That is the power supply board. Single cap is 32uF 450v for PI, the next two in series 32uF 450v for 16uF screens @ 900v handling, the black parts are BY127 Diodes two parallel chains and the other 4 caps are 32uF 450v in series parallel for 32uF 900v handling. Basically a stock JTM45/100 set up. Differences between stock and JH (Dickinson spec.) are the slightly later preamp filtering (32uF and 32 uF vs single 16uF with an extra 10k dropper between them like the '67 spec 100watters, and the tone stack which is 33k/560pF like a split cathode lead amp. I really like it and prefer it over a stock 45/100 even though I generally use splittable humbuckers. Does sound very Jimi with a strat tho'.