунистической стране, была произведена в Восточной Германии в 1984 году. Я инженер, и моя работа - знать эти вещи. Я знаю, это трудно понять, но многие вещи, о которых ты не знаешь, произошли еще до твоего рождения.
You referring to the PSU design of this amp ? It actually works really really well, I was surprised. When you use a doubler you can half your current potential, but in the case, the transformer is rated for a lot more than I need, and the caps total capacity is also much more than this circuit needs.
@DATT interesting. I'm just starting to get into tube's I'm usually a BJT guy mostly because of the high voltage tube's need it's just safer to play with BJT's but I'll eventually get my feet wet with tube's
@@SheikhN-bible-syndrome Oh, you might be interesting in low voltage triodes, like the 6C33C or there 6080. They are lower voltage tubes that are often used in output transformerless designs of similar topology as a BJT circuit.
It is highly probable the that tube is oscillating at RF frequencies. Perhaps in the FM band or higher. Be careful where you put your fingers. The somewhat - careless wiring can be a problem with parasitic oscillation. If you have a scope - connect a probe to a small loop of wire and probe around the circuits - an oscillation will probably present itself.
Yeah eh, I suppose if there is oscillation I can hear, then there is probably oscillation I can't hear and it's one reason why the "tone" of this tube sounds off.
@@DATT look I get it, you want to fool around and try shit,... but it is painfully obvious that your guitar playing is your talent - not electronics. You should be much more careful than you demonstrate, or you are going to hurt yourself.
@@mr1enrollment Ah no, I'm not a particularly good guitar player. I have' always specialized in the technical aspects of music. That said, I've never worked with radios. I've never really worked with anything outside of audio, that's my trade, I havent' needed to. So yeah, I admit there is much I don't know about electronics as a whole. But I am careful, and I do know tube amps. If I didn't I wouldn't have gotten this working at all, and probably would hurt myself, haha.
How many 12AX7s does one need to drive an output transformer. Buy a high current switch mode power supply for the heaters. Wire the AX7s in parallel. Could be fun. Can you get twenty watts?
Hmm, the switch mode PSU is actually not a bad idea. Having enough heater current to use more than one of these tubes was part of the problem. And to give you perspective, Marshall actually had several "1 Watt" amps a few years back, that used a single 12AU7 as an output. I think the AU7 was chosen not cause it was the target wattage but because it's design was more appropriate to drive and OT. So, I guess it would take 20 tubes to make 20 watts.
forget it :D You cant get any useful power from 12AX7s. Maybe 12AU7 some laughable 2-5W amplifier, in fact someone has built an amplifier made of EF86 final stage (interesting idea lol) but this is not sustainable in any means. 12BH7 or the JJ ECC99 would work wonders with an output transformer. They are in face used in interstage transformers to drive 300B triode grids or directly if you are up to some foolery.
@@adam207321 1W 12AU7 is exactly what I was thinking. I have plans to do a 1W amp build. Well, I already have a 1W amp, or it's putting out 2W using EL84's. It's jsut a weak design. 1 or 2W is louder than you think, so it'll be fun. Plan is to use a 6N6P however.
Hey, totally off topic, but have you ever heard of those made in Vietnam Serviceman "Fender Clone" Amps before? Sorry, I just was thinking, "hey, if anyone out there would know about these, theres a good chance it might be you" hah. Either way, I just found one for $50 with a full compliment of 4 vintage 5881's, and 5 vintage preamp tubes, point to point, big Iron, and it has a Vibrator channel lol. I made the dumb mistake to ask to try turn it on in the store, as no one knew it's current state of operation, and it basically passed no sound, before it proceeded to make a light show in some of the power amp tubes, so quickly turned it off. Hope the power tubes are okay still, but who knows. The Amp, incase you haven't heard of them, a lot of Servicemen in the Vietnam War apparently used to buy them, so it was dubbed "The Serviceman Amp", and Its definitely 50's/60's, or early 70's. Mine is called a "Bassman", but from the very little info out there on them, there was a Deluxe Reverb Model, and one other one, but I forget the name. Also, the only video out there that I saw, his looked the same, but the logo said Fenler, instead of Fender like mine lol. Anyway, I wanted to ask also, would you be down if I sent it out to you? I think it could make a cool video, and I could def pay you to do something cool with it. It looks like it's actually got an added hole for a preamp tube, so maybe someone was already trying to Mod/Work on it in the past.
Oh, no I've never heard of those. Interesting. I live in Northern Canada, so stuff like that I just hasn't made it up here. That said, I do do amp repair, but the cost of sending it to me would be astronomical.
@@DATT Hey! I'm actually in Vancouver brutherrrr! Yah, they look pretty cool, and I think it def has some potential to be something cool. There's hardly anything out there on them, and other than seeing a couple posts that apparently they were made in Phillipines, there was a few models(Bassman, Deluxe Reverb, and something else), and I saw one video where buddy had a Reverb model, it looked exactly the same on the outside anyway, except it said Fenler, instead of Fender like mine lol. Also, mine came from the estate of Dave Brand. Correction, I believe it just has 3 preamp tubes, not 5.
@@jamescassidy4045 Ah, bigger city on the west coast, yeah I could see you getting things that we would not. Four 5881 ? That's a 100w amp. What would you even want done with something like that, other than to just have it fixed?
@@DATT Hey! yah for sure. It's totally that, but also just kind of lucky, because it came from David Brand's estate, and there's all sorts of weird rare amp's from his collection there right now including a Piper Amp that Gar Gilles made, and it sounds frieken phenomenal. I'm trying to get it. So yeah, its four 5881's, so 100w I believe. That said, there obv won't be a schematic lol, but it's all hand wired, and point to point I believe, so should be nice to work on. I can also test the tubes to see if they are still good, because when i turned it on that day, buddy behind it said they made a bit of a light show, but they look okay. If I have to buy a quad of tubes that's fine too, but just hope they work, because these are really nice robust Japanese 5881's, so will suck if some/all are †øast. And yeah, other than fixing it, all I'd ask/want is for you to do your thing, and make it sound how you think would be cool. So whatever you want to do. The only possible request I'd have is to try make it have more gain if possible, and it has a preamp tube hole it looks like someone cut at one point, so maybe make use of that, and add an extra gain stage, but only if it's not a pain to do. Ive just always wanted a modded BF bassman kinda thing like Mike Ness, and something I could boost with an OD, and get that gained out Fender punk rock kinda thing going on, but that said I have no idea if the schematic is even following a Bassman lol, and I don't want it to be a pain in the ass for you, so an extra gain stage would just be a light request, but totally not necessary. Just want it working for the most part, and would want you to have some fun, and do whatever you think would be cool, and show off the Amp a bit on the channel if you want.
@@jamescassidy4045 Hmm, I guess that would depend on the circuit, if its like a Fender Blackface, more gain would be more trouble than it's worth, but if it was like a bassman, then you could cascade it easy. What's your budget tho ? Like seriously, it'd probably cost several hundreds just to move it round the country. I can't recall, is this a head or combo ?
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Is the first time I've seen someone doing to his chair the same that I've done to mine , they should design and sell chairs with the left armrest , or with the righ only for left players, don't you think ? 🙂
Haha, happy accident. Years ago I did sound at this bar, and I got that tall chair for sitting at the board. I drunk girl tried to sit on the arm rest and it broke off. Damaged it enough it wasn't even worth trying to fix back on.
Russia stayed with Tubes longer because of EMP effects from nuclear bombs, you have to harden electronics with shielding when using transistors and IC as the EMP effect can damage the junctions going S/C.Only Valves (tubes) can resist EMP without thick propper shielding casing.
1. Why you write 'russian' on 'soviet'? Don't you know it is different things? Can I call you an English man? =) 2. Did you notice, that ГУ-29 is Radio wave generator for n-meter range? (Oh, I see you know)
I was kind of playing on the term "The Russian Sleep Experiment". Is it offensive that I call these Russian ? I do believe I refer to them as soviet in general. I have some knowledge of the difference, but not well briefed. And yeah, I know these aren't suppose to be audio tubes, hence why I thought it was a fun idea.
@@DATT It is up to you. But russians are got very arrogant about this common mistake. This is one of their aggressive statement: all of exUSSR are ours including Ukraine.
@@spdroll Well, this is good to know. It's a bit late for me to change the language in this video, but I'll definitely, choose me wording more carefully moving forward. Thank you for the info !
Musos just do not fully understand electronics. Their terminology is suggestive and ignores plain physics. All those long wire connections to the tube are bound to give interesting results. How about matching the Anode impedance to the output transformer for a start.
Nah it sounded like it was sucking something out of it.. like it has a bronchitis cough.. lol. Man i got like 20 random tubes i got from an old hospital intercom / radio broadcasting booth that was being scrapped. Some said they were worth hundreds of dollars and were highly sought after for their sound and they’re obsolete.. at least from the 60’s or 70’s.. i got one thats the size of a 2 liter bottle thats an rca.. says its a megavoxx or something, paints came off over the years.. i have no idea how or any reason to use them. If you pay for postage ill bubble wrap em to ya..
Yeah, Tesla is old JJ I think, and GT is just a relabeling company. COuld of been anyway, but just culled for quality. The are many JJ tubes I like. Hell, that amp has 3 JJ preamps in it I found gave me the best distortion texture.
The generator double beam tetrode GU-32 was made in the USSR, not in Russia, the main production of this model was done by the Lviv Electric Lamp Plant “Iskra”, in Ukraine. It has been out of production for a long time, due to a number of shortcomings - noise, size, heating, and most importantly, it requires a lot of transformers. Well, who wants to pick their nose - Russia will be making similar retro garbage for a long time, stolen 829B from RCA.
![Stromae, Pomme - “Ma Meilleure Ennemie” (from Arcane Season 2) [Official Visualizer]](http://i.ytimg.com/vi/1F3OGIFnW1k/mqdefault.jpg)
If that amp uses a feedback resistor from the speaker output to somewhere before or in the phase splitter you may want to play around with the resistor value to vary the amount of negative feedback.
Oh and as others have mentioned, twisting the control grid wires together and separately the anode wires together will help balance and cancel the crap being radiated by the anode leads and cancel the crap being picked up by the control grid leads and help with killing stray oscillations. Heck may as well slap a 150pf or more or less capacitor between the control grids to snuff out parasitic oscillations until you get around to mounting things in a more dressed chassis.
And man thanks for doing this! This is awesome!!
Hmmm another reference to twisting. I usually avoid twisting audio wires.
I misread the text in the thumbnail: "russian LUBE experiment" (and in the background all those glass things and electrodes)
Now, I gonna have nightmares for weeks....
Ohhh boy !
You nailed the problem at the 19:40 mark. Twist heater wires, fit grid stop resistors and screen resistor right at the tube socket, and twist anode wires. I have chased way too many odd distortion faults in production amplifiers that came down to some combination of these things.
Not to mention the output transformer is most likely lightyears away from beeing correct for this tube.
Twist anode wires tho ? Twist them with what ?
This tube is the Russian pendant to the QQE 06/40 that was widely used in amplifiers for frequency domain multiplex phone lines over coaxial cables (analog) . The QQE is also used by HAMs to build short wave transmitters. I have used rhe QQE to build RF-generators for scientific applications and also tried its russian cousin, which worked just as well.
Oh, so there are examples of this type of tube being used for audio amplification.
It's equivalent is the RCA 829B.
I would like to recommend the 829 tube by RCA. It is the exact same tube. That Russian tube was an RCA design shared by the United States during world war II with the Russians. The nice thing is there is limited use for the tube so they even in new old stock American manufactured do not cost a lot.
Another more modern choice is the 5894. Those tubes make excellent audio power amplifiers. He should run class AB1 push-pull.
Hmm, I was aware of the 829 but that's an interesting tidbit of history right there, neat.
Very cool video.
I really liked it.
@@orjanwerner9696 Thanks !
I love doing this as well. There's 1000's of tubes designed for other uses that work as amplifiers. A tube doesn't have to be specifically made for audio usage to work as an amplifier. For instance the most popular audio tube in the world, the 12AX7, wasn't designed just for audio. It has many diversified applications such as multivibrators or oscillators in industrial control devices. Many different High-Mu Twin Triodes will work just the same. You may have to change socket types, rewire sockets, and change voltages, but they will do the job just as well. The 12AX7 was chosen for use in guitar amps mainly for standardization and availability, not necessarily because it sounds the best. Anyway, like you are doing, the spec sheet is the best way to ascertain whether or not a tube will work in your application. I'm always buying tube assortments, it's fun to experiment. And you may find your new unique tone!
Yeah I know I've messed with the preamps tubes a lot. I have 9A to 9AJ adapters that have let me stick alternative dual triodes into my guitar amps.
Wow this is literally my pos-soviet childhood dream coming true. I remember playing with those tubes at my grandfathers dacha and later when I started playing guitar and diving into electronics as a teenager when I visited my granddad I was always thinking - what if I could make an amplifier with this big weird cool-looking thing! But I couldn't due to my very limited knowledge. Thank you for bringing the good memories!
You're welcome !
how kewl.... I bet what you hear is those glass tubes are vibrating from the sound... there is your feedback.. aw you're good.
Microphonics, that can be an issue, not really here tho.
This was an excellent video that could have been several episodes with a bit more detail. Thank you!
I def have projects that become series. This one not so much.
I enjoyed the video, I'd be glad to see a follow-up with 2 gu-29s. Seems to me that you have a good idea on how to improve it with grid stop resistors, wiring etc. I've used soviet tubes for anything from Tesla coils to x-rays, good fun!
I put off posting this video for a long time to see if I would follow it up. You'll notice I list the date of when my videos are filmed. I have yet to do anything else with these tubes. I have a couple ideas, just, when, you know. It'll likely be a while yet.
@@DATT Ahh I see, fair enough. Well thanks for the reply I'll be looking forward to the next project regardless of whether or not it is relevant to this project!
The problem with these RF tubes is that they expect you to drive the controll grids positive against the cathode, which means it will draw grid current which means extra distortion. And thus the ugly sounds its making, The driver is literary running out of steam as the grids are driven positive.
HOWEVER, Fear no more, there is a solution, DO NOT BE AFRAID and hook that G2 into a UL tap or 400VDC. EXPECT youll need arround -60 or -80V to bias the tube, but then you get the power you desire.
The reason for the 250VDC G2 limit on these tubes is because they are meant to be driven into RF ranges where G2 will dissapate during operation a lot more power than in DC operation. And thus you can afford using the tube as I described. Though I think it would be beneficial to put a 1kOhm resistor in series with each of the G2s
The same problem applies with the GU50s. RF tubes, they say its limited to 200VG2 I say hook it up to 800V and see what happens in audio. I would not be afraid to go as far as pushing the pair of GU50s at 1kV with the screen grids UL tapped from an 8kOhm primary and drive it nuts into 120W or more (So you would likely need a grid signal equally high which is a problem with these tubes as their gain is kinda shit for audio ampliffication where you need long sustained currents (20kHz is still AC yes, but it does not hold a candle against the 200MHz this thing can do.
Hmm, I'm not sure I understand your first statement, but the second, I do notice a lot of tubes ask for a much lower G2 voltage, but amps with just give them the beans anyway.
If I understand what you're saying correctly, lowering the G2 as I did is one of the reasons for the lame tone ?
A 1k on the G2 is standard in all my tube amps. YOu think this 29 could handle like 700v on both the Anode and G2 ?
If the tube has separate cathodes, you can use two constant current cathode sources that will always keep the tube in balance regardless of tube age. Use a LM337 IC. for each cathode. Very simple to install or modify, Works great on my 50 yr old Heathkit stereo power amplifier. Adjust the current limiter to match the maximum plate dissipation. Will keep it very linear.
Yeah, that was one trick with this tube, a shared cathode.
@@DATT I thought so, like a 5894 tube, or 829a. yes, a common cathode.
nice,amazing what can be done with russian tech,great you explained every step
Thanks !
Your mouse/ms paint drawings are as good as my hand drawings. You’re quite the artist
Haha, sometimes my hand drawings aren't much better.
Ever since I saw Styro Pyro make a Tesla coil with a Russian GU-5B Triode tube I've wanted to see someone use some obnoxious large tube like out of a Radar system or something. This is super awesome, especially since you were getting a nice chug tone and not just playing boomer blues licks.
Oh yeah, that's a BIG power tube you've mentioned.
And yeah, I'm a metal play originally, I do a bit more of that bluesy stuff now, but it did/does annoy me how a lot of gear reviewers and testers don't do so with more aggressive tones.
@@DATT yeah it's crazy big, would probably be quite a project to make one work for audio haha. Metal and punk is all I know but I love tube amps and weird projects so your channel is right up my alley haha.
@@CryptToneMusic I think some of those massive tubes were still used for the longest time in broadcast cause they simply didn't make transistors that strong. Probably changed by now. But I know they were still using them, and making them in the 90's and early 2000's.
@@DATT thats pretty wild, I'm not sure but I think tubes were used in radar as well for longer than you would think. It's crazy to think of tubes and mostly analog circuitry used in jets that were possibly going past the sound barrier
@@CryptToneMusic Oh definitely, anything that needed to manage a lot of wattage. There is this other odd soviet tube that comes up from time to time, the 6C33c, it's about the same physical size as these, or at least they use the same socket, I read it was used in the MIG jets.
Cool video, might be worth building a new amp around these tubes if you want to pursue it further, and voice the preamp to get the desired sound with these tubes.
I recall DAR amps building a few different designs using oddball russian tubes, before disappearing off the face of the earth about 10 years ago. From memory I think some even had no output transformer because the tubes used had a low enough output impedance to drive a speaker directly.
Hah, I can't see building a whole amp jsut for these tubes, but I can see eventually retro fitting them into the right amp. I have some ideas.
Yeah, DAR was using the 6C33C, which is a lower voltage tube, setting the circuit up like a solid state transistor circuit let them run the speaker directly cause the voltages and current they operated at were close to the voltages and currents speakers run at.
By your description I can tell you it is able to do anything , as it is an amplifier in your radio too .
By my description ? It clearly can be an amplifier. There are examples of people who have built amps using it.
@@DATT this tube you experimented with is a two stage system . Two in one envelope . Um , and you say it came from a video system ? 😎 cool ! You can’t argue with that .
@@jamesbeemer7855 At the end of the day, I did it for the lols. Some of the comments are taking it a bit to serious, haha.
I built a guitar amp using a pair of Russian GK71s. Very nice 250 Watts RMS. Lots of feedback and 1800 plate volts.
Oh wow, I looked it up, that tube is an absolute unit !
Waiting room for second video!
It'll be a while, I havent' even filmed one yet, and I got soo many projects stacked up already.
This is a high frequency tube. Put the resistors in series, in the circuit of the first grids. As close to the tube as possible. Against excitation at high frequencies
Yeah, lack of grid stoppers I figure was the problem.
@@DATT I don"t know what they are called in English. But with such wires, generation may appear
@@zubrzubr6769 Yeah, I kind of figured that out at some point. Sucks I didn't think of it in the video.
I use those tubes to build space robots from outer space. Nice video!
They certainly look like it, thanks!
@@DATT I can't share a link, but if you search social media you will find something interesting. Space_Robots_from_Outer_Space
@@VeryFungi Ohhh "Jim Frye’s Artistic Robots" ?
@@DATT lol space_robots_from_outer_space
@@DATT #Space_Robots_from_Outer_Space_Jam
Спасибо вам я увидел незадукоментированое применение лампы гу 29 для передатчиков в низких частотах)) 😅
Ха-ха, пожалуйста
this reminds me of the rare af DAR Amplification guitar amps like the Tuzia and FBM100, they used same or similar large tubes and they sound great. too bad they couldn't be made reliable enough with all the heat they put out.
Ohh, Looks like the FBM uses the 6C33C. Those actually use the same socket as this tube.
Yeah, the 6C33 is a lower voltage, thus a higher current tube to get the same wattage. I imagine it could run pretty hot. I've always wanted to play with the 6C33, but having to redesign an amp to run at a much lower voltage seemed like more work than I cared for. They often don't even have output transformers cause they can operate at speaker voltages, and the circuits will be a lot like a SS transistor Push-Pull.
@DATT maybe you should try making the most basic bespoke amp from a parts bin, because those amps did have some fucking MEAT in their tone. ive lusted after that sound since i heard it and watching someone try and build something would be great and significantly cheaper than spending $7 to 10k on a rather temperamental NAMM queen.
@@KrispieKomrad Ohh, bespoke basic parts amp. I did. I think, if I understand you correctly. Try the Oddball kit amp.
ruclips.net/p/PLr1eiFOCdnl8g4NpyBalve_b4wejnNlxF
I love jet city 100 watt! and theres nothing wrong with a good sovtek. I do enjoy my groovetubes though 😁
Groove Tubes are just relabeled other tube. Could be Sovtek. I do really like playing with tubes.
I find this amp can really roar with EL34's or JJ 6CA7's.
Perhaps you will like the ГУ-50 better. A thousand years ago, when I was young, in the USSR, we used exactly these.
By the way, ГУ-50 can be used with a radiator.
A radiator ?
I have considered the 50, it seems a more standard type of tube.
@@DATT The GU-50 has a flat aluminum frame on top. An aluminum finned radiator can be screwed to it in the center. Those used in the old days did not have a fan or thermal paste, but significantly eased the temperature regime when working at maximum power.
@@АндрейНикитенко-ф4с Ohhh, we'd call that a "heatsink" where I'm from. Hah, that' cool, literally.
Traynor, a Canadian amp maker had these amps that would deliver more wattage then spec, and they put fans in the amp to keep them cool, otherwise, you could blow them.
Double Tetrode GU29 is desingned for Vhf RF power reverse tacted amplifiers run up to 400Mhz
And you will really amplify Audio Signals!
Good luck with self oscillating generating and stressing the Neigbours Radios😉
Well, I ain't broadcasting, so I think it was completely localized, hah.
A bit confused! That thing looks like it could power a small rocket...😂👍🇨🇦
"Big Bottle" rocket.
That tube looks very very similar to a US standard tube the, 829b. I suspect it is a pretty close copy. It was designed for transmitters at up to a couple of hundred megahertz, maybe outputting up to 100 watts.
Ahh yes, the 829 sounds familiar. I think it is an equivalent if I recall correctly.
I know this is a high FQ transmitting tube, I find it hard to believe you could get a 100w out of it alone, but then, I don't really know much about TX amps.
@@DATT There are two styles of tube ratings CCS--Constant Commercial Service and ICAS--Intermittent Commercial and Amateur Service. There was quite a difference in maximum power levels. I able to easily find it online. Max power input for CCS was 60 watts, 90 watts ICAS, without forced air cooling, somewhat more with.
@@mikemcguire1160 Hmm, interesting info. I did notice the data sheet listed 2 output levels based on desired tube life.
One can buy 300v switch mode power supplies. You could put the outputs of two in series, or, three!
Oh maybe, don't think I need that tho.
maybe with the second GU-29 you might be able to get the mids to sound better? Not really sure if I understand how it works tho :) very interesting videos you have though, always fun to watch :)
After this I'm not particularly inspired to do anything with these tubes. I have an idea, It wouldn't really demonstrate the mids however.
You playing rock on Soviet tube, not it is Soviet Rock! ✊
But the vacuum inside the tube is "Soviet")). (the joke of radio amateurs about the "capitalist and socialist vacuum" in tubes of the same type is better)))
Hah !
200 odds volt on a breadboard funkey! Like the idea but Anode load should be different than 6L6-GC.
200 out, 480v in !
very nice old multimiter
The Fluke ? Yeah.
I go shopping around for a new meter one day, I found that used in the classifieds.
It worked well enough I just use it.
GU-29 is used in radio transceivers usually. I’m not sure if it is a good idea to used it in audio amplifier.
Well, that was part of the experiment. Just kind of for fun.
GU-50 sound very good, I bet these can too! Nice experiment! Dam Russkies, I love 'em so much!
Soviet Union was more than Russia. About 15 times more.
GU50 does internally resemble a more conventional audio tube, just in a really funny package.
@@uis246and how these remaining 14 parts that you clame not russia are doing?
@@IgorMuravyov-o5r some are doing good, some got potato dictator, some have to fight Pu's bullshit, some just live life. And I think all of them pay shool teachers more that Russia does.
@@uis246 keep pretending that you are describing the reality with a straight face, its OK, just calm down and get back to your gender studies.
What is the difference between a audio beam power tube and an RF beam powered tube? Depending on the frequencies you want to run not a lot. They tried to keep the input capacitance to the grids lower but that's about it.
Kind of figured there wasn't that big a diff.
as u already know thats os-killation
way too long leads, no stopper resistors, had the same with hitachi based diy mosfet amps , would be very interesting to scope it as is just to see how severe it is
got the same thing going on with a diy tube tester i built, fine for 12au7s ect but as soon as i jam in something beefy like el34 gauges flick all over the place the moment i draw some current, yet to get round to that
Yeah, I didn't realize it at the time. But it was obvious to be in editing. This vid could of been a lot different.
I was recently working on an old Traynor head that when unstable after I changed out the Output transformer. It took me to damn long to realize it was just the layout but the grid stoppers too far from the actual tubes.
High end audio would be more interesting. But this is groovy.
Yeah, that's a rabbit hole I've stayed away from. Couldn't even afford to get started in that.
I tend to be a simple man when it comes to audio. I have standard, but usually a good receiver and a nice pair of speakers will do. I got these tall vintage Mirage's up in my living room that were suppose to be pretty high end back in the early 80s.
I’ve heard a gu-29 in push-pull configuration. I can’t remember exactly what it sounded like but I don’t remember hearing anything bad like you’re experiencing
The bad noises, yeah, I'm pretty sure it's a skill issue on my part.
Wow, I'm not surprised they're so unbalanced. The datasheet says for a fixed voltage, the anode current can be anywhere from 38 to 85mA. I think that'd be per section. The instability sounds like parasitic oscillation so maybe check the output on an oscilloscope. It might be more stable with some capacitors wired from screen to cathode on the tube socket. Looking forward to more!
Oh it was def parasitic oscillation. It's like a knew it at the time, but I didn't know what to do about it. In editing I'm sitting here like "Bud, all you needed to do was put some resistors on the control grids at the socket, and it'd probably solved most the issues.
you just gotta build an amp around it. First much less gain hitting those grids, I would say maybe like a 6SJ7 and use a 6SN7 for the P.I. if you need another gain stage use a single triode like a 6J5 or if you need more gain a 6SQ7 with the diodes grounded or a 6F5.This is only an educated guess though. When I first started building amps from scratch and designing circuits I always used too much/many gain stages, sometime less is more, you can get a nice somewhat clean powerful tone and add a pedal to hit the front end how you want. Maybe try a grid stopper resistor.
Those are all very exotic tubes for a grinding guitar amp. And I really don't know that there is much gain hitting the tubes, you're not hearing a cranked amp tone really. It's a metal voiced amp with a lot of distortion texture generated in the preamp.
@@DATT You just made my point for me, a metal voiced amp with a lot of distortion texture generated in the preamp, that is excatly what I was saying, I believe there is excessive gain in the preamp. I have been building amps for a long time and I learned that lesson early on. I would have to look at the schematic though and I have no experience with that power tube. What I mean is the same preamp that sounds fantastic with a pair of 6V6s will hit the grid of EL84's too hard, you have to bias EL84's differently as well as add large grid stoppers to get similar results. Anyway, I think it is cool that you experiment with weird tubes, I have always done so, there are damper tubes which can be used as rectifiers, and horizontal deflection amps which make killer power tubes etc. Cheers and experiment away.
@@skullheadwater9839 Looks up the schematic for a Soldano SLO, that's what this amp is based on. It's deliberately designed to have the sound of excessive gain. How ever, these amps work by just a series of clipping stages. SO for the most part, it suppose to sound this way and it's not actually hitting the tubes with that gain.
Mind you, I'm now wondering if you're refering to the blocking distortion I was getting that made it sound like farty and compressed at one point, which yeah, that is a product is hitting the power tube too hard. I guess there could be more tweeks that need to be done to run these properly, like updated grid stop values.
Similar to an RCA829 RF amp tube. Most likely a Soviet copy!
Pretty sure it is. Some other comments suggested it was the product of the US sharing tube designs with the Soviets round ww2ish.
This is not a voltage regulator. This is active ripple filter.
Hah, it's both. I know what you mean tho, the output voltage will change proportional to the input voltage, which is not technically a regulator, but it fine for this application. Basically an adjustable high wattage dropping resistor. But yeah, filtering ripple is another effect it'll have.
Question: what is the output transformers primary impedance, and what is the load impedance called for on the tubes data sheet… how well are you matched there?
I’m glad you are doing here what I had thought about doing a month ago… granted I didn’t have a particular tube in mind.
Funny that you mentioned rob robinette… my idea was to build something like the 20 or 40 watt nakked amp he has got on there with an oddball tube… or do some further experimentation with other oddball tubes to see what sounds best.
I really want to make a 1x12” 20 watt combo version of the SLO clone. It is just too loud to play in the house, and it really opens up at the point of disturbing the neighborhood.
Not sure why I asked the primary impedance… usually it’s 4.4k for a 50 watt slo. I need a nap 😂
Funny thing I'm not using an SLO transformer, I'm using an aftermarket replacement Hammond for a Fender "The Twin". 100w rated 2.35k, but "overloading" the secondary to use it as a 50w transformer, so 4.7k ?
I have a video about it in my "Jet City Violence" playlist, where I replace the transformer in this head, and compare it against a couple others.
40Watts on two anodes. В оригинале - мощность, длительно рассеиваемая анодами 40 Ватт
So 40 watts total ? 20Watts each anode ? Итого 40 Вт? 20 Вт каждый анод?
@@DATT Yes.
@@zubrzubr6769 I thought so, thanks for the confirmation.
What Rock did you crawl out from under, 6146, 807 ETC were all used in both Audio and RF Amps as were many others. The Soviet tubes became very popular after the US Stopped manufacture of Tubes or Valves as the Brits like to call them. the Russian tubes were not bad at all, in fact some were much more rugged than the North American equivalent. Think of the terrain they have and this will give you a start, then there is their lack of skilled technicians. The Canadians used the Russian Tubes in their tube gear the they could no longer acquire North American tubes. the Soviet tubes are reliable if nothing else.
Hah, the rock I was under only had guitar amps that used common current tubes.
There still exists tube substitution manuals. I does take a while to find. there is a market for tube Power Amplifiers and maintaining them is becoming an art. Plus there are those who believe the spectral purity of the Tube/Valve Power Amplifier is superior to the equivalent solid state Power Amplifier
@@courierdog1941 Spectral, haha, is there a reason you chose that word ? Seems fitting.
tube is kind of like a Sylvania 5894
Hmm, yeah, looks like it from the Datasheet.
What a soud quality check do you with an audio signal purposedly distorted?? On my phone spunded bad. Make the check with nearly sin wave signal and a high efficiency horn speaker cabinet.
It's a metal guitar amp, the sound of the tube at full playing distortion is the only thing that matters.
And amp of the nature can't even really do a proper clean tone.
But yeah, my recording of that sound is not the best. Also, You can't really tell the sound of something from a recording, especially not listening on a phone.
If you want to be good with fistortioms, then take a MOS amplifier coping with at least 500 kHz linear power output (f. ex. 300W), and drive with any signal you want. Bee careful it will blow the speaker and your ears because of too much and powerful high frequencies.
awesome määän! ❤
Thanks !
2 x fixed bias circuit will work
What do you mean ? Like resistors on the cathodes instead of negative voltage on the control grids ?
у тебя приведенное сопротивление нагрузки отличается и перемотать выходной трансформатор было бы не плохо, но наверное для гитарного усилителя и так сойдет. =)
Да, с трансформатором все в порядке, мне просто нужна более чистая установка.
What you have there is a clone of the RCA 829B, designed to function as a push-pull VHF amplifier. I have a bunch, brand new RCA's. Want some? (Who am I? Retired RF engineer mid 60's..Been in RF since '70) Thousand of tubes in my collection. Maybe you guitar gods would like some 4-1000's, 4cx35000c, etc! LOL! 833a's?? 810's, 805.s 813's! I'd use the 813's myself for audio application. Matter of fact back in the 50's drive in's would use the 813 tube for audio. >700watts! AB1!
Damn, and here I am thinking of scaling one of my 100w heads down to 50w. I dont' even know what to do with that much power, hahaha.
стабилитрон необходим чтобы полевой транзистор не вышел из строя, оптимальное его напряжение до 10-12вольт
Это было мое предположение. Этот полевой транзистор говорит максимум 16 В.
@@DATT , если напряжение истока не может расти, не поспевает за напряжением затвора, по разным причинам, например емкость нагрузки высокая или нагрузка слишком большая, или короткое замыкание на нагрузке, то потенциал между затвором и истоком может стать опасно высоким, если оно станет выше 12 вольт (для большинства полевых транзисторов) то произойдет пробой диэлектрика затвора, и транзистор сгорит. затвор-сток станет короткозамкнутым навсегда(так можно узнать как полевой транзистор сломался). для этого и нужен стабилитрон. есть полевые транзисторы со встроенным супрессором между затвором и истоком, но это не одно и тоже, ток такого супрессора очень маленький, как правело до одного миллиампера, поэтому в подобных схемах, когда нагрузка в истоке, необходимо включать в схему защитный стабилитрон.
@@МихаилАбрамов-п7л Yeah, I guess FET's being as small as they are, it might not take much to overcome their internal isolation.
I like, sounds gig worthy
Hopefully it's an Italian gig, cause I'll be loading in Spaghetti.
GU-50 Mister !!!
What about it ?
I remember in the early 90’s there were big pedals billed as having Soviet tubes in them and thus giving them a unique sound. I forget what they were called but they played up on the Soviet aesthetic. Pretty clever way to capitalize on communism.😂
Sovtek maybe? :)
@@ihascupquake100 Yeah- that’s it! The early ones looked like Russian shoe mines or Geiger counters…. Just drab olive green boxes with a couple dials and a toggle switch. Thanks!
Sounds like the Big Muff Pi. They in particular didn't have tubes, just made by the same company that made tubes. I wonder if there are sovtek tube pedals out there. I might look that up later.
I heard that the Russians are still experts in vacuum tubes. The military preferred them because, unlike transistors, a vacuum tube easily survives the electromagnetic pulse of a nuclear strike. Transistors and microcircuits simply burn out. I have seen Russian homemade products on tiny vacuum tubes instead of transistors in a walkman.
Yeah, tiny tubes do exist, I've considered playing with them before.
I would imagine they have quiet the expertise as they are one of the few countries still making them.
The EMP story isn't necessarily wrong but truth is Russia never had any financial means to invest in IC manufacturing.
@@seanwatts8342 It’s very funny when someone evaluates those things that are judged by propaganda. microchip production exists in Russia, and they cannot be replaced by vacuum tubes) vacuum tubes are produced because they are in demand on the audio market. There are still factories in Russia that supply vacuum tubes to the whole world. Besides, don’t you know that lamps are much more reliable than semiconductors in space? Do you think space communications satellites can do without vacuum tubes?
@@seanwatts8342и где-же вы данный бред находите-то🤣...
@@ratatoskr3109 Первая интегральная схема, произведенная в коммунистической стране, была произведена в Восточной Германии в 1984 году. Я инженер, и моя работа - знать эти вещи. Я знаю, это трудно понять, но многие вещи, о которых ты не знаешь, произошли еще до твоего рождения.
Capacitor & diode voltage doublers suck at delivering current.
You referring to the PSU design of this amp ? It actually works really really well, I was surprised.
When you use a doubler you can half your current potential, but in the case, the transformer is rated for a lot more than I need, and the caps total capacity is also much more than this circuit needs.
so thats sond to me grad .
And yas it is hi end tube and i here that ,for a mattel gitar is the sond grad
I'm not sure I completely understand what you're saying, but thanks for watching !
It's a Russian tube,,- it has an "accent"
Hahaha ! Indeed they do.
Remind me of an fu 19 tube
Ohh, I think that tube is that same family. If I recall, I think this tube is also known as an FU29, which is the 19's bigger brother.
@DATT interesting. I'm just starting to get into tube's I'm usually a BJT guy mostly because of the high voltage tube's need it's just safer to play with BJT's but I'll eventually get my feet wet with tube's
@@SheikhN-bible-syndrome Oh, you might be interesting in low voltage triodes, like the 6C33C or there 6080. They are lower voltage tubes that are often used in output transformerless designs of similar topology as a BJT circuit.
so wat i mean is the sound is grad to me
yas fine tuning must be done .
BUT for matell i think is grad and wery power full .
i cam from germany .
Oh you like the sound ? OK. This isn't the best example.
I have other videos about metal amps that are better.
Tubes may be microphonic.
Ah, if it was that I would of figured that out.
It is highly probable the that tube is oscillating at RF frequencies. Perhaps in the FM band or higher. Be careful where you put your fingers. The somewhat - careless wiring can be a problem with parasitic oscillation. If you have a scope - connect a probe to a small loop of wire and probe around the circuits - an oscillation will probably present itself.
This tube operates in the Class C RF band and is not suitable for audio
Yeah eh, I suppose if there is oscillation I can hear, then there is probably oscillation I can't hear and it's one reason why the "tone" of this tube sounds off.
@@DATT look I get it, you want to fool around and try shit,... but it is painfully obvious that your guitar playing is your talent - not electronics. You should be much more careful than you demonstrate, or you are going to hurt yourself.
@@mr1enrollment Ah no, I'm not a particularly good guitar player. I have' always specialized in the technical aspects of music.
That said, I've never worked with radios. I've never really worked with anything outside of audio, that's my trade, I havent' needed to. So yeah, I admit there is much I don't know about electronics as a whole. But I am careful, and I do know tube amps. If I didn't I wouldn't have gotten this working at all, and probably would hurt myself, haha.
How many 12AX7s does one need to drive an output transformer. Buy a high current switch mode power supply for the heaters. Wire the AX7s in parallel. Could be fun. Can you get twenty watts?
Hmm, the switch mode PSU is actually not a bad idea. Having enough heater current to use more than one of these tubes was part of the problem.
And to give you perspective, Marshall actually had several "1 Watt" amps a few years back, that used a single 12AU7 as an output. I think the AU7 was chosen not cause it was the target wattage but because it's design was more appropriate to drive and OT.
So, I guess it would take 20 tubes to make 20 watts.
forget it :D You cant get any useful power from 12AX7s. Maybe 12AU7 some laughable 2-5W amplifier, in fact someone has built an amplifier made of EF86 final stage (interesting idea lol) but this is not sustainable in any means. 12BH7 or the JJ ECC99 would work wonders with an output transformer. They are in face used in interstage transformers to drive 300B triode grids or directly if you are up to some foolery.
@@adam207321 1W 12AU7 is exactly what I was thinking. I have plans to do a 1W amp build. Well, I already have a 1W amp, or it's putting out 2W using EL84's. It's jsut a weak design. 1 or 2W is louder than you think, so it'll be fun. Plan is to use a 6N6P however.
Hey, totally off topic, but have you ever heard of those made in Vietnam Serviceman "Fender Clone" Amps before? Sorry, I just was thinking, "hey, if anyone out there would know about these, theres a good chance it might be you" hah. Either way, I just found one for $50 with a full compliment of 4 vintage 5881's, and 5 vintage preamp tubes, point to point, big Iron, and it has a Vibrator channel lol. I made the dumb mistake to ask to try turn it on in the store, as no one knew it's current state of operation, and it basically passed no sound, before it proceeded to make a light show in some of the power amp tubes, so quickly turned it off. Hope the power tubes are okay still, but who knows.
The Amp, incase you haven't heard of them, a lot of Servicemen in the Vietnam War apparently used to buy them, so it was dubbed "The Serviceman Amp", and Its definitely 50's/60's, or early 70's. Mine is called a "Bassman", but from the very little info out there on them, there was a Deluxe Reverb Model, and one other one, but I forget the name. Also, the only video out there that I saw, his looked the same, but the logo said Fenler, instead of Fender like mine lol.
Anyway, I wanted to ask also, would you be down if I sent it out to you? I think it could make a cool video, and I could def pay you to do something cool with it. It looks like it's actually got an added hole for a preamp tube, so maybe someone was already trying to Mod/Work on it in the past.
Oh, no I've never heard of those. Interesting. I live in Northern Canada, so stuff like that I just hasn't made it up here. That said, I do do amp repair, but the cost of sending it to me would be astronomical.
@@DATT Hey! I'm actually in Vancouver brutherrrr!
Yah, they look pretty cool, and I think it def has some potential to be something cool. There's hardly anything out there on them, and other than seeing a couple posts that apparently they were made in Phillipines, there was a few models(Bassman, Deluxe Reverb, and something else), and I saw one video where buddy had a Reverb model, it looked exactly the same on the outside anyway, except it said Fenler, instead of Fender like mine lol. Also, mine came from the estate of Dave Brand. Correction, I believe it just has 3 preamp tubes, not 5.
@@jamescassidy4045 Ah, bigger city on the west coast, yeah I could see you getting things that we would not.
Four 5881 ? That's a 100w amp.
What would you even want done with something like that, other than to just have it fixed?
@@DATT Hey! yah for sure.
It's totally that, but also just kind of lucky, because it came from David Brand's estate, and there's all sorts of weird rare amp's from his collection there right now including a Piper Amp that Gar Gilles made, and it sounds frieken phenomenal. I'm trying to get it.
So yeah, its four 5881's, so 100w I believe.
That said, there obv won't be a schematic lol, but it's all hand wired, and point to point I believe, so should be nice to work on.
I can also test the tubes to see if they are still good, because when i turned it on that day, buddy behind it said they made a bit of a light show, but they look okay. If I have to buy a quad of tubes that's fine too, but just hope they work, because these are really nice robust Japanese 5881's, so will suck if some/all are †øast.
And yeah, other than fixing it, all I'd ask/want is for you to do your thing, and make it sound how you think would be cool. So whatever you want to do.
The only possible request I'd have is to try make it have more gain if possible, and it has a preamp tube hole it looks like someone cut at one point, so maybe make use of that, and add an extra gain stage, but only if it's not a pain to do. Ive just always wanted a modded BF bassman kinda thing like Mike Ness, and something I could boost with an OD, and get that gained out Fender punk rock kinda thing going on, but that said I have no idea if the schematic is even following a Bassman lol, and I don't want it to be a pain in the ass for you, so an extra gain stage would just be a light request, but totally not necessary.
Just want it working for the most part, and would want you to have some fun, and do whatever you think would be cool, and show off the Amp a bit on the channel if you want.
@@jamescassidy4045 Hmm, I guess that would depend on the circuit, if its like a Fender Blackface, more gain would be more trouble than it's worth, but if it was like a bassman, then you could cascade it easy.
What's your budget tho ? Like seriously, it'd probably cost several hundreds just to move it round the country.
I can't recall, is this a head or combo ?
"I want you know? I have listened to you, and had watched you carefully. You are very smart AND YOU KNOW YOUR FIELD OF INTEREST; I AM GLAD YOU WAS COMFORTABLE AND ACTED AS YOURSELF." KNOW THAT YOU HAVE FRIENDS ONLINE, SOME MAY JUST BE QUIET AND ONLY TALK AT Tmes."
Thanks man !
Is the first time I've seen someone doing to his chair the same that I've done to mine , they should design and sell chairs with the left armrest , or with the righ only for left players, don't you think ? 🙂
Haha, happy accident. Years ago I did sound at this bar, and I got that tall chair for sitting at the board. I drunk girl tried to sit on the arm rest and it broke off. Damaged it enough it wasn't even worth trying to fix back on.
It us not ruzzian. It is Soviet
I was playing on the term "The Russian Sleep Experiment". I do generally refer to them as Soviet tubes.
I mean no offense.
Actually, you mean 829B.
This is a Soviet equiv/copy of the 829B.
Scoop that other tube and glue it in, too !! Rock On Sir! Its very fun watching you build! 🙏🚂🎼🌹🎵🎶⚕️~C< 3)>>-Z->}
Thanks !
Noisey?
Pot the pickups.
Hah, my pickups are good.
Ты думаешь эта лампочка что-то может сделать? А как тебе лампа в метр высотой и с водяным охлаждением?
Это похоже на серьезную лампочку!
guy does wants to get shocked. here and there taps anodes covers, tube glass itself. forgot about a sense of safety
I'm more careful than I seem, but I do admit I'm entirely too comfortable working on tube amps.
Omg GU29 looks like Soviet vodka bottle 🍾.. I think it works better with russian balalaika 🪕
It's possible the Gu29 can hold vodka better than the balalaika, hah
Russia stayed with Tubes longer because of EMP effects from nuclear bombs, you have to harden electronics with shielding when using transistors and IC as the EMP effect can damage the junctions going S/C.Only Valves (tubes) can resist EMP without thick propper shielding casing.
Vacuum tubes are still used for communication satellites today. they are much more reliable than transistors in conditions of cosmic radiation
Damn, tubes in space! That's cool as frig.
10k views john connor :o
I know right, I did not expect that of this video.
@@DATT it's well deserved, your vid should be more known
zamzam water
The what now ?
you need antena
Hah, broadcast shredding guitar.
Antichug.
👍
1. Why you write 'russian' on 'soviet'? Don't you know it is different things? Can I call you an English man? =)
2. Did you notice, that ГУ-29 is Radio wave generator for n-meter range? (Oh, I see you know)
I was kind of playing on the term "The Russian Sleep Experiment".
Is it offensive that I call these Russian ?
I do believe I refer to them as soviet in general.
I have some knowledge of the difference, but not well briefed.
And yeah, I know these aren't suppose to be audio tubes, hence why I thought it was a fun idea.
@@DATT It is up to you. But russians are got very arrogant about this common mistake. This is one of their aggressive statement: all of exUSSR are ours including Ukraine.
@@spdroll Well, this is good to know. It's a bit late for me to change the language in this video, but I'll definitely, choose me wording more carefully moving forward. Thank you for the info !
Musos just do not fully understand electronics. Their terminology is suggestive and ignores plain physics. All those long wire connections to the tube are bound to give interesting results. How about matching the Anode impedance to the output transformer for a start.
Oh yeah, the long leads did not help, hah, and I didn't think to change the plate load until later.
Nah it sounded like it was sucking something out of it.. like it has a bronchitis cough.. lol. Man i got like 20 random tubes i got from an old hospital intercom / radio broadcasting booth that was being scrapped. Some said they were worth hundreds of dollars and were highly sought after for their sound and they’re obsolete.. at least from the 60’s or 70’s.. i got one thats the size of a 2 liter bottle thats an rca.. says its a megavoxx or something, paints came off over the years.. i have no idea how or any reason to use them. If you pay for postage ill bubble wrap em to ya..
I admit, it's a tempting offer.
Tesla tubes and groove tubes ruled!!!!!
JJ sucks generic pumped offa line with least expense
At just within operational specs
Yeah, Tesla is old JJ I think, and GT is just a relabeling company. COuld of been anyway, but just culled for quality.
The are many JJ tubes I like. Hell, that amp has 3 JJ preamps in it I found gave me the best distortion texture.
My friend it is not if,it is sign of micro, correct your self before teaching others.
Oh I'm not teaching anyone. This is just a guy in his shop, trying something to see what happens, hopefully it entertains.
The generator double beam tetrode GU-32 was made in the USSR, not in Russia, the main production of this model was done by the Lviv Electric Lamp Plant “Iskra”, in Ukraine.
It has been out of production for a long time, due to a number of shortcomings - noise, size, heating, and most importantly, it requires a lot of transformers.
Well, who wants to pick their nose - Russia will be making similar retro garbage for a long time, stolen 829B from RCA.
Yeah, that's just the title I went with, as a pun reference. Many have pointed that out at this point.
Busy beezy😅😅😅 very quzzy😅😅😅pro🎉🎉🎉
Buzzy beez
Talk talk talk, what for is the hat?
It's my thinking cap