[R-390] R-390A IF deck caps in T501 or T502

[Larry H]

Jacques,  I should have included that.  It's a 1962 contract Amelco, so I
assume will be different.  I wonder if there are more than 2 styles.

Bill,  Thanks for the offer.

I am also surprised that a cap is bad in the IF can.  I measured the
resistance of both coils to be 5.25 ohms, so I don't think it's shorted,
but I don't have an inductor analyzer to know for sure.  They are .5" in
outside diameter and .25" high.

The other cap is 39 pf, so if the bad mica is 15 pf, that is a total of 54
pf on each coil.  Does that seem low for a 455 kh resonance?  I'm going to
plug these numbers into an inductance and resonance calculator and see what
it says.

Regards, Larry

On Sun, Jan 13, 2019 at 3:11 PM Jacques Fortin <jacques.f at videotron.ca>
wrote:

> Larry, who made your IF deck ??
> I have a couple of loose parts T501/502 and I can look at, but they came
> from an early Collins IF deck.
> I already seen different coils/caps in a Capehart one.
>
> 73, Jacques, VE2JFE
>
>