I have a closet classic 70 Champ. Replaced elctrolytics and a blown resistor. Works great but just too trebly and bright. It sounds good with treble on about 1-3, but still not a lot of bottom end - it's pretty loud too. I have a 76 Champ that sounds really warm. I also sold a 73 Champ due to same thing , being too bright and trebly in the past so I don't want to give up on this one cuz I was kicking myself for selling the previous one. I've looked inside both my Champs and everything seems the same and ok. I also have swapped tubes and bought a m-f RCA lead to plug in different speakers. Right now I put in a Weber 8A125-O which should be darker, but it doesn't matter which speaker is hooked up. I'm more than happy to add a resistor or cap if I need to but the amp bias is something I haven't messed with on any amp. The amp ran super hot before I replaced the blown resistor but now the chassis is ok - it was getting hot - and I don't think anything crazy is going on now. I have seen a few videos working on Champs and I know they "run hot" on volts. A friend said swapping out a coupling capthat goes to the 6V6 will add bass but I would like some experienced opinions. Camera flash makes attached pic look weird but the board is looking good. Thanks all!