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.
There are also "ALPS attenuators" with regular 1/8 watt metal film resistor floating about. Had a few but the QC was pretty bad. Out of say 10pc 3 would be bad due to popping & other noises.