[madsowry]

Hi All     I'm restoring a 180 and a 190 at the same time cause they use basically the same schematic and their chassis are basically the same too.  The only difference is the 190 uses a 7A6 AVC tube and the 180 doesn't.
Now from what I have read these 40 radios don't perform like the 41s because they don't have feedback.  I saw this in a thread from 2014 by bobk9eui about a modification to put feedback into these 40 radios.  My question is has anyone else tried this mod and were the results as good as he states his was.

Here's the thread: https://philcoradio.com/phorum/showthrea...ght=40-190

 I understand all of the schematic except at the junction below the 220k res. and to the right of the .02 cap,  I don't understand what the symbols at that junction mean.  They just seem to stop.
   
I'm sure there is going to be more questions as I try to restore these 2 radios but this is my starting one.  Any help will be much appreciated.  Thanks

Dick