[AMRadio] Paper caps in your Globe Champ

[Bob Macklin]

You don't even need a capacitor tester. Pull the tubes and use a VOM to 
measure the leakage. You can also use a VTVM.

Bob Macklin
K5MYJ
Seattle, Wa.
"Real Radios Glow In The Dark"
----- Original Message ----- 
From: "JAMES HANLON" <knjhanlon at msn.com>
To: <cw_de_n5op at sbcglobal.net>
Cc: "AMradio" <amradio at mailman.qth.net>
Sent: Tuesday, March 15, 2011 12:10 PM
Subject: [AMRadio] Paper caps in your Globe Champ


> Kim,
>
> I would disagree about your needing to replace the paper caps in your 
> Globe Champ.  I have restored something like 40 vintage receivers and more 
> transmitters than that, and my experience is that paper caps do not all 
> reach end of life within the life span of your Champ.  If you have a 
> condenser checker, you might want to disconnect a sample cap and measure 
> it for leakage.  An alternate would be to measure its resistance with a 
> high range dvm.  Most paper caps are impregnated with wax.  If the cap has 
> significant leakage it will get warm and that will cause the wax to flow 
> into a blob on the bottom of the cap body or possibly even to drip down 
> the the bottom cover underneath it.  Look for signs like that on the caps 
> in your rig.  If you don't find any sign of leakage or of wax flow, I 
> would not bother replacing them on a wholesale basis.
>
> There are a few exceptions.  There are "black beauties," black plastic 
> molded tubular caps, that have a bad reputation for failing shorted.  If 
> the Champ was built with them I would replace them.  Hammarlund used them 
> in my SP-600, and they all failed over a short period of time after I 
> started using the receiver.
>
> If you need a consult, I'm available.
>
> 73,
>
> Jim Hanlon, W8KGI
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