Видео

Young Timothy Gonzalez Lisa Thompson Amy

It`s almost funny - I fixed one up in the past, and guess what was wrong? A lot of broken Tantalum capacitors on the -15V rail, and a shot rectifier :) Seems there is a seesaw effect in these: some capacitor dies on some rail, damages the rectifier, damaged rectifier overheats more capacitors with high ripple....

Nice work, really liked the analogue approach. Quite useful to learn the basics functioning of PLL in practice.

Well done.

Great video with pretty easy to understand explaination! 24:55 Of course I want a video about the cute f2V converter :-) 43:50 I would say that that's pretty amazing (8 times to be exact) :-D Also can't wait for all the other videos you said you have to make ;-)

❤

Late to the party 5/24. Ali-Ex had the TC-1 (looks the same) on sale too cheap to pass up this time....The Best review/ best explanation of any I've seen. I need not check any more. Two Thumbs up!

Great video! I don’t really work on these types of circuits but understand the terminology so I enjoyed your clear explanations. I use a simple 2235A and thought it might be similar but yours is a/d - I’ll have to look for that! Also, in the states that Fix-x is called “correction fluid” or “White-out” ;)

Mag kano po yan ser

NoScopeNoFun can't I also use a HiZ AC milliVoltmeter? I know it's less fun....but....

Great explanation, I have just worked with small jfets and I can see is almost the same way to bias a tube amp. I must ask, why did you choose exactly1,2mA 36mA for anodes bias?. I can see the mA values are not exactly at the middle of the graph which I always thought would be the best point to bias a jfet / tube.

I would like to see you video the build of this amp Great Video

Really good video with excellent explanation

My poly caps. The rust colored radil generic ones are all testing 10 ohm esr. Confusing

thank you for all the calculations.. i had been wondering how the values of the semiconductors are determined..

Excellent, thank you.

🙏🙏🌹🌹🌹🌹

Mine doesnt turn on

Transistor tester

Your excitement is infectious Very COoL. Good job! Love hearing your "circuit analysis".. This is a nice scope - A/D? I didn't realize that Tektronix had one of these. It sounds like a must-buy. Way more InTeReStiNg than your typical Rigol scopes. You truly have a appreciation for these classic scopes. Who wouldn't want to SUB? p.s. And you explained it all in a 2nd language, AMAZING. Cheers from So.CA.USA 3rd House On the Left

Awesome video thanks I have a 420. It has a stuttering lights flashing on then off fan start and stop at start up issue. When I first got it I rebuilt the one large power supply board actually just new caps. It ran fine for a couple months now this. I'll watch your recap video I guess that's my next step. Love your enthusiasm

Fine repair, watch those (ROE?) brown plastic electrolytics, they gave problems in TVs.

Does this meter work on SMD component board, to find any sort of Leakage / Shortage etc. also?

Great video! Please, can somebody tell me the value of the resistor used in series? Thanks in advance.

Thank you. This is very helpful, as my main interest is tube guitar amps. 😊❤️

Of by the way you where getting distortion because you did not match the ECL82 to the output. Ideal is an 8ohm speaker and transformer though you can also use down to 5 with some component adjustment. Will have to watch the next video to see what you did to fix this.

Well nothing special about the ECL86 it is a simple triode-pentode there where more than 30 tubes of this type in the day. They where used in almost every record player that was coming out of EU land in the late 50s and 60s so I guess the really special part is they are very cheap an quite easy to pick up as NOS. They do produce good sound and I have I worked with them myself the only problem I see with them they really only work with older crystal head turntables that put out a a higher voltage than the 100~300mv from a electromagnetic head. I did try and make a guitar amp but again not enough gain from the single Triode to make it a viable project. Good job on explaining how to compute grid voltage that is the way it was originally computed and was just common knowledge of the day now mostly lost, Thankfully an old RF engineer from my radio club explained this method too me ;) Many of the so called modern 'Tube' experts get it 100 wrong.

The circuit doesn't look right I would take the feedback from the output side of the transformer to give extra compensation of transformer distortion

Vowe 👏👍Awesome.

I BOUGHT IT. IT"S SO FUCKING SATISFYING. TO BE ABLE TO MEASURE TRANSISTOR WITH EASE

cool video Why didn't you use an Armstrong / Meissner oscillator, since its much simpler?

Glad I found you, this is the best explanation for finding out this hidden side to capacitors and why it matters on unmarked components I have come across. I have subscribed and will now watch all your videos. I do hope you manage to keep this channel going even if it is infrequently, there may be lot's of electronic channels but you have a way of explaining things in a very understandable manner which is much appreciated by me and others too. 💐🤔♥️🧀🐈‍⬛😼🌈🏳️‍⚧️🏳️‍🌈🇮🇱🇵🇸🇺🇦🇪🇺💐

€23, ya got robbed

very beautiful osc. I have the 475, but love the digitizer opt.

😂😂😂😂😂😂😂

Excellent. Thank you so much. I've been looking for someone, anyone, to explain these portions of the typical tape player/recorder circuit. Thank you very much for sharing your knowledge!

I build open loop single ended triode amplifiers. I limit the tubes to the most linear part of their response curve. That is how i manage THD. While nfb reduces thd, it also phase shifts it. That can produce a less pleasant sound.

You have another little issue. The transformer you are using does not have a gap in the core. That will cause it to saturate at low frequencies. Your explanation of the circuit is well done.

You would get better base response if you added a bypass capacitor to the triode cathode resister.

Very nice, thank you for helping me understand the design of a simple single tube amp using this very interesting ECL86 tube! I am thinking of using this tube to design and build a headphone amplifier. Question: For amps using an output transformer for speakers, would upgrading the quality of the transformer produce a better frequency response so negative feedback (or less feedback) wouldn't be required?

Excellent video, I love the detail and your explanation on how the circuits work, I've been an engineer since 1980 and it's refreshing to re visit some of these circuits since I have forgotten some, and I'm also a Tektronix junkie.

Ah the ECL86, a classic tube used in many things from TVs to Tape recorders etc. I would say the values for this circuit are so general I already knew every value you calculated in my head. I would however say you don´t want to go higher than 470K on the input especially when using modern audio sources with it as it will introduce distorsion and stuff pretty easy on many devices plus increase noise level etc otherwise so it was a good pick. I would probably use a bypass capacitor on the first stage cathode too when using a single stage pre-amp to increase gain and response in lower end, you can actually substitute the grid resistor and cap all together on the triode and use a LED of your choice to bias the tube, as the voltage drop is constant you bias the tube to the LED voltage drop but won´t limit the current as a LED act like a diode when it conduct and you don´t lose gain because of it. and as you say negative feedback is good to control the sharp high end as well, I always put a 12K resistor in series with a 100K pot for the feedback to make it adjustable. but I would not combine negative feedback with LED Bias though. but I often include a 100-500K pot in series with a 0,1-1uf capacitor to ground to the grid side of the second stage in your case pentode grid, this gives you a nifty tone control that can depending on the cap size cut higher end sound gain and still keep the bass in the bottom for a much more balanced sound, and I likely use a 220K resistor to ground together with that pentode grid too. in many designs it was often a small value capacitor in parallell of the primary winding on the output transformer, this cap cuts high end sound by filtering it out from the transformer completely if you so desire

The magic of NFB .hiding the problems on the bench and ruining the music ....

Thank you so much!

Amazing!

Really great explanation thank you. I think we should not trust a marked outer foil end, test them all when its critical is a good approach

Have the same Grundig generator,very fine piece of equipment

Thankyou

Hi I've got a 1084S-D1 coming my way. Works fine but may eventually need this fix - Question: Is the HR 7533 compatible for both the P1 and the D1 ? Thanks great vid.