12-23-2012, 12:09 PM
Hi Eric
The schematic you have will be for the Code 121 version of the 42-1008. Philco did not issue a revised schematic for Code 122, but they did publish the changes made to the Code 122 version, as follows:
Phono oscillator transformer (16) changes from 32-3785 to 32-3866.
Condenser (56), 0.2 uF, changes to 10 uF, part no. 30-2500.
Resistor (57), 2200 ohms, changes to 3300 ohms, 1/2 watt.
Power transformer (78 ), 32-8129, changes to 32-8217. The new transformer does not have a separate winding for the 7C6 oscillator tube filament. This filament is now connected in parallel with the other 6.3 volt tubes in the set.
Phono input transformer (91) changes to 32-8215.
Tuning shaft is 56-6196 FCP.
Tuning shaft drive cord is 31-2614.
After all of that, note that there is no mention of resistor (12) being changed - so I would replace it with a new 680 ohm resistor.
The schematic you have will be for the Code 121 version of the 42-1008. Philco did not issue a revised schematic for Code 122, but they did publish the changes made to the Code 122 version, as follows:
Phono oscillator transformer (16) changes from 32-3785 to 32-3866.
Condenser (56), 0.2 uF, changes to 10 uF, part no. 30-2500.
Resistor (57), 2200 ohms, changes to 3300 ohms, 1/2 watt.
Power transformer (78 ), 32-8129, changes to 32-8217. The new transformer does not have a separate winding for the 7C6 oscillator tube filament. This filament is now connected in parallel with the other 6.3 volt tubes in the set.
Phono input transformer (91) changes to 32-8215.
Tuning shaft is 56-6196 FCP.
Tuning shaft drive cord is 31-2614.
After all of that, note that there is no mention of resistor (12) being changed - so I would replace it with a new 680 ohm resistor.
--
Ron Ramirez
Ferdinand IN
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