Thank you tubegroover. I wrote to Bill Thalmann about the problem.
He confirmed my suspicion that the issue had something to do with tube placement, and recommended a tube socket and switch cleaner.
I also asked what modifications he does on CJ equipment.
He confirmed my suspicion that the issue had something to do with tube placement, and recommended a tube socket and switch cleaner.
I also asked what modifications he does on CJ equipment.

