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Hi Bob!
I'm not too familiar with that set but I'll take a shot in the dark. Is there a n extra switch hooked to the power switch on the tv section of the unit? One of my Zeniths uses a setup like that, when you turn on the tv it switches the speaker lead to the tv and back to the stereo when the tv is off. But that is a '65 color roundie, yours could be much different. I haven't had the pleasure of working on a Zenith porthole from that era so this is just a guess. Were there speaker wires in there before you took it apart or was it missing them? I'll do some research on it for you. John Marinello may be able to help you as well, Zenith Portholes are his forte.
Mark
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