I tried a lot of different caps for psu. elna audio, nover,panasonic and now mundorf Mlytic HC 80 volt 47.000uf. I bought 2 pieces and made my own POWER PSU. Bass super, perfect mid,great high tone. makes my L20 amp very precise and dynamic.
Best upgrade to buy for your diy amp. I never thought the difference is so huge. i use also 2x mundorf 1,0uf mcap as filter between + and - pole on each capacitator. That impoves sound also.