Re: [TCML] Subject: Overheated Secondary

[mark olson <kc5gym@xxxxxxx>]

At 05:57 PM 1/3/08 -0800, you wrote:
> Hi Marko,
>
> I suspect a secondary short (and then the overheating occurred). This 
> would be the norm.
>
> Just unwind a few layers (about 100V loss per layer I expect). Also, don't 
> pot until you measure output. The windings have to be put on in the 
> correct winding polarity (which if you didn't mark their direction before 
> you took it apart you may have to do a quick trial and error test to get 
> it right).
>
> Take care,
> Bart
> > I depotted my transformer and began cleaning it up.  It does not look 
> > like the one Bart photographed.  My
> > transformer has two primary coils in parallel and two secondaries in 
> > series.  One secondary overheated.
> > It never went open (until I worked on it) .  The insulation is gone from 
> > the outer layers of the winding.
> > Not sure how deep the damage goes, it is too cold to work on it lately.
> >
> > Thanks,
> > Marko
Thanks Bart,

My photos are here:  http://members.cox.net/kc5gym/

I have a question or two, maybe a million.
There is a picture of the shunt in my hand. I should remove 1/2 of these?

I was not able to preserve the original "angel hair" wire terminations on 
the secondaries.  Are the inner windings
connected to center tap or are they the hv ends?  I suspect the outer ends 
are the outputs.

Thanks
Marko 

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