Capacitor choice

Hi
I am currently rebuilding a Rotel RB 870 BX power amplifier
there are 3 capacitors i would like to change to a better spec labeled A B C on the schematic
I have attached the schematic and a pic of the original and the possible replacement parts
which would be the best to use ?
Regards Glenn
 

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Why would you change caps if they are ok ? Usually old caps fail around DC , regulators, filtering . Maybe those caps need to be replaced .
Anyway ,
For C , the input cap the wima 1 uf will do, MKP ? . It makes a high pass with the 18k res to ground around 9hz instead of 4hz the original 2.2u , no problem .

For B it seems the original was polarised ± , Same 1uf wima would work , or polar ± 1uf cap too.

For A , I would use Nichicon muse ( green caps ) , or any good brand new cap . original Elna is good quality as well , if not to old and measures badly.

The most difference in audio quality , if any ( if the caps are degraded) would be the input cap C and A the cap for NFB.
 
9Hz -3dB will affect the audio range. 2Hz and below are practiced there. So I wouldn't reduce that capacitor. Let him manage a little with the installation of a larger capacitor. PP is recommended first, but they are big.