05-27-2006, 09:44 AM
If you have already replaced wax-paper caps and checked all resistors for proper values (+/-20% max), then this Service Tip from my site may help.
PHILCO SERVICE HINTS & TIPS - NUMBER 26
Oscillator Failure in Model 38
The old, not used "police" band is nothing more than the standard AM band with an extended top end freq range to about 2,000 kHz or so.
You may want to try replacing the mica caps in the front end with exact value repalcements and/or cleaning the mica sheets in the compensating trimmer, part #14, 7, 6 in the Code 121 version. The front end is a more complicated circuit in the Code 123 version, parts are numbered the same.
Be sure you have the proper schematic for your set. You can tell because the early version uses a type 15 mixer and the later, Code 123, uses a 1A6 in the front end.
PHILCO SERVICE HINTS & TIPS - NUMBER 26
Oscillator Failure in Model 38
The old, not used "police" band is nothing more than the standard AM band with an extended top end freq range to about 2,000 kHz or so.
You may want to try replacing the mica caps in the front end with exact value repalcements and/or cleaning the mica sheets in the compensating trimmer, part #14, 7, 6 in the Code 121 version. The front end is a more complicated circuit in the Code 123 version, parts are numbered the same.
Be sure you have the proper schematic for your set. You can tell because the early version uses a type 15 mixer and the later, Code 123, uses a 1A6 in the front end.
Chuck Schwark,
The Philco Repair Bench
[Image: http://www.philcorepairbench.com/images/philog3tiny.gif]
http://www.philcorepairbench.com
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