RE: France unpotting progress. 12 and 15 60s

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Jim Mora" <jmora@xxxxxxxxxxx>

Hi Jack,

I could make use of the 12 or 15/60. The broken horns are irrelevant as I
found repotting in the original tank simply too messy of a clean up job. One
of these with my full wave quadrupler should charge the big discharge caps
(4.1uf, 50KV)x 2 in parallel (they won't ever see more than 30-40kv)for a
wire exploding demo.

I have been charge testing with a 1uf, 30KV Maxwell. The discharge
electrodes are to be 2" solid brass dowels, pneumatically driven.

Regards,
Jim Mora

-----Original Message-----
From: Tesla list [mailto:tesla@xxxxxxxxxx]
Sent: Sunday, March 04, 2007 2:34 PM
To: tesla@xxxxxxxxxx
Subject: RE: France unpotting progress. 12 and 15 60s

Original poster: "Jack King" <ekklekktikk@xxxxxxxxxxx>


Hey Jim

If your in a tar dissolving frenzy, I have a number of FRANCEFORMER
12 and 15 kv @ 60 ma units that could have similar surgery performed.
These are good cores, but with one or more damaged HV bushings....

If anyone is interested, I wouldnt mind sending the 6 or so I have to
one or two locations...

Ill be real resonable too :^)

Cheers

Jack King



>From: "Tesla list" <tesla@xxxxxxxxxx>
>To: tesla@xxxxxxxxxx
>Subject: France unpotting progress. Proof positive aging Frances/tar
>potted trans carbon track.
>Date: Sat, 03 Mar 2007 22:23:24 -0700
>
>Original poster: "Jim Mora" <jmora@xxxxxxxxxxx>
>
>Hi,
>
>I pulled my 12/30 out of it's marinade of gas and diesel fuel and bushed
>away to the shunts nice and clean - quite a few. I'm going to give it
>another day or two, brush it again at the tops of the HV coils and submerge
>it in a cleaner solution. Geez, these are nice without the bulk! The next
>phase may be to start submerging it in mineral oil to mix with the solvents
>and displace them. I have a vacuum pump if I can find a suitable evacuation
>chamber. First to knock out some shunts!
>
>The spark of this transformer was a weak purple. There were visible cracks
>in the tar. The windings measured at least 1K ohm difference to ground. Now
>the resistance is equal and substantially higher. This is a circa mid 90's
>France transformer... so beware:-^)
>
>I'll snap a couple of pictures before I button it up and put em up on my
>Google blog. Internally, it is very straight forward.
>
>I'll take out half the shunts as advised and mind the short circuit current
>which will be high with the giant caps I'm trying to charge. The voltage
>full wave Cockcroft/Walton quadrupler is awaiting the France. As mentioned
>it works great with a healthy, newish transformer.
>
>Jim Mora
>
>I have a ferro - resonant dual C core almost this size for a 100Khz charger
>project as well; but, I'm still "stuck in the sixties". And most of us like
>taking things apart and a long time ago playing in the mud!
>

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