[Milsurplus] [ARC5] Old Dynamotors- Don't be a DooFuss Like Me....

[Thekan, Paul]

I have a vacuum chamber oven I saved from the dumpster here at work. I thought I could use it to dry out xfmrs under a partial vacuum. Just need to find an old Welch vac pump now.

 Anybody see a problem with this...as long as I do not 'implode' anything.

Tnx
Paul
N6FEG

-----Original Message-----
From: milsurplus-bounces at mailman.qth.net [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of J. Forster
Sent: Monday, April 01, 2013 7:09 AM
To: Todd, KA1KAQ
Cc: Military Radio Collectors Association; milsurplus; ARC-5 List
Subject: Re: [Milsurplus] [ARC5] Old Dynamotors- Don't be a DooFuss Like Me....

For years, I've always baked out stuff with non-hermetic magnetics.

I put the thing on a few bricks, put a couple of 100 Watt incandescent
lamps underneath it, and a big cardboard box with some holes in the top
over it, and let it sit for a week or more.

You want the thing to get up to about 130F for several days, at least.
Longer is better, IMO.

YMMV,

-John

==============


> On Mon, Apr 1, 2013 at 12:50 AM, David Stinson <arc5 at ix.netcom.com> wrote:
>
>>
>>
>> I thought about putting the whole thing sans end bells into a 200-degree
>> oven for a couple of  hours to dry it out
>>
>
> This is  a problem with big chunks of iron in old transmitters, too. Many
> do not realize how similar to a sponge the laminations and windings are.
> And old transformer left sitting in a damp cellar or storage shed is an
> accident waiting to happen if you just haul it out, hook it up, and apply
> voltage. Might happen in 5 seconds, 5 hours, or 5 days, 9.9999 times out
> of
> 10 it'll zorch.
>
> The oven works great as is provides a means of getting rid of the moisture
> without introducing more. On bigger pieces it can take a day or two, maybe
> more, to feel safe enough to put power to it. And there's never a
> guarantee, of course. But recovery rate is far, far better when dried out
> than when not. The trick is to heat it up long enough for the heat to
> reach
> the core and drive out the moisture. It's all about the mass. Smaller =
> faster; hours vs days.
>
>
> A good reminder as many of my dynamotors are out in the garage here in
> humid NC. Though lately humidity has been amazingly low.
>
> ~ Todd,  KA1KAQ/4
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