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Think this comes from an early top loading VCR. It's a lot more probable that it only has one power rail and takes both line level audio and video (if I owned the VCR it goes with I'd be rather mad if the RF didn't contain sound) input and has RF output.
Pin 4 is most likely RF out.
What you need to do now is find B+... It'll connect via resistors and chokes to multiple transistors and have capacitive filtering.
Audio and video should just have capacitors coupling them to 1 transistor each.
If I could identify B+ I'd work it from positive 5-12V (watching current draw), hook a TV to pin 4 and touch composite video to the 2 remaining input pins to figure out which is which.
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