From: "Al Parker" 
Subject: Re: [drakelist] Filter Cap on Drake R4A


Hi Peter(s),
    I was going to answer earlier, but was still sorting thru the AM's
email, and breakfat "inturrupted."  It is not terribly difficult to
"re-stuff" the can, but you must pay attn to the size of the discrete caps
used, it varies by mfgr.  I don't think there's enough space to do it
easily and neatly under the chassis with discretes, but they are getting
smaller.   (the transformers in the R-4A/B's do normally run quite warm)
    Earlier responses from Peter, VE3AX, Herbert, DG7MCC, and Ken, WA2LBI,
are all well taken.  I particularly agree with Ken, don't parallel old
caps with new except as a test, and if one section has gone bad, the
others will follow soon.  Also, don't use the old caps' lugs as tie
points, exc. ground lugs.
    Ron, WB4HFN's website:
http://www.wb4hfn.com/DrakeHomePage.htm
has grown into a super site for technical (and other) info.  We all should
access it often when we have any problems.
    You can see my filter cap rebuild at:
http://www.thecompendium.net/radio/filtercap.htm
I also have incl. a section there on AC-3/4 caps, thanks to Mark, K9MRK.
    Lets all continue to help each other to keep those neat Drakes going.
(I just had a call this AM from a local friend who has filter cap problems
in his AC-3, he'll be here in another hour or so.)
73,
Al, W8UT
New Bern, NC
BoatAnchors appreciated here
http://www.thecompendium.net/radio/
http://www.hammarlund.info

----- Original Message ----- 
From: "VE3AX" 
To: "Peter Hoon" ;

Sent: Thursday, March 18, 2004 7:21 AM
Subject: Re: [drakelist] Filter Cap on Drake R4A


>
> Peter:
>
> In addition to Herbert's excellent advice, check out the new additions
to
> WB4HFN's web site and see the post by AL Parker, W8UT, here on replacing
> Drake rx electrolytics.
>
> 73
>
> Peter
> VE3AX
>
> ----- Original Message -----
> From: "Peter Hoon" > >
R4A: It appears that one or more sections of the Sangamo power supply
filter cap are defective, since I measure 5.2 volts p - p with a scope at
the
> > junction of diodes D4 and D5 (156 VDC).  And my power transformer gets
very hot.
> >
> > The cap is in a single aluminum Sangamo chassis mount with:
> > 100 MFD 200 VDC
> > 100 MFD 200 VDC
> > 100 MFD 200 VDC
> > 20 MFD 20 VDC
> >
> > 1)  Anyone have a spare from an R4A they are parting out?
> > 2)  Suggestions for a source for this filter cap from others who have
gone before me.
> > 3)  Have improvisors found discrete caps from a source (pse recommend
one),
> > left the chassis mount unit alone, and mounted these discrete caps
under the chassis?
> > 4) Has anyone actually drilled out this filter cap shell, and mounted
discrete components inside?
> > Any other ideas or comments appreciated.
> >
> > Peter, VE1CHS


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