[Hallicrafters] Recapping Hallicrafters

[EXT-Craft, Clifford H]

I have replaced many electrolytics in microphones and other things where the voltage across them is only 2 volts or so and rated at 50 volts. They measure only a few pf after a few years. Same goes for power supplies, many used the "high grade" comupter caps rated at 35 volts or so on 13 volt supplies which faded to nothing after a few years. I started over 40 years ago and now work on some of the oldest equipment here at what used to be boeing wichita and see what some "engineers " put in equipment that will not be reliable for long due to the caps fading.
Cliff craft WA0ROX                                                         

-----Original Message-----
From: Mike Everette [mailto:radiocompass at yahoo.com] 
Sent: Tuesday, July 12, 2005 2:19 PM
To: Clayton L. Nicolsen; Hallicrafters at mailman.qth.net
Subject: Re: [Hallicrafters] Recapping Hallicrafters




--- "Clayton L. Nicolsen" <cnicolsen at msn.com> wrote:

> "One mistake some make is replacing electrolytic
> caps with one of a higher
> voltage, this will accelerate the aging of the cap.
> 
REST ASSURED!  THIS IS PURE BOVINE
BYPRODUCTS!!!!!!!!!!!

Sounds like something dreamed up by some propellerhead whizbang, raised on a diet of germanium and silicon (especially when made into computers)....

There is NO danger of jeopardizing a cap by using it
at less than rated working voltage.

On the other hand, if one subjects some capacitors,
especially electrolytics, to ABOVE rated voltage, the
effect can and often does resemble Mount St. Helens. 
I once saw a can-type filter cap in a tube-type mobile
radio explode, and throw its guts 10 feet straight up
to stick on the ceiling of the shop (it was in an old
garage service bay).  It was LOUD, too.  

And that is the absolute truth.

73

Mike
WA4DLF

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