10-09-2022, 10:00 PM
There does seem to be 2 different tone networks used on the code 121 chassis. They don't use the same rotatory switch. It would be much easier to stick with circuit it has rather to convert it to the other. https://philcoradio.com/library/download...%20165.pdf & https://philcoradio.com/library/download...l.%201.pdf All 3 of the code 121's I have are like yours w/the three .003's.
When my pals were reading comic books
I was down in the basement in my dad's
workshop. Perusing his Sam's Photofoacts
Vol 1-50 admiring the old set and trying to
figure out what all those squiggly meant.
Circa 1966
Now I think I've got!
Terry
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
