The WSR7, MRA5 (receiver, amp) combination was used in the Seeburg
100-R. Would anyone be willing to email me a schematic of at least
the amplifier (PDF file?). I was going to model the amp using PSpice.
This would allow me to test various design alternatives. I would
then likely breadboard the best design and see how it tests. I've had
some experience with SET (Single Ended Triode) amps. I want to beyond
just simply swapping out the capacitors with modern equivalents.

Fred