[R-390] Cap Question

[Barry]

I should clarify.  My RF deck has the original brown beauties in it.  I just
used the picture as reference to show which caps I was talking about.  I
agree: these look like they are replacements.

In my first RF deck rebuild, I replaced these with 400V Orange Drops, but
they were a real pain to position and I was wondering if ratings like this
are needed in this circuit.

Thanks,

Barry(III) - N4BUQ

----- Original Message ----- 
From: "Cecil Acuff" <chacuff at cableone.net>
To: "Barry" <n4buq at aol.com>; <R-390 at mailman.qth.net>
Sent: Wednesday, March 16, 2005 9:42 AM
Subject: Re: [R-390] Cap Question


> Looks to me like they have already been replaced.  Someone may have just
> used what was on hand.  Looking at the solder joints and the insulating
> tubing it looks like recent (relative) work.  Maybe from a Mil. Overhaul.
>
> Cecil...
>
> ----- Original Message ----- 
> From: "Barry" <n4buq at aol.com>
> To: <R-390 at mailman.qth.net>
> Sent: Wednesday, March 16, 2005 9:24 AM
> Subject: [R-390] Cap Question
>
>
> > Looking at the caps in my "new" R390A RF deck, I'm considering replacing
> > the
> > three brown beauties in it.  I'm curious, though, about two of them.
They
> > are used in the heater thermostat circuit of the crystal oscillator can.
> > In
> > the picture referenced below (thanks, Don), they are the big, yellow
ones
> > in
> > the upper right corner:
> >
> > http://militaryradio.com/Images/390rfd.jpg
> >
> > The heater voltage is 6.3VAC and I'm wondering why the designers used
400V
> > or better caps here.  Is this necessary because the noise spikes are
> > considerably larger than 6.3V or is it possible that these were just
handy
> > since there were so many other 0.1mfd @ 400V caps used in other places
in
> > the radio.
> >
> > Any comments?
> >
> > Thanks,
> >
> > Barry(III) - N4BUQ
> >
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