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.
Hi Everyone,
I am trying to test my 12BH7 tubes on my precise 111 tube tester , can't seem to find the number? Is there a different number that can be used ?