I have an original SM-70 (not the later Pro model) for sale. Sweet little lowish-power zero-feedback "Class A" stereo amp. (i.e. no global feedback, and high-bias class AB). There is a fair bit of info on these around if you search. I had planned to use this in a bi-amp setup on my Yorkville U15's, but there is *just* enough hum to be barely audible on the 98dB/W speakers. When running on my Sapphire XL's there is no problem, though. I'll work to get some pictures if desired, but there isn't much to show - unit is in very nice condition considering the age - no blemishes or scratches.
Asking $250.