[Boatanchors] 2013 myth

[Bill Cromwell]

On 07/07/2013 09:42 AM, J. Forster wrote:
> I would actually like to see some data on BB's. And I do not mean
> measuring those that have been removed because they have failed, which
> will obviously badly skew the stats.
>
> Do they, in fact, fail more than other similar caps of the same vintage?
>
> -John
>
> ===========
>

Hi John,

That's on my mind, too and it's why I asked. Some of the messages I have 
read BB and other paper caps were tested after a "shotgun" replacement 
and all found to be bad. Leakage has two different meanings in these 
discussions. There is electrical leakage that can pull down the B+ or 
apply DC voltage from a preceding stage. There is mechanical leakage 
when oil and goo escape from the capacitor body. Some hams have 
testified that goo covered caps sometimes were still working well as 
caps. The suggestion is that BB caps fail more often than others. The OP 
in this thread says "not so".

There haven't been very many hard numbers.

73,

Bill  KU8H