Re: 2445A slow


Brad Thompson
 

Chuck Harris wrote on 4/3/2020 10:48 AM:

Unfortunately, it doesn't always work that way.
The caps tek used leak through the lead seals long
before they cease being good enough to meet the
ripple specs.

I think the capacitor manufacturer knew that leakage
was going to be a problem, because in addition to the
usual rubber lead seal, they filled the area after the
seal with red, or black epoxy.
<snip>

Hello--

IIRC, at one of my former employer's facility, the solder flux-remover solvent in use at the time attacked
conventional electrolytics' rubber end seals. The epoxy end seals prevented the damage
but those capacitors were more expensive. Again IIRC, the PC-board manufacturing process changed to
a different flux and solvent that didn't attack the rubber end seals.

73--

Brad  AA1IP

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