09-08-2015, 12:52 AM
I recently worked on a 37-640 which had two small wires in the 1st IF can too. THey were not shown in the schematic but are mentioned in the production changes
"The first I.F. Transformer, Part No. 22-2274 has a stabilizing winding which is placed n series with the suppressor grid of the 6K7G I.F. tube"
It's drawn in on this schematic as the squiggle going up to ground.
"The first I.F. Transformer, Part No. 22-2274 has a stabilizing winding which is placed n series with the suppressor grid of the 6K7G I.F. tube"
It's drawn in on this schematic as the squiggle going up to ground.
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
