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RE: Fisher 400 receiver conversion

You'd have to drop the B+, kind of a lot. You don't want to go with cathode bias because then you won't get that extra bit of oomph from class B (this also prevents you from just slapping in some big 50 watt resistor to shed 150 volts), and the power supply is a voltage doubler, so you can't exactly just switch to a choke input filter. Then again, if you could lower the voltage produced by the power supply, now all the small signal tubes are going to be off. It's a can of worms for sure!

If the space and filament current are available, EL34's might be an option that's a little more workable. Depending on your 400, you might have 6.4K OT's or 10K OT's.

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