Just a small correction- the J2 does have negative feedback.
OP: Ayre and DarTZeel are the two A/B amps (cooler) that don't use negative feedback. The latter has a new integrated with built-in DAC which might interest you.
OP: Ayre and DarTZeel are the two A/B amps (cooler) that don't use negative feedback. The latter has a new integrated with built-in DAC which might interest you.