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Thanks for the suggestions and encouragement!
This time I got no picture on startup, but I did hear a faint whine / squeal, probably from the oscillator circuit (it varied in pitch by turning one of the 3 big wheels slightly).
Measured voltages on some easily-accessible pins after one minute, then shut it down after 5 minutes.
Here are the readings, using the Philco service manual lug IDs and target voltages (from pages 14 and 15):
L11 = +276 (should be +270)
L22 = +269 (should be +400)
L38 = +262 (should be +260)
L40 = +.03 (should be -20)
L46 = +.06 (should be +170)
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