Bought it brand new about 5 years ago. I treat it very well (just like all of my gear), and have not had any issues with it until now. Recently, when I turn it on the output is really low. I have to crank the master volume to get decent volume. Gradually over a few minutes the full power seems comes back and I can turn the master back down where it belongs. I used to run it with gain at 12:00, master at around 10-11:00, and that was plenty loud. With the current issue I need to have the master at like 3:00 (or more) to get to that volume, until eventually the power "comes back" and I can lower the master. I've tried it with several basses (upright and electric), and have unplugged the internal speaker and just run an external speaker. Still had this issue which leads me to believe that it is definitely a problem with the head. (It's the "Combo Head II"). I'm thinking about just making this my practice rig and retiring it for gigs, unless there might be a cheap or simple fix. Any thoughts? Thanks!