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.
I have an SA-5.1 preamp and one of the tubes in the high voltage regulator inside the main chassis has no markings on it. There are three tubes in the regulator section: a 6JC6, a 5651, and a larger tube with no markings. Does anyone know what tube type it is? Thanks