I’ve had my CSP3 for 3 or 4 years with no issues at all. Suddenly the right output tube keeps going bad after one or two hours of play. Only the right. Nothing has changed. Same amp, same source, same speakers etc. I’ve gone through 4 JJeloctronics E88cc’s. I’ve been using these without a problem until now. It seems after a while the right output tube does not get as warm as the left then it quits working. Any ideas or input would be greatly appreciated.

Regards,,,,

If you haven't, unscrew the chassis from the case and check the fuses on the board inside. It's possible that one of the two smallest value fuses is going bad or not making good contact. I believe each of those two controls a channel from the rectifier and the fact that you are having issues with one channel could mean that fuse is the culprit.