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Re: [Amps] Results from new PSUD... resistor b4 the B+ filter caps !

To: dezrat1242@yahoo.com, amps@contesting.com
Subject: Re: [Amps] Results from new PSUD... resistor b4 the B+ filter caps !
From: TexasRF@aol.com
Date: Thu, 11 Feb 2010 13:05:29 EST
List-post: <amps@contesting.com">mailto:amps@contesting.com>
Isn't there built in disconnect at the end of an electrolytic capacitor  
that disconnects the guts when they blow up?
 
I have seen shorted oil filled capacitors and boy do they make a mess when  
they puke their oil.
 
73,
Gerald K5GW
 
 
 
 
In a message dated 2/11/2010 12:00:51 P.M. Central Standard Time,  
dezrat1242@yahoo.com writes:

ORIGINAL  MESSAGE:

On Thu, 11 Feb 2010 12:16:44 -0500, "Paul Christensen"  <w9ac@arrl.net>
wrote:

> 2) series R between the rectifier  and filter C for 
>rectifier preservation during a C short;  

REPLY:

Has anyone actually experienced a shorted filter C? Open  C is far more
common, in my experience. 

In more than 50 years of  electronics I have never seen a shorted
aluminum electrolytic cap. I have  replaced hundreds if not thousands
of open ones and I have seen shorted  tantalums on many occasions, but
that's all. I am sure it must happen but  it seems to be exceedingly
rare.

73, Bill  W6WRT
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