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If there is high voltage, then there is -45 volts on the 6DQ6 grid. That goes through the 470K-560K divider to lug 21, looped to lug 40 to the 1.5 meg bias resistor and the .22 uf bias filter. If all those components are good, then the .1 coupling cap or .22 uf bias filter is leaky or the tube is very gassy.
The 100 ohm isolation resistor is not critical as long as it is somewhere in range.
All this assumes there are no wiring errors. I am using the Philco service notes for things that do not show on the attached Sams print so some component designations may not match.
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