I am the original owner of both units purchased from Audio Dimensions in Royal Oak, Michigan. The classic 60 ( purchased in 1990)has new tubes and caps (less than 100 hours) and was biased every 6 months. The Ls 12 was recently checked by Audio Research and calibrated to specs. Both are in almost perfect condition but because of age I am classifying them as 8.5/10. The Classic 60 is fully balanced with balanced inputs only. I have used these units with a variety of speakers including Quad el63, Magnepans, Celestion and KEF. The sound is phenomenally accurate with a deep wide airy stage. They have never been misused and I am only selling because I am retiring and moving. Whoever is the next owner will have one of the finest sounding systems ever built. If you live in the Detroit area I invite you to come to my home and listen to them.