The only caps I haven't replaced or bypassed in my S.E.X. are the following:
A --- 2x 100uf 450V
B --- 2x 220uf 250V
C --- 2x 22uf 450V (currently bypassed with .22uf film caps, but see below)
With regard to (A) and (B), I initially didn't plan on making any changes to these caps, since they aren't directly in the signal path and weren't recommended changes. But I recently replaced all 3 220uf 250V electrolytics in the power supply of my Speedball'd Crack with 200uf metalized polypropylene film caps. I can't explain it, but I feel like the change is distinctly audible, much bigger than I ever would have expected. Frankly, I was really sort of shocked, since I wasn't expecting much of an audible difference. Bass seems much stronger and resolution (if possible) seemed to get even better than it was before. Best of all, the cost was surprisingly low.
So I am now revisiting my decision to leave the 100uf and 220uf electrolytics listed above for (A) and (B) in. I've been considering replacing the 100uf electrolytics with oil-filled 100uf motor run caps, and replacing the 220uf electrolytics with 200uf metalized polypropylene film caps. I would have to mount the caps externally and run fly leads to them. The voltage ratings would be equal to (or exceed) the voltage ratings on the stock electrolytics.
My questions are as follows:
1. Putting cost aside (again, the cost is fairly minimal), is there any reason not to do this? Is there a chance the fly leads will cause problems?
2. With regard to (A), is there any reason why oil-filled motor run caps are a bad idea in this position?
3. With regard to (B) is there any reason why films caps are a bad idea in this position?
4. Again with regard to (B), are 200uf film caps sufficient, or should I use 250uf caps instead? The price difference is negligible. Or do the caps really need to be exactly 220uf?
5. With regard to (C), rather than just bypassing them (as is currently the case), I plan on replacing them with 20uf 630V film caps. Is 20uf acceptable or is the 22uf crucial?
6. Again with regard to (C), should I couple the 20uf caps with 2.2uf caps wired in parallel to get closer to 22uf in total capacitance? (I already have all of these caps, so extra expense is not an issue.)
Best regards,
Adam