Don,
Here is the section in my article from ER
Magazine on rebuilding an RCA BTA-1R1 on the
homemade over I used with great sucess. all you
need is a thermostatically controlled hotplate a thermometer and a hood.
from my RCA BTA-1R! article in ER
A check of all the iron with a 1000V 1000 megohm
ohmmeter showed excessive leakage (less than 1000
megs) in the modulation reactor, the driver plate
transformer, and the control transformer. The
control transformer makes 110VAC for relays and
lamps from the 240V input. The smaller
transformers were baked in the kitchen oven at
140 degrees F for 5 hours. For the very heavy 50
henry modulation reactor, I fashioned a homemade
oven using a thermostatically controlled single
burner hotplate and a hood made from an old water
heater jacket (Figure 1). This allowed me to
cook the transformer out in the garage near the
rig. An oven thermometer allowed me to set the
oven temperature to 140 degrees F and after 25
hours of baking, the leakage was cured. All of
these transformers and chokes were then dipped in
transformer varnish to re-seal the winding from new moisture incursion.
Regards,
Larry W3LW
At 12:51 AM 9/18/2005, you wrote:
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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