[R-390] C227? I can't find it - Never Mind

[Barry]

I see where that cap is now.  Kinda hard to miss (he said sheepishly...).  I
got to thinking that a cap of that value would be substantially larger than
the other components in the area and that's when I remember the chassis
mounted cap.   The wire that connects it to the pin is really hidden
underneath all the components and I had to look very hard to see it.

At least I know the 47pF mod was done to this deck.

Sorry for the dumb question.

Barry(III) - N4BUQ

----- Original Message -----
From: "Barry" <N4BUQ at aol.com>
To: "R-390" <R-390 at mailman.qth.net>
Sent: Monday, March 28, 2005 9:23 PM
Subject: [R-390] C227? I can't find it


> Hi,
>
> I'm still working on this Amelco RF deck.  I got to looking at the
> modification that adds a 47pF cap across the 0.047uF cap (from cathode to
> ground) on the first RF amp (V201).  For some reason, the 47pF (dogbone)
cap
> is there, but the 0.047uF cap isn't.  Has anyone seen this before?
>
> According to TM 11-5820-358-35, C227 is supposed to "prevent cathode
circuit
> degeneration."   I'm not sure exactly what that means.  Was this cap
> intended to prevent the tube from oscillating?  Should I be concerned that
> it is missing?
>
> Thanks,
>
> Barry(III) - N4BUQ
>
> _____________________________________________________________
> R-390 mailing list
> Home: http://mailman.qth.net/mailman/listinfo/r-390
> Help: http://mailman.qth.net/faq.htm
> Post: mailto:R-390 at mailman.qth.net
> Unsubscribe: http://mailman.qth.net/mailman/options/r-390
>