08-07-2021, 12:10 PM
AFC (Magnetic Tuning) Won't work and I'm a bit confused. What/were (physically) is switch part #135?...
I'm almost done, except the magnetic tuning doesn't work. The IF alignment seemed to go well, things peaked, etc.. The tube voltages look sane. My suspicion is centered around the switch, part #93.
- When OFF points "A" and "B" measure grounded - GOOD.
- When ON points "A" and "B" have a ~2ohm resistance between them - BAD - I think.
But, before I go and fool with the Magnetic Tuning switch (93), I need to figure out what the switch below it, part 135 (or so it says) is supposed to be.
Switch 135 seems to be able to connect points "A" and "B". So, maybe why I see the ~2 ohms (seems a bit high)?
What doesn't make sense is that Ride's lists part 135 as "Pilot Lamp (Codes 121-122). I don't think so.
The text below the arrow at the bottom of the schematic says "USED IN CODE 122 ONLY" (chopped it off).
I'm almost done, except the magnetic tuning doesn't work. The IF alignment seemed to go well, things peaked, etc.. The tube voltages look sane. My suspicion is centered around the switch, part #93.
- When OFF points "A" and "B" measure grounded - GOOD.
- When ON points "A" and "B" have a ~2ohm resistance between them - BAD - I think.
But, before I go and fool with the Magnetic Tuning switch (93), I need to figure out what the switch below it, part 135 (or so it says) is supposed to be.
Switch 135 seems to be able to connect points "A" and "B". So, maybe why I see the ~2 ohms (seems a bit high)?
What doesn't make sense is that Ride's lists part 135 as "Pilot Lamp (Codes 121-122). I don't think so.
The text below the arrow at the bottom of the schematic says "USED IN CODE 122 ONLY" (chopped it off).
Can't think of anything witty.
Greg O.
Whitehall, PA
