I recently acquired an early-1970s Kenwood KR-6160 stereo receiver when my brother-in-law cleared out my late mother-in-law's house prior to listing it. It powers up, tunes on the AM and FM bands, and sounds more than decent over headphones. I haven't hooked it up to speakers yet. What do the Kenwood fans on the forum think of this receiver model? Is it trash, a treasure, or something between those extremes?