So yesterday I popped for this old '62 6G4-A Super amp. I'm selling my Twin to finance it... anyhow, it sounded great in the store, love especially the phasey three-tube vibrato. Upon getting it home, however, the vibrato started "ticking" when i got the speed above about 3. Didn't do this in the store. I'll probably take it back and see if they will pay to have someone repair it for me (but I hope they don't send me to some amp butcher...). The amp is amazing though, sounds really killer. I think it just needs a little touching up. Upon opening it up, there are some stickers in it saying it was serviced in 1990, probably a filter cap job. They are still holding strong as the amp is dead quiet. NONE of the electrolytics on the board (are they called cathode bypass caps?) have been changed though, they are all the old Astron 2-in-1 types. Furthermore, this amp must be pre-blue mallorys, as it has all those yellow Astron caps too... see pics. I swapped all three vibrato tubes and it's still making the low-end thumpy motorboating type noise when the vibrato is on. Is it probably those old crusty caps? Also there's some weirdness going on around the rectifier tube... looks like there are about 4 diodes strung across it and a bunch of resistors.... see pics. Does this mean the tube rectifier is bypassed and is doing nothing but loading down the filament current from the PT? FINALLY, the least important thing... this isn't really technical but it looks as if someone has painted the cab at some point, maybe black or grey, then blonde, then someone did a fair job of cleaning all the paint off but there's still a lot of it there. I think cleaning the rest off would be a fun project, any ideas? I'd leave it as-is before getting it re-covered, but I'd like to clean some of it off if possible! Any thoughts? Some nice cigarette burns too... this thing is trashed but man does it sound good! Thanks for any tips.