On Tue, 17 May 2005 23:30:49 -0700 "Watson A.Name - \"Watt Sun, the
Dark Remover\"" <NOSPAM@dslextreme.com> wrote:
Quote:
Well, thanks for the info. It seems that the resistors were made for
tube equipment. The insides of a toob chassis get nice and warm, and
would cook the moisture out of the resistors. Except almost all of the
equipment nowadays is not toob and doesn't get that hot inside.
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The tube connection is a very good point. I often think about letting
my old tube gear just warm up occasionally to drive off the
accumulated moisture, but I'm still not likely to leave any of them on
for a week. Of course if I used that gear every day everything would
probably be fine.
Quote:
I found a bag of at least a hundred 56k, 1/2W resistors that are the
same way. I think I'll put the whole bunch into a 'hot box'.
It puzzles me why it should take so long. Maybe the resistors are
coated with something to make them moistureproof, and it's just not
perfect, and lets in the moisture over the years. But when I think
about it, having it take years to get that way, it's really not that bad
having to wait only a week to fix it.
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It can be surprising how long it can take to drive off moisture. In
vacuum systems, we will sometimes bake a stainless steel tube to 200C
for several hours in order to produce the best possible vacuum.
Moisture is not the only thing that's being driven off, but it's the
main one, and that's just from a "clean" metal surface.
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Jim Adney
jadney@vwtype3.org
Madison, WI 53711 USA
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