Hello Group, I have just acquired a Spectrum SCR 500 receiver in the rack-mount configuration with the built -in power supply. It looks in very good shape for its age (being in the beige panel color , not the black/charcoal newest colors). The problem I have is that I received no documentation with it, It has a six channel crystal switch on it with one crystal installed, 45.0333 MHz. There are no identifiers on any of the boards, or any where else on the unit. I didn't take the boards out to see if marked on bottoms. I would much appreciate any info, schematics, or helpful criticism on this. I am willing to pay for copying and mail charges, just buy outright, or easier yet, any pdf scans to save a tree. Thanks in advance, Nick WB7PEK
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