I had one of those for a while; not a bad piece; not
really, quite a "true" quad component, though -- it doesn't have any built-in decoders for matrix quad (e.g., QS or SQ) nor CD-4 for (i.e., true 'discrete, compatible" four channel) quad LP records.
It's well built and has a decent FM tuner section in it, as I recall.
That said, it
does have four output power amps (that are bridgeable, according to the catalog ad copy for more power - "Stereomax" - as a two-channel receiver).
source:
http://www.radioshackcatalogs.com/html/1975/h020.html
EDIT: Note that the "60 watts" figure in the ad copy is for all channels driven (i.e., 15 watts per channel in 'quad' mode; probably just about 30 wpc in "Stereomax").
PS - if you buy one, and if it's dirty -- be
extremely careful if you need to clean the front panel. I used Windex on the one I had... and blithely removed some of the volume control 'calibration' markings on the front panel before I realized that the silkscreening on this component, at least after a few decades, wasn't Windex-resistant!