Thanks for explaining it so well Alex.
I have absolutely nothing against having a silicon based CCS. I was more interested to
know if it's purpose was only for flexibility. But now I know that it comes handy to set
the optimal current for the O.P.transformer.
I don't see how I could resist to build me one of these RH amps. I have a pair of
'Hammond 125E SE' and some old chassis and a lot of tubes, all I need is time.
AlexKitic wrote:No, that was the story about the driver tube... you need a driver tube with a relatively high transconductance and relatively high mu... while the ECC81 fits the bill ideally, you can use 5965 and E180CC just as well. ECC83 will not drive to full power, 6SL7 even less suitable... etc.
Oops. I must have got that wrong. Thanks for correcting me.