12-04-2023, 09:10 PM
Hi and welcome to the Phorum,
Here's a couple of things that may make it easier to work on.
https://philcoradio.com/library/images/schem/90a.jpg
https://philcoradio.com/library/download...n%2056.pdf
Methinks you are correct that the two sections are switched, the 5k should be controlling the ant section and the 250 ohm section controls the bias on the rf/if tubes.
GL w/your project! I'm working on a early model 70 which uses the same setup.
Here's a couple of things that may make it easier to work on.
https://philcoradio.com/library/images/schem/90a.jpg
https://philcoradio.com/library/download...n%2056.pdf
Methinks you are correct that the two sections are switched, the 5k should be controlling the ant section and the 250 ohm section controls the bias on the rf/if tubes.
GL w/your project! I'm working on a early model 70 which uses the same setup.
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 "[-]")
