01-08-2019, 01:35 PM
>My 16b has the four position tone control (#79) with the external Bakelite cap (#78).
Good that's the better of the two designs.
>This means that the plate of the 1st AF stage is always in the circuit
Yes it has to be or the audio signal would end there.
> instead of being switched-in only when the tone control is in the fourth position.
The last position grounds the .006 cap thus cutting off some of the high frequency response.
>And could that be the reason the insulation has deteriorated so much?
No looks like old age/rubber coated wire.
>What gauge wire should I use?
Not particularly critical not much current flow. 22 or 24Ga is fine (pretty standard size for hookup wire).
Sorry for the large text laptop has gone nutz and didn't want to retype.
Good that's the better of the two designs.
>This means that the plate of the 1st AF stage is always in the circuit
Yes it has to be or the audio signal would end there.
> instead of being switched-in only when the tone control is in the fourth position.
The last position grounds the .006 cap thus cutting off some of the high frequency response.
>And could that be the reason the insulation has deteriorated so much?
No looks like old age/rubber coated wire.
>What gauge wire should I use?
Not particularly critical not much current flow. 22 or 24Ga is fine (pretty standard size for hookup wire).
Sorry for the large text laptop has gone nutz and didn't want to retype.
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
![[-]](https://philcoradio.com/phorum/images/bootbb/collapse.png "[-]")
