Another option is a used class A amp,
-Luxman L series from the early 80's they are quite good and reasonable cost. also one of the higher powered class A amps out there at 50wpc. they also do not go into class AB/B. L530,L540,L560 these amps are the predecessor to the new production Class A amps like the L590axii. note the L560 was the last and best but rare outside Japan, i had one and its very good if you can find one (110v though).
-Older Pass alpha series.
-older krell
-sungden of course.
Cheers.
glen