02-05-2008, 10:56 PM
Hi Harlan
There should be around 165 volts on the plate of the 7C6 when the set is in "radio" mode (pushbutton, AM or shortwave); 140 volts in "phono" mode.
(I say "around" because the voltages were originally measured at the factory with 1000 ohms/volt voltmeters which are nowhere near as sensitive, or as accurate, as today's high-impedance meters which do not load down the circuits under test as the old meters did.)
Check to see if mica condenser (66) is shorted. Barring that, the 7C6 itself could have an internal short, or a short on/in the 7C6 tube socket itself. The original resistor probably cracked because of the short which you must now find.
There is a voltage table in the Philco Service Bulletin for this model. You should get a copy from Chuck...available for a reasonable fee.
http://www.philcorepairbench.com/schematics.htm
There should be around 165 volts on the plate of the 7C6 when the set is in "radio" mode (pushbutton, AM or shortwave); 140 volts in "phono" mode.
(I say "around" because the voltages were originally measured at the factory with 1000 ohms/volt voltmeters which are nowhere near as sensitive, or as accurate, as today's high-impedance meters which do not load down the circuits under test as the old meters did.)
Check to see if mica condenser (66) is shorted. Barring that, the 7C6 itself could have an internal short, or a short on/in the 7C6 tube socket itself. The original resistor probably cracked because of the short which you must now find.
There is a voltage table in the Philco Service Bulletin for this model. You should get a copy from Chuck...available for a reasonable fee.
http://www.philcorepairbench.com/schematics.htm
--
Ron Ramirez
Ferdinand IN
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