02-28-2021, 05:46 AM
All my votage measurements were to chassis. Let me go back and remeasure to "B", as you did (how did you decide to use "A" filament center tap?).
I also fed 1400Hz to the antenna, and got nothing. I then fed it to one side of the volume control, and got a very strong signal. I then attached an 18" wire to the volume control, and got strong station reception, but adjusting the trimmers on the 3 variables was squirly, cutting in and out. I'm going to go back and replace the mylar on all three trimmers. And even though both sides of the antenna coil ohmed out good, it looks like there might be a problem there, as well. I'll pull it out and check it. Someone tried to re-cap this unit in the past, and did a really bad job. Lots of flying connections, cold solder joints, wrong wiring, etc.
Maybe all the voltages are O.K., it's just that we were using the wrong point for reference.
I also fed 1400Hz to the antenna, and got nothing. I then fed it to one side of the volume control, and got a very strong signal. I then attached an 18" wire to the volume control, and got strong station reception, but adjusting the trimmers on the 3 variables was squirly, cutting in and out. I'm going to go back and replace the mylar on all three trimmers. And even though both sides of the antenna coil ohmed out good, it looks like there might be a problem there, as well. I'll pull it out and check it. Someone tried to re-cap this unit in the past, and did a really bad job. Lots of flying connections, cold solder joints, wrong wiring, etc.
Maybe all the voltages are O.K., it's just that we were using the wrong point for reference.
