First up its a 1964, all new electrolytics 6-7 years ago, including the cap can. Haven't used it for maybe 6 months, was just playing it at like 2 or 3 and noticed it seemed kinda "ratty". Messing around I tried it with the reverb off and it seemed normal, that got me switching the driver tube, a 12at7 for a 12au7. Then I started turning up the reverb knob, which normally is on 2ish all the time, noticed the volume goes up with the reverb knob and adds distortion. Just thought before I tear into it, maybe one of you gents has run into this before.