Support your local electronics man.
Surely would if there were one. Fifty years ago there were three crackerjack electronics repair nerds in a town of 6,000. Today, 12,00 people, zero repair guys.
Mystery Of Red Plating
My tube amp (ARC VT130) was blowing up her screening resistor on the left channel. The two Sovtek 6550 tubes would glow red- pulsating with red heat. If it weren’t so disastrously bad for them it would be fun to watch. I assumed it was a bias problem. I also
replaced resistors - more than necessary but as the story will tell not the right one. As it turns out it was bias- and a lot more! I had a resistor with a pin hole in it that was arcing to a trace on the printed circuit board which was pushing 100volts into a triode tube ( a 12BH7A) which is a voltage controller for the 6550s.
https://imgur.com/gallery/f9E1Yqd