previously i’ve tried a few things to improve the bass response/low end from my 2204 clone kit build. - resonance control installed (4700pf cap). - phase inverter output coupling caps increased to 47nf, then 100nf (didn’t make much difference from 47) - changed EL34 to KT77 (very pleased with this change) - changed 1st bright cap (goes to gain knob) from 470pf to 2200pf (not sure if this affects bass response much, but thought i should mention it anyway) (also done a few other things as well, jose mv, zener diode clipping, 330k plate resistor at 1st gain stage, V2a cathode bypass cap-0.68uf added, NFB resistor changed from 100K to 39K - from 4ohm pin). these have been welcome and fun changes, but i’m still not satisfied with the low end response. especially after i picked up a peavey windsor (100w EL34 marshally knock-off thing) the other day for super cheap, and compared it to my 50w 2204/800 clone, and its bottom end response and massive tone just stomped my 50w and i found this quite unsettling. i understand that im comparing 50w to 100w, and of course they’ll sound different. but i just couldn’t believe how big the difference was. this has lead me to reading and comparing various schematics and pondering where it is my 50w clone could be lacking. well tonight it just occurred to me that there is a significant difference in the first filter cap stage that directly feeds the OT centre tap (50uf+50uf - 50w; 100+100 - 100w) it also occurred to me that my other 40W SLO-inspired build has larger filter capacitance at this stage (80+80) and has a noticeably better low end response than my 50w. also noticed another peavey amp i like (5150) has enormous filter capacitance at this point too (330uf). so this has me thinking, maybe i just need to increase the filter cap size on that first filter stage and it might just give me what i’m looking for... could i just change that first 50+50 filter cap can to a 100+100 cap can? would this cause any issues? should my 50w heyboer power transformer handle it ok? i’m super keen to give it a try, doesn’t really cost that much to get hold of one..