I have a TMB that after about 10 minutes of play or so will jump in volume by about 6 db. It's about the amount volume gain you might do with a clean boost for a lead. I'm not using a boost, I'm just using that to describe the amount of volume gain I'm hearing. That will go on a for a minute or two then it will drop back down to what what it was when I threw the stand by switch to on.
I've done some googling on the internet and it seems like it can be anything but there's got to be a way to narrow it down.
It happens on either channel - this suggests that it's not in the pre-amp tubes, but perhaps the inverter or the power stage. In my experience with electronics, it seems most likely a tube or a cap, but I support a back connection or solder joint is also possible? Resisters and connections typically either work or don't, fail fully or not.
Any suggestions?
--chuck
|