08-11-2021, 08:43 AM
It's been a while since I've worked on a '40 model but there should be 2-3 wires connecting the pb assy to the band switch. Unsolder those and unbolt assy maybe a ground strap to disconnect too. Remove it and set it a side for now you have a clear path to get to IF and mixer stages.
Check and see if you have plate and screen grid voltage on the rf,mixer, and IF amp tubes.
For the squeal try reversing wires on pins 5 and 6 on the opt. Typically it doesn't matter but maybe that inherently different about the transformer. Not to worry it may have to do with there is no audio signal too.
Check and see if you have plate and screen grid voltage on the rf,mixer, and IF amp tubes.
For the squeal try reversing wires on pins 5 and 6 on the opt. Typically it doesn't matter but maybe that inherently different about the transformer. Not to worry it may have to do with there is no audio signal too.
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 "[-]")
