I’m going to replace the WIMA type coupling capacitors on some cheap Chi-Fi 300B amps I have coming for my daughter. I’ve purchased some Audio Note copper foil replacements, which are B in this video.
On my crappy iPad speakers I think I preferred E overall, but I would like to know more about the burn in time allowed for this test.
I agree with the below. Our friend the capacitor is the worst performing discrete component for sound quality. Sometimes they even get microphonic:
I swapped the ultra cheap (a few pennies) caps and resistors in my old Quad 2905s. I put in Mundorf and Jansen - the improvement was wonderful; the clarity detail and air all far better
I followed up with an expensive bypass cap (Silver/Gold I think) and that helped again - great upgrade - if a little daunting getting into the guts of them with ‘the 10,000v can kill you’ in mind
I’d like to mention here the ERO Roederstein MKP1841 (now Vishay I think). The 1841 sounds very good and neutral. I’ve used it since the early1990s for coupling, in loudspeaker crossovers, basically everywhere.
I do think though that ‘no capacitor’ is even better! The worst use of capacitors are electrolytics. In a power supply they’re needed, but as coupling in a circuit where there is little or even zero V to block it is really bad!
