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Bah, I just got to work on this set, and it looks like the transformer is toast. I had pulled the rectifier and powered it up to see if the filament string was still good, and just as quickly powered it down when I didn't see any filament glow. A dim bulb test revealed a shorted transformer. Ohming it out, it looks like the filament string secondary is the problem.
Let this be a lesson in plugging in a questionable set! As found, the 5Y3 was burned up, and the power resistors coupled to the electrolytics were blackened, one had even blown apart! My guess is that someone in the past powered it up, and left it powered up, as smoked rolled out of the chassis, waiting for a picture to come up.
It's a shame, too. This had a very nice replacement crt, with a date code of 1952. It tests practically new.
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