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By the looks of the schematic the pilot lights aren't running off the tube filaments, they're running off the mode switch?!
I measured the resistance on the power cord with the radio turned on and the radio unplugged and the cord measures open (the meter starts off at about 2.2 MOhms and then works its way up to an O.L. reading).
So then how the heck would the AC side of the power transformer suddenly just go open without me doing anything to the radio?
Radio schematic posted below.
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