Steve
easy to fix! take it apart,,, maybe take some pictures first, remove 1
full winding,where it has burnt, and resolder. I used silver. regular solder
will work. But every time that i have "smoke" from a variac it was due to a
very large overload for a long time.
so yes take it apart clean scrap the wire ends, try not then to turn all
the way to the repaired end.
73
wayne k8lee
In a message dated 12/26/2009 4:38:22 P.M. Eastern Standard Time,
K1SG@aol.com writes:
In pre-testing a junkbox Variac before using it for filament control, I
watched it arc and spark and burn out the winding near the high voltage
end.
Does anyone do Variac repair and rewinding? Or is that another "lost art?"
As a side question, I was running the variac into a step-up transformer,
which was unloaded. Does the primary of an unloaded transformer present a
significant load? Some Specifics: 5A Variac driving a 120:240VAC
transformer
of unknown power capability, weighing probably about 10 pounds. I know if
I
put a 2.5 A load on the 240V side, I'm drawing 5A through the primary, so
I'm staying well below that level. The question is, do winding
resistance,
core losses, etc, add a large enough load to fry the Variac in front of
the
transformer?
Thanks,
Steve
Steve Gilbert
K1SG
K1SG@AOL.com
508-435-9133
FN42fe
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