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.
Just got some on hand. A 4 pin (UX-4) tube. The dealer told me those seemed to be voltage regulator.
But I have no idea about the exact pin out nor specefication.
Anybody knows?
Thanks for your help.