"David Looser" wrote in
message

From the little I can find out about it the SHAC-500
looks like the nearest approximation to what I actually
want. But I've managed to acquire a dead Denon AVR-1705.
The mains transformer has an open-circuit primary and
some of the power transistors are suspect. Apparently it
overheated in use and the owner decided to upgrade,
rather than have it repaired. (according to the manual
it's supposed to shut itself down if it overheats, that
seems not to have worked).
I've just run up the small-signal parts from bench power
supplies and they are OK. So I shall use it, taking the
ouputs from what had been the feeds to the power amps and
with a redesigned, smaller power supply. Still a bit
bigger (physically) than I'd like, and with too many
bells and whistles,but it'll do the job.

Sounds like an effective use of an available resource.

Good luck! ;-)