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Re:Re: Unpotting and such

I unpotted my two 60ma. 15kv Allansons just as they stood.  I just
removed all the steel covers and screws and rivets and I had a block of
tar in front of me.  Be very careful around the hi-volt output terminals
when cutting away the steel case, the porcelains are very fragile.  Then
I went at the tar block with a 1" wood chisel and a hammer.  The tar just
chipped away in large chunks.  I had also in the past tried the heating
method by setting the tranny case on a electric heating element but the
tar got really stinky and it was a dangerous hot bubbling mess!  But it
did unpot well if you can get past the smell!  I think I will stick with
chipping at room temperature in the future, it has worked well for me. 

On Sat, 02 Sep 2000 19:20:06 -0600 "Tesla list" <tesla-at-pupman-dot-com>
> Original poster: "Sam Beck" <Sam-at-peterbeck-dot-com> 
> 	Hey All,
> 	I've got a 15/30 franceformer that I want to unpot.  I've 
> heard
> that the freeze method is bad.  I'd do solvents, but I don't want to 
> spend
> the $$$ to buy them(not yet, anyway).  So can anybody give me tips 
> on
> melting the stuff off?
> 	Also...I'm thinking of keeping the origional case.  Can you 
> use the
> case and fill it with high-voltage oil?  I'd put a liner of bonded 
> acrylic
> in, or maybe just some sort of pre-made container that fit(I've got 
> holes
> already drilled in the base for the Xfmr).
> 	Sam Beck