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Discussion in 'Amp Central Station' started by caprace, Jan 12, 2015.
thanks for this, Tubeswell...
FWIW, increasing one of the .1uF bias coupling caps to .2uF should get the bias supply to -50V (Sim courtesy of Dave H @ ampage)
I followed this thread with s lot of interest as i try to fix a problem on a tremolux ec reissue (the same as you have on your bench).
May i ask you a few questions?
Stefan from Belgium.
Reviving old thread. Got another one in. Customer wants it louder. I'm thinking it would be a good candidate for a switched single/parallel first stage (to utilise the unused triode in V1). Also, the screen supply resistor is 4k7, and I bet it would sound cleaner and louder with 1k (like a BF Princeton) or a choke in there. Its still going to be dirtyish. Lifting the 1M in the tone stack will then allow practical cleanish gain. And a GZ34 with a bigger input cap for the bias supply to get more -ve bias voltage.
All sorts of possibilities here.