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Re: FW: Unpotting a France 12/30
Original poster: Frank <fxrays@xxxxxxxxxx>
As a suggestion,
I would not use diesel to remove the final remnants of tar.
Diesel LOVES water and is also leaves an oily residue.
You could actually trap moisture back in the windings when you are done.
The best solvent to use is Kerosene. It will
evaporate and not leave a film, will not attract
water and is less viscous so it penetrates those small areas better.
Gasoline works well to but it is too dangerous and hard on the body!
At 11:36 PM 2/27/2007 -0700, you wrote:
Original poster: "Jim Mora" <jmora@xxxxxxxxxxx>
I searched the archives and read Richard Quick?s
methods. Generally he did not recommend trying
to unpot a neon in the case as the transformer
is not attached to it and the wires get broken.
Hmm, I easily chipped off the asphalt off the
top of the transformer. Then I took an 8? C
clamp and thread side up clamped the transformer
in place. This makes for a handy handle. I then
fired up the barbeque. I had to set it in the
lava stone to close the cover. In the time it
takes to slow cook a thick steak, I had all the
asphalt melted and drained out, no wires
disturbed. It is now marinating in Diesel fuel.
The trick will be to remove some shunts while in
the case, mayhap I will have to drill a couple
of holes through the side and then plug them???
From: Jim Mora [mailto:jmora@xxxxxxxxxxx]
Sent: Monday, February 26, 2007 6:43 PM
To: 'Tesla list'
Subject: Unpotting a France 12/30
I have a couple of France 12/30?s. I want to
un-pot one of them (some of the tar is cracked
and likely leaky) and remove a few shunts to
make a cap charger with a 5x multiplier. A newer
15/60 works just fine with some serious humming
fast and weighs three times the France! I am
wondering if I can keep the France in the
original tank and carefully heat it in a gas
powered BBQ. Ideally, I would like to pour
molten tar out and soak the tranny in diesel, or
gasoline to dissolve the rest. I guess I will
have to remove the core to knock out some shunts
and hopefully be able to reconnect the HV bushings.
If I can leave it in the original tank, I would
melt some paraffin and Vaseline together and
repot it in that. Hopefully I can squeeze 40 or
50 ma out of it and current limit the cap input
which would likely be just right. I know this is
a well covered thread; but, has anyone
successfully done this using a similar method? I
would be open to mineral oil which probably
sinks away the heat better, but the on time
should be no more than a couple minutes.