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Here's the basic logic:
Both sets of A-B contacts are in parallel. So turning on either the TV or the radio connects AC line voltage to the power transformer primary.
When the TV -only- is switched on, the C-D contacts on the TV volume switch disconnect the radio circuit filaments of V601,602,603,604,605 and the two radio pilot lights.
When the radio -only- is on, the C-D contacts on the radio volume switch disconnect filament voltage from V101,102,V201,202,203,V301,303,304,306,V403,405,40 6 in the TV circuit.
Is there a TV pilot light I'm not accounting for?
Last edited by Kevin Kuehn; 05-07-2014 at 10:46 AM.
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