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

[wb3fau55 at neo.rr.com]

this  is very  true Todd.  But  not  a problem with those sealed transformers.  Other  problems  with
these.  The insulation still goes bad.  Russ.
---- "Todd wrote: 
> 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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