How to Spot Super Rare 12AX7 Vacuum Tubes part I
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- Опубликовано: 17 сен 2024
- This short video briefly touches on some of the most famous and sought after 12AX7 NOS vintage tubes. Featured are the very rare Mullard longplates, Amperex Bugle Boy and longplates, Mazda silver plates, and the Telefunken line of smoothplates, selected tubes, and rib plates.
Brent is the most honest trustworthy man in this "Corrupt" "NOS" tube business. He is completely sincere and does all this with an absolute passion for tone! Thanks Brent, You are a good man!!!
Thanks, your comments and support are greatly appreciated. We guarantee what we sell and have probably the most liberal return policy in the business.
no way hat title goes to the oldguyradiola gang and the awesome ability to keep a perfect ebay score while everyone that interacts with customers acts like artie or ed or... check out the overlord tubes ad on yourube and then look up the ebay history on google... people fell for that bejwelled 90s mess.
@@l_shaun_bunds_l Old Guy Radiola (who were nice enough folks, but not very knowledgeable) sold their inventory to a completely clueless snob recording studio outfit called BangyBang. Check 'em out, you'll see...
Fat Willie Merlin moon... I know
I love it when I get equipment that has Telefunken, Amperex or Mullard tubes in them---if they test good, they go on ebay, and the audiophools will pay me a small fortune for them. In their place, I use quality American tubes, and they sound great.
I agree! In my system the Telefunken smooth plate 12AX7 is fabulous. Still have the original six in my 1964 Marantz 7c preamp that to this day drops the jaws of some of my fellow musicians when they come over and listen.
I have a dozen tested spares waiting to go into service when needed.
Thanks for the video, Bruce in South Carolina
Finally ! i got my answer!
I have some NOS Philips EL84's and ECC83's all with a blue tip.
I asked allot of people, nobody could tell me why they had a blue tip.
I've gotten them from my grandpa who passed away, I'm now 24 and yeah well i got the tube virus thanks to him
@@jordan390a Thanks, I wondered that myself...
Thanks so much for the time and effort you put into the video. Those of us who are here to learn something actually did! Keep up the good work. Repairing the old tube radios is a dying art. I am so glad someone cares enough to try and educate those who are interested in carrying on the craft.
InstaBlaster.
I bought a very old TV at a yard sale. Had about 12 tubes of various sorts. I'm now looking into a DIY headphone tube amp project for a tube labeled 12AU7A made in germany. Interesting stuff.
OK, listen up, youngsters...I've been in the tube game since 1961, and this is the truth: the best tube for your (audio) application is the one that sounds best to YOU, regardless of what any professional tube-roller might tell you. (Disclaimer: I'm a professional tube-roller - I specialize in guitar amps. I've done work for Derek Trucks, Meatloaf, Let's Go Bowling, Susan Tedeschi and many other top artists.) Sometimes tubes which test as excellent in a tube tester sound like ASS when installed in the equipment, because tube testers (for the most part) don't test for hum, noise or microphonics. By the same token, tubes which test poorly on a tester may well sound dynamite when plugged into a guitar amp. "Brand snobs" often get burned by selecting tubes by what's printed on the glass...just because a tube says "Telefunken" or "Sylvania" on it, it's no guarantee that what you've purchased isn't a turd under glass. The "legendary" tube manufacturers turned out crap as well as good stuff back in the day, so use your EARS when selecting tubes. If you can develop a relationship with a tube seller who is a musician as well as a technician, you'll have a greater likelihood of obtaining quality parts. Bear in mind that there is a whole universe of tubes which is circulating on e-bay; people buy them, try them, find out that they suck, and put them back on e-bay. Buying from someone with a good reputation may keep you from joining that particular dance. And don't rule out currently-produced tubes; some of them are damn good. Some aren't. ;-) Good luck!
Thanks for your experience.
I remember the red tipped telefunken tubes used in American Optical ECG monitors in the early 70's. Even though they were tested to very high standards, there were some that would not yield a good common mode rejection ratio in the low level stages of the monitor. That was the problem with tubes, and after a few weeks of operation, the CMRR sometimes needed to be readjusted because of aging of the dual triodes.
Preamp tubes do not require any bias adjustments to your amp. Obviously, consult your operations manual, dealer, or the manufacturer if in doubt about changing tubes, or any special precautions or additional steps that need to be taken when changing any tubes in your amp.
I have a pile of assorted tubes including some made by Westinghouse, still in the box, made here in the city I live in,.... Hamilton Ontario Canada
Wow, had no idea all this information existed for vintage tubes. Fascinating. Thanks for doing this video and your other videos.
I mentioned your comments to Eric Barbour of The Tube Collector Association, who also was a USA consultant for years to Svetlana and Vacuum Tube Valley, and he said "Didn't you read Vacuum Tube Valley magazine? For ten years, we performed
tests comparing NOS tubes to current production, and had no trouble
proving, again and again, that NOS audio tubes tended to have lower signal
distortion and better construction quality than the audio types
currently being
manufactured. With few exceptions."
I sell JJ, SED, and Groove Tubes for those who want them. They are all fairly good tubes. To my ears, Sylvania does indeed sound very similar to these brands. The difference I and many of my clients hear are with the premium brands like Telefunken, Mullard, Amperex, and Siemens. To a listener, it is simply Duke Ellington: "if it sounds good then it is good!"
I recently met a retired FAA engineer that sold me many tubes and there were two red tipped Bell & Howell 12AX7A and only marked Made In Japan.
Bell & Howell used Mtsushita of Japan for most of their tubes in the early 1970s. The red tips indicate they were likely tested and passed for critical applications in certain test equipment or hospital equipment.
I work at an electronic recycling plant, I was able to get a few hundred tubes out of there...but the world needs to know that electronic recycling we break working antiques all day long
Look out for a Willie Studer F 36/G 36 taperecorder,when you still work there.There is a beautiful build preamp/poweramp inside.I found one years ago,and inside there were 3 Telefunken ECC 803S inside.
I love the smooth plate...they always seem to be a step above the others....BUT...having any of these is better than what is out there for sale to the public!!
Yep, and the 7027A is VERY hard to find at all in NOS which is why the price is way up. The JJ are a good alternative. The small preamp tubes contribute more to the tone than do the 7027A tubes anyway. You can find good deals on NOS 12AX7 tubes, but some people want NOS tubes with "designer labels" and don't care about the price. That kind of sucks since it means my wholesale price keeps going up. The tube quality does not improve. And they get harder to find.
Very informative and I forgot about Tekefunkens other than the smooth plate versions. Surprised you didn't mention Tungsol 12AX7's or point out the different era Bugle Boys with different cartoon character on the tube. Glad to discover you're around!
Well that got me excited. I have a whole box of fisher, telefunken, amperex, and other brands of just 12ax7,12au7,12at7.
Well aren't you the lucky one.... Really they are all just old klunky tubes. Did ya see what he said about those old tubes gassing and losing vacuum?
You should really try and take them somewhere to trade for new JJ tubes. As a matter of fact I will make ya a great deal and trade ya 1 JJ for your old tubes. Just because I really think ya need new tubes...
Yeah those Fisher/Telefunken are the worst! Like I said, let me do y the favor of getting rid of them to me!
The point is that tube equipment used to cost the same in its time as transistor stuff costs now. And cheap tube equipment made 'back then' sounds better then cheap transistor equipment.
@orange70383 Rare tubes are still out there! Research the sales of various types, some tubes are in extremely high demand, and can be found cheap at yard sales!
I like the 2N3904, since it doesn't need a heater voltage.
Back 4 or 5 years ago i went to a flea market and i spotted a RCA repair box. I opened it up and there were well over 100 tubes in boxes. Some were marked as used and were for testing, but the majority were NOS RCA, GE and other brands. I bought the whole box of tubes for $40. I got home and tested the tubes and I also tried them in my amps and in the end i had 36 12ax7 tubes (New in box) RCA and GE tubes. 5 Amprex 12AX7s. 12 RCA 6L6 tubes, 11 12AU7 GE and Amprex tubes, 17 6V6 RCA. And there were almost 20 used tubes ranging from 12ax7, el84 (6bq5), 6L6 and a few that no guitar amps use. Was an awesome find. Im curious what just the red and black wood RCA repair box was worth. But I still have a majority of those tubes in my stockpile of tubes. About 7 years ago i bought 25-30 JJ 12ax7 tubes for $9.99 a peice and i have not used them they are still in boxes. JJ 6L6s, JJ EL84s. Now ive been using 6p14p in all my EL84 amps and ive been using 6n2p preamp tubes in everyone of my amps instead of 12ax7 tubes (either ive rewired my amps or im using the 6n2 adaptor to 12ax7. The 6n2p and 6p14p are dirt cheap for military grade NOS. Im also experimenting with 6p3s power tubes in some of my 6L6 based amps, ive just had to cool the bias down. But i can redo all the tubes for example in my Blues Jr for around $14. If i was using say JJ 12ax7 and JJ EL84 new production tubes itd be $125-150 to retube the amp ! Crazy. You can get 32 packs of 6n2p preamp tubes for around $65 shipped ! I keep telling people about how good these tubes are but some people until they hear my amps are trapped in this world of theres no way anything can be better than a 12ax7 tube ! All the companies use them !! lol Military Spec tubes last a hell of a lot longer than new production tubes. Ive been selling Recap/Conversion kits for Blues Jrs. In the kit are F&T caps, 27k resistor to cool the bias down and 3 6n2 to 12ax7 adaptors. 3 x 6n2p preamp tubes and 2 6p14p power tubes. Ive sold about 30 of these so far. The 6n2p preamp tubes im buying rival my 60's RCA tubes in tone.
Just a heads up folks, you heard it here first. Also look up Train Wreck amps they are one of the few companies using 6p14p and 6n2p preamp tubes and some other European tubes. You can wire your amp up to use these 6n2p preamp tubes very easily, but i found it was easier to just get the adaptors for people.
For 12ax7 tubes my personal favs (not counting 6n2p tubes) are RCA short or long and GE short or long plates from the 60's. In my Twin style amps these are the bomb and I never found out what type of tubes Jerry Garcia used, but i swear they were what im talking about here RCA or GE's ;-) . I know some people swear that they dont hear a difference between tubes and that may be true you dont hear it, but i do and if im playing thru the amp i want it to sound the way i like it to. See we agree to disagree haha 🙂
For example I like JJs but they are not always the best sounding tubes. But they last a long time in my amps (as long as the bias is set correctly on the amps). Mullards i do not like, ive had more dead current production Mullards in the past 7-8 year than any other brand. Sovtek are very hit or miss for me, some of their tubes sound great but ive ordered some matched pairs from a few reputable places and ive had issues with them in multiple amps with getting the bias right. Im speaking of their EL84 tubes tho, not their 12AX7 which i like. RCA i think are the perfect 12ax7 for what i do, same with GEs i love these two brands. But these are my picks for 12AX7 preamp tubes.
cleaning out my storage unit, came across a box with 11 Telefunken 12AX7 tubes, authentic to every detail, smooth plate with white letters 'Made in Western Germany'. I don't even recall exactly how i acquired them at least 7 years prior, I think they were going to be thrown away and i rescued them, not knowing at the time exactly what they were, other than vacuum tubes and my instinct said 'keep those, they are probably still useful' 11 in very good condition, one broken, and two more that are RCA and GE 12AX7 also. Looking up how to test them
Thanks for posting this, very informative for us tube geeks. :)
Thanks By post this video! I love old electronics experiments with electron tubes.
Glad I found a pair of NOS Telefunken tubes for 70 bucks recently. The smooth plate is balanced, but has high plate resistance, which is kind of annoying as a V1 that needs more 'oomph' put into it to get the gain, but the ribbed plate is fucking amazing, 70/70 instead of 120/120 according to the American testing machine.
Telefunkens are great tubes, I have them in some of my equipment.
the Millard over drive so warm in Marshall amps. vary musical warm mid tone.
There are some capacitive differences in the plate, grid, and cathodes of some tubes vs. the same type made by another manufacturer. And that ALONE determines how one tube can sound different from another of the same type but a different brand. Even then it's not the tube, but how that altered capacitance interacts with the amplifier's circuit. Between that and microphonic sensitivity, that pretty much defines all that ACTUALLY makes a difference in tubes of the same nominal type.
I got was emtied a house where i old schop keeper and a bit of a horder of things and i got a huge box of new old stock tubes,Philips miniwatt rca etc etc 6l6 many siemens and a bunch of black metall cappet tubes(minlitary grade?,Also got lots of old tube radios for different use.I does some repair on amps and electronics for 40 years, fun to get hold/save them from going in the trash continer.
I have a couple of Realistic Lifetime tubes, a 12AX7 and a 12AU7. They're both good.
True, NOS tubes can be failure prone just like new tubes. The testing that was done on professional equipment under controlled conditions, does show that NOS tubes display lower signal distortion and more accurate curves when plotted, than new tubes, if you want scientific evidence. Beyond that, I have 16 years of talking to clients who were skeptical at first, then heard the difference themselves that NOS tubes make. 10,000 clients and 1% wanted their money back due to "no sonic difference."
There is much evidence to support the quality of NOS tubes over new tubes. Vacuum Tube Valley a number of years ago did mass testing of NOS vs. new tubes, including sound quality, build quality, electrical stability, and found time and again the NOS tubes sounded better, performed better, and lasted longer than new production tubes. Since 1996 my clients overwhelmingly vote with their wallets for NOS tubes in their guitar amps, and confirm they sound better!
@Stereolist Thanks! I will try to get a sequel to this video up soon!
Vintage tubes are not a good thing as they will all eventually die being used or not (all tubes will)
What we need is for manufacturers to create improved new tubes...
A line of cold cathode, lower plate voltage tubes, could revolutionize audio electronics...seems we gave up on tube R&D when the transistor came along.
Craig Diamond there is a website online called thetubestore. com that sells new tubes. they sell an 12ax7 for like 14$
+forsakenworlddragons I think Craig was going for a new tube design in general... like not a 12ax7's, but an as-of-yet undeveloped tube design.
We haven't seen much since the mid 60's (because of the transistor).
SinSchism ah right. got ya.
"seems we gave up on tube R&D when the transistor came along." There's a good reason for that.
For crying out loud, we're talking about audio frequencies here. Any transistor will have gain and be flat over audio frequencies. When you're designing for hundreds of MHz, then you have some challenges.
Thanks, I may try running curve plots on NOS versus new tubes on the curve tracer and see how they match up at full rated power. It may prove interesting. NOS tubes can be prone to early failure and sonic problems due to gas, either caused by outgassing of internal parts or a compromise of the vacuum from slow leaks around the pins due to long storage. New tubes rarely have these issues. We have a satisfaction guarantee on our NOS tubes that covers these problems.
....I have 200 amperex 12AX7 tubes never knew they could be worth something
Wish you would do a video on 12ax7 tube codes. I see mostly mC1, F91 F92,I61, I63 in the Mullards.
No offense was taken, and I did not feel that was your issue at all. Thanks for the kudos. I have sent an answer to your Lord Valve tests. Made me think quite a bit about this stuff. Good mental workout. Thanks!
We obtain tubes from all over the world. Some in this video came from The Netherlands, and others came from Pennsylvania! We buy bulk lots of new old stock tubes all the time from many different sources.
This testing has been done. I refer you to back issues of Vacuum Tube Valley. Tests by qualified engineers using lab grade test equipment proved over and over, that measurable differences can be detected especially with regard to signal distortion, with NOS tubes usually being rated superior over new tubes. Not my words, but Eric Barbour's. He has over 30 years as an engineer in the industry, and consulted for Svetlana and Vacuum Tube Valley.
I think I've got some Amperex/RCA miniatures in a dead HP oscilloscope... I'll be checking it out!
Thank you for your presentation. Please post some others like 7591,GZ34, 12AU7, or 12AT7 if you can as these are quite popular tubes also.
very clean sound for preamp
Is there any way to visually determine the amount of wear or use that a 12AX7 has had? Is the carbon deposit at the bottom of the tube an indicator? Thanks for the great videos!!
yes it is usually mean its run hot maybe worst case in a shield. Don't get to hung up on telefunkens capacitors are more important and there are plenty lesser known ax7s that can still be had nos.
One of the valves you showed was a 12AU7 (ECC82).
@Prozoot if you can't see through the silver halo it may be a good sign also darkening glass a sign of wear loose micas inside glass silver halo disappears is a gassy tube low testing tubes is a bad sign of replace.
i have some ERA tubes (ECC803 If I'm not mistaken...) I found them with an amplifier in an old warehouse 30-35 years old is definitely the amplifier. I used one of these in my Presonus studio channel (channel strip)
Unfortunately the articles are not online for free. You would need to get back issues of the now-defunct magazine. If you do a Google search on Vacuum Tube Valley you can find places to purchase back issues.
The 12ax7 is probably the most common tone tube in the indudtry, if its an audio application, it's got a 12ax7...
we need more tubes in the world! without tubes in our technology, a EMP would send us back to stone age. also all data would be gone if it isn't stored on a disc
I respect your opinion. However, I invite you to look over back issues of Vacuum Tube Valley where time and again NOS tubes tested head to head with current production tubes were judged superior. The technical details are in the articles. Manufacturing HAS improved since the pre-1970s, but to make a profit on a $6 tube, the Russians and Chinese cut corners. Vacuum pumping is just one example. Russian tubes are pumped just one hour, USA tubes were pumped 8 hours or more!
Gawk! What a tube collection! and I bet that the ones shown didn't even skim the surface.. Can I have that Mullard long plate? I promise not to tell anyone.
I bought a 12ax7 tube that's supposed to be a Mullard brand but marked RCA. When I posted a pic on my guitar forum two members IDed the tube as an RFT because of the "throwing star" mica design. I have it in my Vox VT40+ amp though and it sounds fantastic, much better than the Sovtek it came with.
My guess is that I bought a remarked tube?
Used to have boxes of old tubes, lots of 12AX7 and 12AU7 now I have just some old radio tubes. Not sure if I had any really choice ones
How many of those would you like? In less than 10 minutes I found 5 of those in my very old collection of '50s tubes. I also have 12AT7s, 12AU7s and 12AY7s. Mine are a mixture of RCA and GE. How about some Nuvisters or a 3DR3 lead covered high-voltage regulator tube?
Which EF86 / EL84 tubes do you recommend in the original Mullard 3-3 amplifier design?
Call me weird, but I have a JTM45, that had 2 Telefunken 12ax7 in and a mallard 12ax7 in and it sounds better with new tung Sol tubes in V3 and V2 and a Chinese tube in V1...the Telefunkens and Mullard all test over 70% Gm...even so, the old 12ax7s were shot with a pellet rifle in a Crowley-esque ritual because according to my Gematria calculator "12ax7" translates to "field mouse porridge".... The time you spent reading this, you will never get back....
Slightly off topic with analog tester. I have so many of these preamp and vacuum tubes and got a Heathkit VTVM given to me. I’ve read about testing continuity /filament but what else should I be testing/looking at for a good tube with volts and ohms.
ahh, story of my life lol. Thanks Nickolas!
My vintage heathkit has mullard made in England 12at7 tubes and Hitachi Japan tubes and 50C5 usa tubes
At 59 sec,you have a 12au7.
Wouldn't the *best* Telefunken be the frame grid ECC803S?
(Then again, try finding one-- the smooth plate is the best anyone is likely to come across.)
Great Video!!!
I believe I found a dynaco labeled pair of possible telefunkens made in w Germany.. they have the diamond on the bottom… I would like to send you a picture to see what I have.. pending testing that is
HELLO. Of the 12 current AX7, wich is THE BEST. J/J, Mullard, Tung Sol, Electro Harmonix??? THANK YOU
How are the Philips Miniwatt tubes compared to these. I have about 20 ECC82, 83 and 85's mostly smoothplates. I guess they're pretty common.
what is the difference between a tube having a long plate compared to a non-long plate tube? I don't understand what the long plate does to the tube any advantage of using tubes with long plates?
lol........and finally the 2xx7, and lastly the 12xx7, and then finally the 12xx7, he should be the spokesman for energizer.
from a newbie looking to acquire his first Headamp (little dot III), what's the life spam of these tubes, do they "break" from usage just like light bulbs and need to be replaced or do they last pretty much a lifetime? And I'm not talking about physical damage, only day to day listening...
arncj18
life spam: if you keep it in the fridge.. for two weeks.. if you bake it..
it takes a few seconds ;)
Radio tubes can go up to 30 years of good operation - depends on usage and environment - ofcourse if they run within specs.
i seem to remember seeing a lot of 82's and was it el84?'s as a kid in the 70's.
i was thinking of a 1 tube mono audio amp x6 for a 5.1 setup off the pc....
Tell me something , is it true that the CK5755 (Raytheon) can be used as a 12AX7 and ECC83 with a different socket ?
That's the number one question my clients ask. Why can't the USA made tubes again with quality like the old days? My answer: you simply cannot and make a profit. You need a metal shop and a glassblowing shop, a materials coating shop and a package line. When your competition is a $6 tube from China, it cannot be done at a profit at those prices in this country, using the old production methods.
When i was 14, one of my relatives threw out a large box of Telefunken and GE tubes, amongst others, because he thought they were worthless and taking up space. Im still beating my self up about it because im the one who helped him put it in the trash!
transaxlle it happens - i found a 6502 - pins in bad shape - first and last thing i ever dumped - ok, don't give me that look.. no.. my room is not a hazard zone.. :D
A very interesting & informative video. I will be looking through my valve collection now to see if I have any rare ones :)
I've just ran across boxes of old tubes. I know there are a lot of 12ax7 and 12au7 is there a place I can find out more about old tubes I could use in audio applications?
Raytheon had a head quarters in France and I by luck won a bid on a Silver plate 12ax7 which test like new well almost NOS.
Raytheon acquired some plates and other parts somehow copied it in there factory , that tube but must be very rare .
Very informative
My uncle had a telefunken stereo man That thing sounded great he took the tubes out the 12ax7 or ec83 pre amp tube but it didn't say "Telafunken" on the tube it had another name? Did they rebrand tubes for others? Because the tube was factory. Thx
I found a 12Ax7 that the only thing on it that icon just barely make out is towards the top I can see U.S.A. & underneath that I think it says 12AX7A1. Can you please tell me anything about it? The writing or really what I can make out is so faint & almost has like a gold tint maybe?
Usually if the tube has "USA" above the number it is made by Sylvania. If there are small grey dots below the 12AX7 on the label, it is likely Westinghouse.
they still make vacuum tube audio equipment but, they are only found in high end audio equipment and Samsung's 600 dollar Bluetooth speakers and some of their surround sound products.
hi i got a question.i have 5 mullards ecc83 valves with code i63 and b7f4 on all of them.can anyone tell what year they were made.the plate is the short one..
good video, like the rozac155 comment, to funny the joker smacking, even picked up a little joker accent, was hoping for a double smack to end the video
Good day
It is possible that the original radio dealer switched the originals out for a cheaper brand, or, your Uncle had it repaired yrs ago & they were replaced then.
Really, to be honest, it's true there are "good" & "better" versions of tubes available, the "better" version installed in "un-restored" or "budget" stereos will not "show".
You'd need a *real expensive* stereo to show off the minor difference.
Buddy will want twice or more the $ for His "fancy versions". Normal ones are decent.
I have Yaqin MS-12B Vacuum Tube Line stage / MM Phono stage Pre-emplifier with low impedance output 12AX7 + 12AU7 vacuum tubes for amplification for my Turntable, and my question is:
1- Can I upgrade the original tubes to better one.
2- There will be any difference in the sond quality If I upgrade the original tube to better one.
3- What kind of tubes 12AX7 & 12AU7 vacuum tubes you recommend me to purchase for my Yaqin MS-12B Vacuum Tube.
Thanks.
I love valves.
Do you know anything about Bogen Sound Sytems? I think around ‘53 or ‘54 or something like that
Hi I have a a number of Osram B339/12AXZ7. Are they rare? I believe they may be worth alot? Thanks for any help
what you think i should do with some webcor and sylvanina 7025s,and 12ax7s and one 5814 tube? worth holding on to all from about early to mid 60s
What is the price of the tube,ECH 81
& EL41.( 8 pin) Philips Holland..
Hello, please contact us for tube pricing at: brentjes@audiotubes.com thank you! Brent Jessee
Have listen to the Mullard with the halo ring . Sounds god but so sensitive to vibrations.
I have a tube that says Bestest stamped on it is that rare?
Nice video, Can you do one of sovtek tubes?
is Emitron Kt66's rare and worth money? I got 2 of these. matching pair.
I kinda like it.. Reminds me of the Joker.
do you know who made Webcor 12AX7s ? and which mic do you use?
Yep, getting harder to find the premium ones every year. Case in point, the Western Electric 274B. A super well-made version of the 5U4G. They do really sound better, even my skeptical wife heard an immediate improvement in my little shop integrated amp when I tried one. Deeper and cleaner bass, more sonic "space". But they are impossible to find and are selling for over $1000. Now that is either mass hysteria or money no object "gotta have these to be cool" buyers. I don't set the price!
Rca807pair valve for ultrasound machine what's prices and your company Addresses place?
Rca807valve pairs place you provide me.
@@ashoknath651 Hello, Please email your request to brentjes@audiotubes.com and we can give you full details on price and how to order. Thank you.
@@ashoknath651 Hello, Please email your request to brentjes@audiotubes.com and we can give you full details on price and how to order. Thank you.
Are all Amperex 12AX7's valuable? I just got one that looks like the very first one shown. Has the bugle boy and says "Made in Holland" on the side. Still in the box, not used.
What tube advise (recommendation) for Presonus Tubepre v2 and Microphone Rode NT1A ?