I would build a wood bracket to hold the transformer upside down suspended
over a disposable large aluminum roasting pan.
Set it in the oven and gradually up the temperature until the tar starts
dripping out. Keep it there for a couple hours.
I would pot it in mineral oil. You can get this cheap from any "country"
store that sells horse and other critter stuff.
Vaseline can leave pockets of air.
Dave
> -----Original Message-----
> From: tesla-bounces@xxxxxxxxxx
> [mailto:tesla-bounces@xxxxxxxxxx] On Behalf Of Tim Flood
> Sent: Tuesday, November 05, 2013 06:25
> To: tesla@xxxxxxxxxx
> Subject: [TCML] NST Repair
>
> I heated the two 9/60 NST's in an oven hoping to repair any possible
> internal shorts. Luckily, this was done at an oven here at
> work. About one
> third of the tar boiled out exposing the upper portion of the
> windings,
> etc., and leaving slumped areas with porosity holes.
>
> The questions are should I reheat the transformers at a lower temp. to
> close up the holes then replace the lost tar with vaseline?
> Melt out all
> tar and refill completely with vaseline? Replace the
> transformers and not
> go through the above.
>
> In the meantime I'm starting on a completely new one.
>
> Thanks in advance for any advice, and yes I probably did
> something wrong
> when heating the transformers.
>
> Tim Flood
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