Wayne Parham Messages: 18726 Registered: January 2001
Illuminati (33rd Degree)
That is a common symptom of old tube gear. Many times, the capacitors are bad but everything else works fine, even the tubes. If you can swap the power supply capacitors, try that first and see if that fixes it. If you can't solder or identify the capacitors, take it to someone who can. It isn't a difficult job and the parts don't cost much. There's a good chance that will fix it.