07-24-2017, 12:17 PM
Hi John and welcome to the Phorum,
Back in years gone by the common standard voltage values used in receivers for foil/paper caps were 100,200,400, and 600v. Every once in a while you might see a 1000 or 1200v job. These higher voltage one would be located across the primary of the audio output transformer or in farm sets used in the vibrator power supply. A lot of times those might be micas.
If you like for #39 you can use two .02mfd @ 630v in series for the .01, this will equal .01@1260v. For the .02 you can use two .047's @ 630v to equal .0235mfd @ 1260v.
In some circuits that cap is wired across the primary of the output transformer so if it shorted it doesn't really do any damage. In this one if it shorts it take the transformer w/it.
Back in years gone by the common standard voltage values used in receivers for foil/paper caps were 100,200,400, and 600v. Every once in a while you might see a 1000 or 1200v job. These higher voltage one would be located across the primary of the audio output transformer or in farm sets used in the vibrator power supply. A lot of times those might be micas.
If you like for #39 you can use two .02mfd @ 630v in series for the .01, this will equal .01@1260v. For the .02 you can use two .047's @ 630v to equal .0235mfd @ 1260v.
In some circuits that cap is wired across the primary of the output transformer so if it shorted it doesn't really do any damage. In this one if it shorts it take the transformer w/it.
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
