Welcome! I'm new too, I feel like a kid in a candy store here! First, try looking for a chassis number somewhere on the chassis it's self. If you find one, you can enter it in the search box at sams photofact and they most likely will have a schematic for you. And thanks for saving that cool RCA! 
I was looking at the pic you posted, I'm no expert but it may be a '56 or '57
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Kyocera R-661, Yamaha RX-V2200
National Panasonic SA-5800
Sansui 1000a, 1000, SAX-200, 5050, 9090DB, 881, SR-636, SC-3000, AT-20
Pioneer SX-939, ER-420, SM-B201
Motorola SK77W-2Z tube console
McIntosh MC2205, C26
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