10-26-2022, 10:27 PM
Hi and welcome to the Phorum.
Ok so what we need to do is find the center tap on the primary of the output transformer. That connects to one side of the field coil. In turn it go to #27 the choke in the HV side of the power supply. The other field coil lead goes to the primary of the interstage audio transformer and the bottom end of #18 the 1/4meg resistor. The two ends of the primary connect each plate of the 71A tubes.
Piece of cake!
https://philcoradio.com/library/images/schem/20b.jpg
Ok so what we need to do is find the center tap on the primary of the output transformer. That connects to one side of the field coil. In turn it go to #27 the choke in the HV side of the power supply. The other field coil lead goes to the primary of the interstage audio transformer and the bottom end of #18 the 1/4meg resistor. The two ends of the primary connect each plate of the 71A tubes.
Piece of cake!
https://philcoradio.com/library/images/schem/20b.jpg
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 it!
Terry
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
