[R-390] Question about VARIAC

[Chris Kepus]

Don wrote: " It is not hard at all to rewind variacs --"

Don, 
Would you please be so kind as to elaborate on your repair and rewind
process?  I have two Variacs in need of rewinding.  One that has windings
fried as you described and another that has the problem at the other end of
the winding (just occurred to me that someone probably wired it
"backwards").  Do you have pictures of your efforts or a write up that you
could share?  There are a *lot* of windings so I am interested in the whole
story as well as the materials, how and where you spliced the new wire in
(e.g., the inside of the core), the wire you used (mine look like they are
wound with enameled wire and, of course, the enamel is removed from the
portion contacted by the wiper.  
Thanks for anything you might like to pass along.
73,
Chris
W7JPG

-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net]
On Behalf Of 2002tii
Sent: Sunday, April 19, 2009 10:03 PM
To: r-390 at mailman.qth.net
Subject: Re: [R-390] Question about VARIAC

Roy wrote:

>For years I had a little bud box with a on amp variac, low
>voltage transformer and a rectifier/filter.  Made a fine variable DC
>supply.  Unfortunately, the caps or the diodes shorted and burned the
>variac's first 5 or 10 turns.  Sigh.

It is not hard at all to rewind variacs -- I have several here I 
acquired free and rewound the burnt parts (in these units, the turns 
between the input tap and where the wiper was when the load failed, 
which is what usually fries).

Best regards,

Don


































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