The hum and unstable bias just might be due to poor contacts on the pins. Bend them a little if you can, then get some contact cleaner and clean the pins and sockets. Put the tubes back in and you may not need to send these to VAC???
is there a way to tighten pins in tube sockets?
Two of the output tube sockets of my VAC amp don't grip the tube pins tight. The tubes are Winged C and I have several sets and all exhibit the same looseness. Before I send it back to VAC, is there a way to tighten the pins?
The problem I experience from this is a right channel hum and unstable tube bias.
The problem I experience from this is a right channel hum and unstable tube bias.