06-29-2018, 03:12 PM
Ok.
A couple of things stick out to me. Pin 4 of the 41 should read - 16vdc. Having +10vdc on it will cause the tube to draw excessive plate current. This maybe why pin 2 only has 112v. If it's a typo your output transformer is trashed, replace it.
The IF adjustments it doesn't really matter where the tuning dial is set. Inject a 370kc signal into the cap on the 6A7 and adjust the four trimmers inside the IF cans for max sound from the spkr w/the generator set @ minimum output. Note two of the four little screws have HV on them so insulate your tuning tool if it's not plastic.
It's not unusual for the grid 1 voltage to vary w/oscillator frequency (as you tune the dial). Typically it's abt -2 or 3 vdc so the .2 would indicate that the oscillator isn't working but since you have a few volts - it would seem to be ok. If you suspect it you can listen for it @ 370kc above the dial reading on another receiver.
GL
A couple of things stick out to me. Pin 4 of the 41 should read - 16vdc. Having +10vdc on it will cause the tube to draw excessive plate current. This maybe why pin 2 only has 112v. If it's a typo your output transformer is trashed, replace it.
The IF adjustments it doesn't really matter where the tuning dial is set. Inject a 370kc signal into the cap on the 6A7 and adjust the four trimmers inside the IF cans for max sound from the spkr w/the generator set @ minimum output. Note two of the four little screws have HV on them so insulate your tuning tool if it's not plastic.
It's not unusual for the grid 1 voltage to vary w/oscillator frequency (as you tune the dial). Typically it's abt -2 or 3 vdc so the .2 would indicate that the oscillator isn't working but since you have a few volts - it would seem to be ok. If you suspect it you can listen for it @ 370kc above the dial reading on another receiver.
GL
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!
Terry
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