Kenwood 600T(1976, $650,front,back,Euro back,inside 1,inside 2,back with amp,brochure,ad,block diagram,schematic 1,2,3,4,detailed specs, detector/MPX scheme: pulse count detector, charge injection cancellation discrete MPX switches, MPX PLL generated 38k with HA1156 chip)search eBay ...
Kenwood VR-517 Stereo Receiver User Manual 1 / 2