It's a two channel 6V6 amp, the channels are identical and each have Clean, Drive and High modes.
In Clean mode it sounds awesome with a strat but in Drive and High it has always sounded really "bitey" with humbucker guitars on the bridge pickups and I've never been able to dial it out successfully. Anyway I was reading a thread on here and someone mentioned bright caps and a light bulb came on!
It can't be that hard to open it up and see if there's a cap across the gain pot can it? It turns out that the answer is yes it can!
It turns out that it's actually a single channel amp with two sets of controls and 19 DPDT relays to reconfigure the circuit depending on channel and mode!
I managed to find two caps that were connected to the gain pot wiper on channel 1 and the other side of one was connected to the top so I pulled it, it turned out to be the Clean bright cap so that went back in and I pulled the other and that seems to have done the job. It appears that there are different bright caps for clean and drive/high but they're only connected across the gain pot of the channel in use. This was a case where a standby switch was very useful because it let me probe around and change channels/modes without having B+ in there.
If anyone can point me to a schematic that would be greatly appreciated but for now it's sounding great.
Craig