Re: Selenium rectifier question

EricM wrote:

Forgot to mention that the 'buzzing' only starts after the relay
closes -

Well of course it does, because before that the amp isn't working at
all. A tube amp without anode voltage is just a refined heater.

Do not forget that this is a tube device. Some of the tube cathodes
are heated with 6.3 Volts alternating current of 60 Hz. If there is a
cathode-heater-leak (due to tube age) you get AC into the signal path.

Note that the preamp stages are operated with 400 Volts off the
stabilizer circuit around V9 - V10. So have a look at C20 / C2 - they
should neutralize AC ripple there.

I'm scratching my head about connectors 3 and 4 on TS2 named
regulator filament. Somehow TS2 in the ps-schematic doesn't seem
to be TS2 in the amp schematic.

Regards,
H.


.

Relevant Pages

  • Re: 3 cd stereo
    ... you're probably up for a replacement laser. ... wall tube amps from street walk ins. ... tube amp distortion before it gets too loud. ... The Third Programme transmitter that used to be located there, ...
    (sci.electronics.repair)
  • Re: 845 first impressions, 22dec07.
    ... But the Chinese ARE FREE to charge more for their tubes.... ... Anyway, considering the amp is a commercial product, I find ... and efficiency quite high for class A triodes. ... tube line up, with well applied NFB so that there is almost as much NFB ...
    (rec.audio.tubes)
  • Re: Prototype "tube-like" solid-state amp circuit
    ... or so in power - and I want it to sound good. ... you can't just swap a transistor for a tube. ... decided to do was use the transistors in Sziklai or Darlington pairs, ... worse than a typical pentode amp without feedback. ...
    (alt.guitar.amps)
  • Re: About stability and feedback
    ... McIntosh or others. ... A "conservative amp" built by a copycat will never be as ... of mediocre makers of tube gear. ... So its wise to include the local CFB of a CFB output stage in the total ...
    (rec.audio.tubes)
  • Re: Ping Prof Turner: Amplifier questions
    ... Rin to the anode circuit of a CF is very high, and the output voltage is ... >>But if you are to drive an output tube set up for fixed bias from a CF ... The mosfet amp I have will run switched off for 20 seconds since the PS caps ...
    (rec.audio.tubes)