02-28-2018, 04:32 PM
>Grid 4, pin6 connects to the aerial compensator, also to a 10uuf mica cap, also to the variable (tuning) cap
Close but no cigar! There's no 10 uuf cap there as it's only used in the PT4. #1 and 1A are the rf side of the tuning cap and it's trimmer (1A)
>Grid 1, pin4 connects to pin 1 on osc trans, also to 47K resistor
So far so good.
>also to the osc comp, also to the variable (tuning) cap, also to pin 2 on the osc trans.
Not directly but thru are mystery cap.
Having an oscillator problem??
Close but no cigar! There's no 10 uuf cap there as it's only used in the PT4. #1 and 1A are the rf side of the tuning cap and it's trimmer (1A)
>Grid 1, pin4 connects to pin 1 on osc trans, also to 47K resistor
So far so good.
>also to the osc comp, also to the variable (tuning) cap, also to pin 2 on the osc trans.
Not directly but thru are mystery cap.
Having an oscillator problem??
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
