I concur that the Hafler (DH-220) holds up sonically, and reliably.
A couple years earlier (late 70s), the Tim de Paravicini Luxman tube MB-3045 holds up sonically, but NOT in terms of reliability. His SS preamp, the C-1000, does in both respects.
A couple years earlier (late 70s), the Tim de Paravicini Luxman tube MB-3045 holds up sonically, but NOT in terms of reliability. His SS preamp, the C-1000, does in both respects.