That, exactly that one, was my first electric guitar... wow... Then I bought another one of a better brand, one piece, active pickups and I don't know how many other things... but I rarely used it, because it was so exclusive, I didn't want anything to happen to it... absurd, I know... I know.... But well, I remember hours and hours studying with the RGX312... and I fantasized because it was, in appearance, the same as an ESP of kirk hammett, from Metallica, black with a beige handle... (if I didn't play like him, at least the guitar looked like his) hahaha... I ended up giving it away because I left the instrument... and now -20 years later- I miss it... I listen to "The call of Ktulu..." and I would like to play it... (yes, the twists and turns of life...) Your video brought back good memories and longing... You never know when something you produce can trigger an important memory and emotions in someone else... Thank you!

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.

I built a guitar amp using a pair of Russian GK71s. Very nice 250 Watts RMS. Lots of feedback and 1800 plate volts.

My friend it is not if,it is sign of micro, correct your self before teaching others.

Omg GU29 looks like Soviet vodka bottle 🍾.. I think it works better with russian balalaika 🪕

Ты думаешь эта лампочка что-то может сделать? А как тебе лампа в метр высотой и с водяным охлаждением?

Ну ты и дятел, устроил опыт с длиннющими проводами, ладно х... с ним, а то что у лампы нужно настраивать рабочую точку и не каждый выходной трансформатор по сопротивлению подходит для этой рабочей точки не учёл.

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 .

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

Спасибо вам я увидел незадукоментированое применение лампы гу 29 для передатчиков в низких частотах)) 😅

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.

Man that OP90 is perfect for Doom/Stoner Metal. I ordered some right away after hearing that

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.

tube is kind of like a Sylvania 5894

GU-50 Mister !!!

I know super old video but it was quite entertaining watching your ram oc journey on this one^^ not too long ago i also tuned my 3200c14xmp bdie, but im running quite rare setup with 4x16gb so unfortunately 3466mt/s cl14 15 15 15 + somewhat tight subtimings was the max i managed to run on my 5950x. Im using x570 crosshair 8 hero mobo and with that ram setup the absolute max it could post was 3600mt/s but couldnt manage to stabilize it as well as 3533mt/s. If i had only two sticks it managed to boot 3800mt/s no issues but at 64gb in total it seems its waay too hard on memory controller. I tried absolutely everything, all SOC, VDDP, VDDG, procODT, DRAM voltage, RTT values, CAD values, everything something either mobo, ram sticks or cpu IMC just said nope. Oh well at least the gaming performance is fantastic, i basically get 15-25% better fps than those who use low quality xmp kits like 3600 cl18, so im happy with the result just a bit bummed with 3466

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😉

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

40Watts on two anodes. В оригинале - мощность, длительно рассеиваемая анодами 40 Ватт

Does the shroud around it make it sound much louder. I have one without the plastic cover or shroud and it doesn't sound very loud.

You playing rock on Soviet tube, not it is Soviet Rock! ✊

Try with GU 50! worked carefully you will be amazed!

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.

Might have trouble getting over 3ghz on quad channel with 8 sticks. I had a fair bit of trouble with 8 sticks in my x99 A2 with the 5960x and ended up downclocking the ram to 3ghz from 3600 (or 3200) the set was rated for. Stability was sooo much better and performance only took like a ~5% dip. That was 10 years ago this month... I hate time haha You might have much better luck with later lifecycle ddr4

I really enjoy your videos keep up the good work! You gave me the confidence to work on my own tube amps and now I’m just sticking around for ride

GU-29 is used in radio transceivers usually. I’m not sure if it is a good idea to used it in audio amplifier.

Actually, you mean 829B.

TG PTM PhaseSheet on RX6600. Works like a charm. Diff between general temp and hotspot temp is 10K at worst and more like 7-8K on average high load. With stock paste it was rather 15K most of the time. In general, temps are down by approx. 3K which is not super relevant for me, but nice to have

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!

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.

nice,amazing what can be done with russian tech,great you explained every step

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)

It us not ruzzian. It is Soviet

I just got the bykski block for my powercolor 6950xt. I'm so stoked for my first loop. Thanks for the video bud!

A bit confused! That thing looks like it could power a small rocket...😂👍🇨🇦

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.

RUSKE ILI BILO KOJE DRUGE, AKO SE PRAVILNO PRILAGODI IMPEDANCA TRAFOA NAIZLAZU, AKO SE ISPOŠTUJU SVE TEHNIČKE STVARI KOJE SU U TEHNICI CEVO OBAVEZNE, ISTO ĆE RADITI I RUSKE I KURČEVE.. NE LUPAJ,...

Exactly what I'm looking for - what PTM7950 pad looks like after you lifted the heatsink. It spread out like thermal paste but not fully pumped out, and seems like it's reusable too 👍 Thanks

I got one of these in a trade for a 412 that I got for free. One of the best amps I have ever played. That said, big agree that the master volume is straight ass in sound. I would LOOOOOOOVVVVVVEEEEEE to see you install a proper master volume utilizing inserting a pot between that wire (because I too would also like to have a master on it that works better, I would be down with an email explaining how to do it as well. I really would appreciate it). I think I would put the pot on the front in the upper right input jack though, like you, I also find that input completely useless.

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 :)

There are some things that I can help you with on this circuit if you’re interested, I discovered in my building and research on this circuit that the “consensus” schematic is wrong and missing some important components, Chuck Collins(Theramaniacs) himself recently commented that he doesn’t know how his name even got associated with it. My design is a blend of a few different approaches and gets the controllable feedback that Albini used it for exclusively. When you hear one working properly it takes on entirely new dimensions that no other fuzz circuit matches in my experience.

Subscriber here. I cannot understand your name. Talk too fast for my old slow ears, LOL. I need an email address. I have a plethora of new resistors and other guitar amp parts I'd like to gift you if interested. I was building amps, and am no longer doing so. So, email address? thanks, tom

At least being Nehemiah the FPU was also run at 1GHz. Samuel 2 and Ezra-T performance by comparison due to running it at half clock...is actually kind of tragic. Some games (if they don't crash asking for Pentium) run better on a Pentium II 350 than Samuel2 @ 700MHz or Ezra-T at 866MHz. Mine at 1.2GHz at least managed to beat my Pentium III 650 (on the same board). Though said board works best with Samuel2 as I can change the multiplier within BIOS (option only shows with C3, Ezra-T and Nehemiah lock up). Works fine when playing DVD (no HW acceleration enabled), can't tell if it runs any cooler than PIII 1000 as I'm having to use a rather overkill heatsink (socket clip broke) meant for Athlon XP 3200+. And both run at around 32 degrees C. No issues are guaranteed to be the fault of the CPU with my PC either...Windows ME, SiS 315 and AudioPCI 5200. Got to have a "home" for the odd and poor quality/poorly performing things.

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!

awesome määän! ❤

Thanks for making this helpful video. I just bought the parts - and the torx bit (thank you) - and I wouldn't have been willing to try without seeing this.

This is a nice little channel you have, we have similar interrests, electronics, computers and music.

NICE!

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.

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