Krell KSA 50 PCB

Here is schematic.
 

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  • krell50.jpg
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I'm working on a KMA 160, which is interesting to constrast with the KSA schematic you posted. For one thing the KMA has an (unprotected) FET input. For another, the KMA uses a regulated supply for the front end and a separate bulk supply for the output.

What's the timeline? When was the KSA 50 made? The KMA 160 is from 1989.