05-05-2020, 03:10 PM
Not a problem. The reader's digest version of Rod's post abt the avc is that on pin 4 of the 7A8 you should w/a strong station -10vdc or so. With a weak station the voltage is going to be less - so maybe -5vdc. The less - it is the more the mixer tube (7A8) and the 7B7 IF amp tube will conduct. When they conduct more weak signals become louder. And vise versa.
I'm thinking that it's a open ant coil or IF transformer. Both of these could pass some signal but not all giving poor performance. A weak tube or a stage miss aligned could be the issue too.
Just for grins if you happen to have spare tuning cap try connecting one section in parallel with the ant section in the set. Tune the added cap to see if there is a peak in signals.
GL
I'm thinking that it's a open ant coil or IF transformer. Both of these could pass some signal but not all giving poor performance. A weak tube or a stage miss aligned could be the issue too.
Just for grins if you happen to have spare tuning cap try connecting one section in parallel with the ant section in the set. Tune the added cap to see if there is a peak in signals.
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 it!
Terry
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