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RE: Fisher 400 receiver conversion

triode strap them, go cathode bias and run them conservative to make up for the high plate voltage.

jj 6v6 might better tolerate the voltage.


have you already recapped the unit?

you could also change the power transformer and dump the voltage doubler but you'd have to be sure to get the correct voltages to all the other stages in the amplifier. that will take a bit of work!


I just went through an HK TA-224. It is the one of few rebuilds I didn't change a thing from original. Just bought some nice panasonic caps and replaced all of the electrolytic caps.

As complex/busy as these receivers are I think it is wise to keep the original intent/design in mind and work toward a restoration - rather than modify.

the first tube amp I owned and went through was a Fisher 400. I still have the 12ax7s. I wish I would have kept it. Having built a few SETs and push pull amps - I really appreciate the old receivers now in all of their "original" glory.


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