Hello Harmon,
I had one of the 70 stereo units in about a year and a half ago for modifications and obviously spent some time listening to them before opening them up. I will have to agree with others in that they are wonderfull amplifiers. Yes, they do run a bit hot but the 35'ish watts did a very nice job with various speakers I hooked up to it.
I would be interested in hearing a mono bloc setup with a bit more juice and current.