12-06-2019, 08:36 PM
Hi Forest,
>I didn't think a couple of turns would make that much difference
As Nippsey Russell use to say "Oh Yeah!". With the feedback coil open two things happen. Since the cathode isn't grounded anymore the 77 mixer tube isn't going to do much of any thing. The other thing is that with out any feedback the oscillator isn't going to run. This means that there is no frequency conversion ( from the frequency of the dial to 460kc ). The other 77 is looking for a signal @ 460kc and it's getting a weak signal @ the frequency that the dial sez. This is why the tuning is broad. Oh I think the Kingfish said it a few times too when scamming Andy into a scheme.
>I think I counted 14 turns
I'd trust your counting over my memory!
>trying to wind by hand or fix to a variable speed drill at real low speed
By hand. I do reserve some winding to the drill but this is pretty quick and easy. Have used the drill for rewinding a few Philco shadow meters which is abt 1200' of #40 Ga wire.
For those following at home the 37-84 code 121 is the same as the older 84 1934-36.The late alliteration of the 84 was the 37-84 code 122 which is the same set with octal tubes. Pretty sure both used the same photofinish cabinet along w/a few others.
Obtw GL is the abbreviation for good luck. Name is Terry it happens all the time not a problem.
>I didn't think a couple of turns would make that much difference
As Nippsey Russell use to say "Oh Yeah!". With the feedback coil open two things happen. Since the cathode isn't grounded anymore the 77 mixer tube isn't going to do much of any thing. The other thing is that with out any feedback the oscillator isn't going to run. This means that there is no frequency conversion ( from the frequency of the dial to 460kc ). The other 77 is looking for a signal @ 460kc and it's getting a weak signal @ the frequency that the dial sez. This is why the tuning is broad. Oh I think the Kingfish said it a few times too when scamming Andy into a scheme.
>I think I counted 14 turns
I'd trust your counting over my memory!
>trying to wind by hand or fix to a variable speed drill at real low speed
By hand. I do reserve some winding to the drill but this is pretty quick and easy. Have used the drill for rewinding a few Philco shadow meters which is abt 1200' of #40 Ga wire.
For those following at home the 37-84 code 121 is the same as the older 84 1934-36.The late alliteration of the 84 was the 37-84 code 122 which is the same set with octal tubes. Pretty sure both used the same photofinish cabinet along w/a few others.
Obtw GL is the abbreviation for good luck. Name is Terry it happens all the time not a 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
