• 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.

Almarro A318 volume pot help

An apology is in order. The transformer heater supply is not centre tapped. The twisted red wires go to the octal tube sockets pins 7 and 8 and all the pin 8,s are earthed via by a thin black wire to pin number 7, on the nearest 6C33C-B socket, which in turn is earthed via black wire that goes to the earth star point which is linked to the chassis ground via a 5 ohm resistor.
For the 100 ohm resistors to have any effect in reducing hum, there would have to be alterations made to the wiring.























































































































































































































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