I recently bought one of those gizmos to bias the tubes in my amps. I was able to bias one of my amps, but on my JCM 900, I had a little problem.
The reading was at 16mA, so I turned the pot to get a 35mA on my multimeter, but the pot reached the maximum turning point, yet I was only at 20mA. Is there anything I'm missing?
Amp specs:
JCM 900 MKIII 50 watts
EL34 tubes
Thanks!