05-05-2015, 08:46 AM
I wrote this up several years ago and gave it to Chuck to put on his page:
http://www.philcorepairbench.com/tips/svctip44.htm
Only early production 80 sets have the 50 pF cap. Later, Philco changed the IF transformer so that it has a capacity winding instead of the 50 pF cap. If you follow the link in this post and look at the partial schematic there, notice the little curl just above and to the left of the 4 meg resistor (16) - that is the capacity winding which replaced the 50 pF cap.
Yes, your 80 will definitely work better by replacing the 4 meg resistor with a 2 meg resistor.
More 80 mods:
http://www.philcorepairbench.com/tips/svctip43.htm
http://www.philcorepairbench.com/tips/svctip44.htm
Only early production 80 sets have the 50 pF cap. Later, Philco changed the IF transformer so that it has a capacity winding instead of the 50 pF cap. If you follow the link in this post and look at the partial schematic there, notice the little curl just above and to the left of the 4 meg resistor (16) - that is the capacity winding which replaced the 50 pF cap.
Yes, your 80 will definitely work better by replacing the 4 meg resistor with a 2 meg resistor.
More 80 mods:
http://www.philcorepairbench.com/tips/svctip43.htm
--
Ron Ramirez
Ferdinand IN
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