[R-390] Question about VARIAC

[rbethman]

Chris,

DON'T take it off-list!  Please!

Others want to know.  I've got one or two with a broken winding too.

Would LOVE to have insight as to how to go about this!!!

Bob - N0DGN

Chris Kepus wrote:
> Oops...sorry for extending this thread further away from its starting point.
> It's been of great interest to me but I meant to reply to Don directly and
> not take list bandwidth for this particular question.  Please excuse the
> bandwidth.
>
> 73,
> Chris
> W7JPG
>
> -----Original Message-----
> From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net]
> On Behalf Of Chris Kepus
> Sent: Sunday, April 19, 2009 10:21 PM
> To: '2002tii'; r-390 at mailman.qth.net
> Subject: Re: [R-390] Question about VARIAC
>
> 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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-- 
Bob - NØDGN