First I checked the bias and it was close and easy to re-set to normal. I then switched the input cables from my DAC and the other channel was low volume. I tried replacing each side of the driver tubes and the center as well and same channel remained low volume.
After a short time during the testing period there was another output tube flare up and I again immediately shut down the amp hopefully not frying an output tube.
BTW I also changed all the output tubes as well, re-biased and still had the same low volume problem on one channel and then another flare up. There was also a little noise when adjusting the bias kind of a crackling noise.
I took the bottom off and everything looks OK no crispy parts or obvious issues.
Since I am having these flare ups I don’t want to keep firing the amp and do something serious because I am in Costa Rica a long way from parts suppliers.
I do have a spare Weber rectifier but no quad cap. Any ideas I could use some suggestions.