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

[Roger]

Bill, W6WRT wrote:
> 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. 
>   
Ohhh...Yahhhh! They are loud too<:-))
The first one was in a fairly new Dentron DTR-2000. Actually it was in a 
lower voltage circuit. It blew the can right off the cap. The *empty* 
can hit the top of the amp so hard it squashed down. It looked a lot 
like a 38 wadcutter that had hit something really solid. <:-)) The can 
started life at roughly 5/8" to 3/4" in diameter and about 1" tall.

73

Roger (K8RI)
> 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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