Thanks, Nando!
Since you know the line so well, what would be a decent, not TOTL, 1979 cassette offering to compliment it (if I don't go Teac)?
And I'm planning to go through the unit today. It sounds fine but I found an overhaul video on YouTube and it was pretty basic. In that particular unit, distortion on one channel was cured by tightening the mount screws of the heat sink (which is the ground for the Darlingtons I believe), and the scope trace sharpened right up. Since it works fine, I'll just clean the pots and tuner variable capacitor; deox the ground traces of the same, wash the pots out and add some D100, and check the heat sink screws. None of the pots are making noise (today), but no reason not to go through it, while the hood is open. The "wood" (vinyl) finish is rough so I'm contemplating some real wood veneer to replace it. Maybe rosewood, if the price is reasonable...
All knobs will get the usual ultrasonic bath in 90% isoporpyl to remove THC and corona.