If you want to find an old Dyna St-120 for the purpose of having it transformed into a new Insight 170 amp, you need not find a working unit.
All we need is a good chassis, cover, two of the three bare black L-shaped heat sinks, and hopefully the red and black output jacks. Everything else that is original is trashed anyway.
You will end up with a quiet, delightful, and musical 90 watt per channel bulletproof amplifier in a compact useful chassis, complete with a new three year AVA factory warranty.
Not a bad deal.
Note that we will clean the chassis as much as practical, but removing extra holes, un-pitting of the finish, and removing rust beyond repair are not part of the normal rebuild process or cost.
Regards,
Frank Van Alstine