Vacuum tube RC generator restoration (Tesla BM365U)

Restoring a Tesla BM365U RC oscillator (RC generator) from the 1970s with vacuum tubes. It generates a sine wave signal from 25 Hz to 30 kHz.

This RC generator on my website:

Please support my channel on Patreon:

Instagram:

[marty_thesniper]

It never ceases to amaze me how you always manage to solve various faults and problems. Great job as usual!

[electronixTech]

Tesla made some nice quality components and test equipment. Even their brand name looks classy with the art deco font.

[iamdarkyoshi]

Excited for another vintage repair/restoration :D

[tajtrlik]

Na video o oprave ďalšieho elektrónkového prístroja z tvojej zbierky som sa veľmi tešil a opäť som sa nesklamal, takže vďaka ti za neho. Pekne to tým prístrojom - generátoru a osciloskopu na konci videa sluší, je vidieť že patria k sebe 😀.

[oldblokeh]

It might be worth mentioning that the lightbulb stabilised Wien bridge oscillator was invented by Bill Hewlett and was Hewlett-Packard's first product back in 1939. Prior to this invention high purity sine wave oscillators with a stable amplitude were very large and expensive.

[JohnnyX]

Many thanks again for a fantastic video and your time :) Title should read Pozor! žádný hasicí přístroj! so we have to do something about that ;) I know I do not have to do Czech but I hope in someway I am making a smile for return of appreciation of your hard work Mr. divoká dioda lol sorry best translation I could get 🤔😅Anyway, děkuji příteli :)

[rostislavhruska]

Diky bohu. Dalsi video s nejlepsi anglinou jakou jsem kdy slysel.

[mvacoss]

I love your restoration videos. Today I got this thing except it doesn't have the "U" letter in the end of the name. I got it from teacher at a secondary industrial school in Písek that I'm studying at. Planning to restore it in a near future so this video is really helpful. Thank you for your great work, keep it up!

[GZQCArtwork]

I like the older and vintage test gear, built for a purpose and not a price.

[kdbyb]

I always love your cat's comments. She's awesome! Nice video - these Telsa units look extremely well made.

[pauldery]

Excellent video of a absolutely beautiful piece of vintage hardware. Thank you for sharing.
Paul, USA!!!

[MarkMAK]

Nice work, thank you for another wonderful video :-)

[mojoblues]

20:56 you could use the FFT feature to minimize the distortion by setting the potentiometer.

[TheBalconyWorkspace]

It's said the darkness inside the tube is lead from the glass. High speed electrons smash the glass and (maybe) extracted the lead outside out of the glass. Darkness in a tube is always used to visually determine the tube's life.

[shamshadansari]

Thank you for sharing your knowledge with us. I really appreciate your explanations.

[SpeederXL]

Nice!
I have not seen a wien bridge oscillator using tubes before (when this thing was built, operation amplifiers probably didn't even exist) 🙂

[michamaecki]

I wonder if you could use something like pPFC choke from old ATX in series with mains to lower the voltage.

[PrerollEdu]

How do you use it, anyway? Asking for a friend.

[TheCommuted]

Add parallel resistors to tune it and preserve the authentic character

[dominikw]

Tesla kd 502, 503 mocne tranzystory(ogólnie podzespoły są mocne)😉. Zamiast 2n3055. Produkcja elementów w szczegółności za czasów Czechosłowacji lepsza jak w Polsce.🙂Mam zbudowany na tych podzespołach wzmacniacz mocy i jest niezawodny.