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

[Carl]

How many would you like me to send from well known commercial amps?

I always save various failed components as a teaching aid to those not 
familiar with amplifier service.

Carl
KM1H


----- Original Message ----- 
From: "Bill, W6WRT" <dezrat1242 at yahoo.com>
To: <amps at contesting.com>
Sent: Thursday, February 11, 2010 1:00 PM
Subject: Re: [Amps] Results from new PSUD... resistor b4 the B+ filter caps 
!


> ORIGINAL MESSAGE:
>
> On Thu, 11 Feb 2010 12:16:44 -0500, "Paul Christensen" <w9ac at 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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