• 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.

when do filament supplies need to be floated

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AJT, I'm not certain I completely understand the second diagram in post 39. where in the circuit are you obtaining the voltage from. the 100 ohm resistors to heaters. Do you mean connect the 6.3 transformer to the 100 ohm resistors? I understand the first diagram if the word fil. ref. meant ( is the same point as the center tap to the 6.3 heater winding is connect at this point.
 
NOS Stancore

NOS transformers for consideration for franks line preamp
 

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