From: "Ken, WA2LBI" 
Subject: Re: [drakelist] Filter Cap on Drake R4A


Al,

That is a good point you made about not using the lugs of the old cap for tie
points. I do make safe use of them, however, as supports for terminal strips.
After you remove ALL wires from the cap lugs you can solder the mounting
"foot"
of a terminal strip to one of the capacitor lugs. If the "foot" also has a
solder lug be sure to cut it off so you won't be tempted to use it. You can
also cut off the lugs of the defective can capacitor to give you more room
under the chassis for mounting the new, smaller replacement caps.

Ken, WA2LBI
wa2lbi{at}arrl.net

Quoting Al Parker :

>
> 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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