• WARNING: Tube/Valve amplifiers use potentially LETHAL HIGH VOLTAGES.
    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

Shared DC filament supplies

According to the schematics on this thread, each filament has its own self bias resistor (but are actually in parallel, so not individually self biased).
But those bias resistors are not capacitor bypassed, and the filaments are in parallel across the battery, so . . .
There will be crosstalk between the L and R channels. Channel Separation will be reduced.
 
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