> I had a FL-2100B amp and the way they said to tune the
> input is to
> disconnect the high voltage lead from the transformer and
> tune the input
> that way.
Wow!! Is that a silly idea if I ever heard one!!
When you remove HV the input impedance of the cathode driven
tube goes way up. The grid current also goes way up.
Bad way to tune the input, good way to ruin the tubes.
The only good way to tune the input is to either remove
filament and high voltage and shunt the filaments to ground
with resistors that emulate the driving impedance at each
tube cathode, or tune the thing while operating if that can
be done safely.
73 Tom
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