Hi,
some useful information and some confusing regarding the amps.
if you speek about "brand x" Amps compared to "Brand Y" please
don´t forget the modell number. Also Branx X modell 555 compared to an Amp of Brand Y doesent help much.
Because every model seems to be different. Every Manufactured did some good and a lot of poor sounding amps.
greetings
andreas