Recapping SP600

[Bill Turner, W7TI]

On Mon, 9 Mar 1998 16:54:08 -0800, Chuck Hastings <chasting at EROLS.COM>
wrote:

>Hi to all,
>    I've just begun to troubleshoot a fairly clean, but non-working,
>SP600-JX receiver I bought earlier this month. I have isolated the
>problem to shorted bypass capacitors in the RF deck.  This radio appears
>to be populated with many black plastic, color coded, paper capacitors
>which are prone to fail. A few in the chassis appear to have already
>been replaced. Since disassemby and access is so much work, I think I'll
>go ahead and replace them all while I'm at it.
>    Question, What is the preferred capacitor to use as replacement for
>all those .01 and .022 uf caps?  My first inclination was to use ceramic
>disks at 600 or more volts, but if they will fit what about the
>polypropylene "Orange Drop" Spragues?  Will the 600 Volt ones fit in the
>RF deck or perhaps the 400 Volt versions? I'm just now beggining to
>disassemble it so I'm not sure how much room there will be. Any words of
>wisdom from someone who's undertaken this task?
>                Thanks,
>                Chuck Hastings
>
_______________________________________________________________
I haven't recapped that particular radio, but I've done a bunch of
others, and the Sprague "Orange Drop" is a fine choice.  As you
mentioned, the black plastic caps with color bands similar to
resistors are the worst offenders.  After you remove one, connect it
to a voltmeter.  You'll see it has turned into a tiny battery and is
actually putting out a few millivolts!  Heat them up and the voltage
goes even higher.  

73, Bill W7TI

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