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 picked up a sweet tube amp, and was just after some more info on it, as I have not been able to find anything on the net.
It is a "Sound Multiplex" amp with built in AM and FM.