Here’s the story, as concise as I can make it. It probably takes very specific knowledge of this equipment, but maybe the problems will ring a bell with one of you
I have an integrated amp for my stereo with vaccuum tubes.
Well, one of the tubes was not lighting up so I sent it in for repairs. They retubed it, reset the bias, and burned it in for about a week and sent it to me. No probs.
I ran it for a few days, then one day the tubes didn’t warm up (the fuse blew during warm up). I replaced a fuse and everything was fine. Ran it a couple days, blew a fuse again during warm up.
Hmmmm. . .the repair guy sent me new tubes. Before they arrived, I was listening to music one night and the tubes just quit. The unit still has power. It has little fans that blow on the tubes and the fans were still running.
I plugged in the 4 new tubes, and nothing.
I called the repair guy and he said something like, “hmmmm. . .might be the power source. What’s the voltage in the line?”
“I set the bias for our voltage which is 127.”
I don’t know the implications of that. He said line voltages can run from between about 110 and 130.
Can any provide possible “trouble shoots” for this type of behavior?