Harman kardon pm660 vs 6650r

[Richard_James]

Which one is better in terms of power delivery
And sound quality (subjective)

6650r pics attached.
4 63v 8200uF capacitors
Total of 4 c3907 transistors output
Total of 4 a1516 transistors output

Transformer is
Bando 5584-t0801
Bd21a3e-0005


Harman Kardon HK6650R - Manual - Stereo Integrated Amplifier - HiFi Engine

 

[Richard_James]

Pm660 specs

Harman Kardon PM660 - Manual - Hi-Current Capability Integrated Amplifier - HiFi Engine

4 63v 10000uF capacitors

4 2sb755 transistors
4 2sd845 transistors
Transformer is
Bando bd5584-0004
5584-701367

Looks like there is conductive glue around those transistors. Need to remove it
Looks like all elna capacitors on pm660