The BHCs are possibly the 'best' midrange caps available (especially the Slit foils) but a bit 'thin' in the bass (in basic classA amp circuits anyway, IMO) whereas the Epcos are a more balanced sound with quite clearly defined bass in comparison to say, Mundorfs and the other deep-etched thin film electros that are built for smaller size, etc these days
This is just an indication and naturally will vary all over the place but it gives you some idea of the different characteristics
Jensen's also build some really top quality caps for supply purposes - I haven't used many but the ones I've tried have perhaps better detail to the Epcos with about the same bass, particularly the 4 pole version - they're also quite 'friendly' for bypass purposes so would include these in your perusal - not cheap tho ...
IMO, the Rifa's are perhaps the 'fastest' caps on the market and seem to give extra 'punch' to amps but also a bit light-on with the bass so you need to compensate for this a bit - also not as easy to bypass and maybe need to look at R-C snubbers or extra series impedances - can transform a 'slow' amp completely.
I hope my meanderings are of some use - they'll probably attract some criticism as many people use these same caps in a wide variety of ways and can get different results - so are just an broad indication.
As you're just in the design stages of the supply, you might keep the humble C-Multiplier circuit in mind as a very useful and simple 'gadget' that works like a charm - there are a number of designs available on diyAudio threads, and elsewhere, and they pretty much all work the same but with different fets/transistors - the one known as the Complete C-multiplier (an slightly more complicated one) is a stunner for performance without much downsides and there maybe some pcbs still available via the GB section, I think.
Also, as Andrew indicated, using the small supply cap (bypass caps) close to the output devices is a very positive effect and need to be also carefully chosen (generally by 'trial and error' for me!)
Many of us overdesign different sections of power amps and I must admit that I tend to be a bit 'over-the-top' with the power supply area and possibly diverting attention away from other more critical areas - probably because I'm more comfortable playing with power supplies and not the complications of intricate circuit design - each to his own, I guess.
This is just an indication and naturally will vary all over the place but it gives you some idea of the different characteristics
Jensen's also build some really top quality caps for supply purposes - I haven't used many but the ones I've tried have perhaps better detail to the Epcos with about the same bass, particularly the 4 pole version - they're also quite 'friendly' for bypass purposes so would include these in your perusal - not cheap tho ...
IMO, the Rifa's are perhaps the 'fastest' caps on the market and seem to give extra 'punch' to amps but also a bit light-on with the bass so you need to compensate for this a bit - also not as easy to bypass and maybe need to look at R-C snubbers or extra series impedances - can transform a 'slow' amp completely.
I hope my meanderings are of some use - they'll probably attract some criticism as many people use these same caps in a wide variety of ways and can get different results - so are just an broad indication.
As you're just in the design stages of the supply, you might keep the humble C-Multiplier circuit in mind as a very useful and simple 'gadget' that works like a charm - there are a number of designs available on diyAudio threads, and elsewhere, and they pretty much all work the same but with different fets/transistors - the one known as the Complete C-multiplier (an slightly more complicated one) is a stunner for performance without much downsides and there maybe some pcbs still available via the GB section, I think.
Also, as Andrew indicated, using the small supply cap (bypass caps) close to the output devices is a very positive effect and need to be also carefully chosen (generally by 'trial and error' for me!)
Many of us overdesign different sections of power amps and I must admit that I tend to be a bit 'over-the-top' with the power supply area and possibly diverting attention away from other more critical areas - probably because I'm more comfortable playing with power supplies and not the complications of intricate circuit design - each to his own, I guess.
I prefer both. While sound has varied with capacitors to some degree, better decoupling/filter has always been a better improvement. However I have to say Nichicon Gold Tunes literally are just better, and I prefer them in a less optimal setup than I do anything else even more optimal. My days of playing with panasonics, blackgates, etc, are over.
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