|[AMRadio] Drying iron|
James M. Walker
chejmw at acsu.buffalo.edu
Sun Sep 18 23:47:41 EDT 2005
Yes it was covered before, and at that time I thought I would come up
with a viable way to dry out transformers, without going to extremes.
My solution was, an old Chemistry dept drying oven for glassware. They
are large and usually have steel racks in them, and a hole in the top
for a rubber stopper with a thermometer that monitors the inside temp.
I spotted one, grabbed it and only had to replace the temperature
device. Since I acquired it, I have used it to "cook" several
from Hallicrafters and RCA equipment. Some might say it takes up a lot
of space, I say yes they do but they also come in handy for drying
out. The Idea crossed my mind when we used to do thermal testing of
military radios also, that facility was lovingly called the shake and
bake device, as it also included a shaker table.
John Lyles wrote:
> You could put a short on the secondary terminals, and run up the primary voltage with a variac, to where you get the full current flowing in the short. Voltage will be, of course, low, and this will heat the transformer up without overloading it. Be sure to not exceed the rated DC current, and maybe to be safe, run it only 50-75% of that. Other than this, you could put a plywood or polyethylene sheet tent around it, and heat it with a radiant heater of any type. All you need is 120 deg F or so for so many days.
> > Hi all,
> > Ok, I know this has been covered here before, but is there a
> > consensus on how to get the moisture out of HV plate transformers and
> > chokes, so they won't arc on me. And before everyone jumps in with the
> > quick
> > "just put it in an oven on xxx degrees for yy hours", I am working with
> > the
> > iron from a Broadcast transmitter, specifically, the Gates BC-1G so
> > these
> > things are 100, 150 lbs each, and my XYL would REALLY not like it if I
> > tried
> > to put them in her fancy oven. They have been sitting in an
> > un-conditioned
> > but dry hanger/garage for several years, so I am certain they have
> > soaked up
> > a good deal of moisture over that time.
> > Thanks for any suggestions,
> > Don - W8HRQ
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