04-08-2017, 05:23 PM
Schematics:
Tuner and power supply - Click Here
Stereo amplifier - Click Here
Here's the power supply - click to enlarge.
[Image: http://www.philcoradio.com/images/phorum...s01_sm.jpg]
As you can see, with R19 open as it is, no B+ is going to get to the stereo amplifier. Point Z goes to the center taps of the audio output transformer primaries (and from there to each of the 7189 plates); point Y goes to the 7189 screen grids. Point Y also serves as the B+ source for the rest of the amplifier section.
Tuner and power supply - Click Here
Stereo amplifier - Click Here
Here's the power supply - click to enlarge.
[Image: http://www.philcoradio.com/images/phorum...s01_sm.jpg]
As you can see, with R19 open as it is, no B+ is going to get to the stereo amplifier. Point Z goes to the center taps of the audio output transformer primaries (and from there to each of the 7189 plates); point Y goes to the 7189 screen grids. Point Y also serves as the B+ source for the rest of the amplifier section.
--
Ron Ramirez
Ferdinand IN