12-06-2006, 09:23 AM
Jonathan - welcome! Another free schematic may be found here.
For the early Model 20 with only one or two trimmers:
http://www.philcoradio.com/tech/images/20a.jpg
For the common Model 20 with three trimmers on the tuning condenser gang:
http://www.philcoradio.com/tech/images/20b.jpg
The 20 could be modified to add AVC, but it would frankly be more trouble than it would be worth - removing coil ends from ground, adding terminals to coil forms, etc. Not to mention detracting from the originality of the circuit.
For the early Model 20 with only one or two trimmers:
http://www.philcoradio.com/tech/images/20a.jpg
For the common Model 20 with three trimmers on the tuning condenser gang:
http://www.philcoradio.com/tech/images/20b.jpg
The 20 could be modified to add AVC, but it would frankly be more trouble than it would be worth - removing coil ends from ground, adding terminals to coil forms, etc. Not to mention detracting from the originality of the circuit.
--
Ron Ramirez
Ferdinand IN
