Best of all, these two helped me fix the KLH-20 plus AM that a patient customer brought over for repair six weeks ago, getting my name from the owner of a long-time record shop in town. The owner of the 20 had parents who were opera singers and a tag on the bottom showed it had been two shops before: 1984 in Phila and more recently from a boutique stereo guy nearby whose youthful tech condemns old stuff like this as a business plan for his boss. This character, whom I have never met, needs my sincere thanks for sending folks away, who find their way to me
LOFL. Record shop guy has never sent me a flake in 10 years 
The model 19 (original) and 20 are several years apart, introduced as a sophisticated yet minimalist and compact unit with incredible performance when compared with most other compact stereo systems. One most desirable model is the one with "tulip" stands under both speakers and the unit itself. This customer's model had AM, dated 11-25-70 inside, it was a much improved version adding AM. The Garrard 60 series changer was pretty smeared up with red grease, missing its stylus and Pickering cartridge dirty. This was used heavily judging by this TT and the speakers, equally worn looking but working fine. The speakers need the butyl rubber treatment of surrounds but I will not get myself in any deeper, not even doing the crossover caps, that I need to remove woofers to access
. Long story short, I recapped and coaxed the amp into working without overheating outputs after a quest for knowledge and trial and error, not to mention disassembly and reassembly, not easy. KLH marched to beat of their own drummer. I saw brilliant design features considering the state of SS units made domestically. I will credit a thread on AudioKarma for giving teh procedure to properly adjust bias and balance pots, one of which was bad, the original problem. No tuner work per owner who plays LPs only. The transistor designs were all different between all three sets in my shop, I needed parts from the 19 to fix this one, including the entire record changer, also Garrard.
No manual or clear/accurate schematic was found. Just this one attached, least i can do if you ever encounter one.
so easy to adjust a Garrard.