Ugh, my little GK is giving me troubles. I tried playing (first time in a while, actually) and it keeps cutting in and out. Unlike a loose wire, it sort of fades out over a span of maybe half a second, then fades back in. Somewhat randomly. I'm no electro-wizard. I swapped basses, and got the same result. I would blame the cable, but this amp has done this to me before with a different cable, about a year ago.
There's a shop in town that takes in amps and sends them to their store in Lansing where the amp techs are. Bad part is that I had them fix it about a year ago for the same issue. 'M thinking they didn't really fix it last time, just caused it to do it less frequently.
Anyone got any ideas what to tell them to look for? I'll try to get a video of it too.
When you had it fixed last time did they give you a description on what was done? I’d have them check their own work first to see if anything has changed.
The other possibility, RR, is that she’s gotten to the point where the power section is finally wearing down and you might be looking at a cap redo or something like a transformer transplant. I dunno, old age has set in and you’re seeing the symptoms?
I do know this. Try and get an estimate or out on a ceiling to how much you’re willing to pay to have it fixed. I know you love your GK, but amps can be bought for a song (no pun intended) nowadays and it might be cost-effective to go with a replacement that’s new or slightly used.
Keep us up on what happens and what you decide. Good luck!
It sure is solid!

Keep it rocking, my trailblazing friend!