Re: Unpotted NST

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: gary350@xxxxxxxxxxxxx 


I unpot my neons to remove shouts.  I have changed all of my 15K30ma 
neons to 15K60ma neons.  The high voltage oil provides a liquid 
cooling system for the coil and wire as well as preventing arcs and 
sparks therefor the transformer is almost bullet proof.  I have 
unpotted several neons and all have just enough shunts removed to 
double the power of the transformer.   I have a 4" TC with 1 unpotted 
neon, a 6" TC with 2 unpotted neons in parallel, a 8" TC with 3 
unpotted neons in parallel.  This is the time of the year I like to 
unpot neons.  I set them on the wood stove in the work shop.   After 
about 30 minutes the heat from the stove melts the tar and I pour the 
tar off into a pan.   Then I wash the neon in fuel oil.  Rince with a 
solvent that evaporates like gasoline.   Remove a few shunts then put 
the neon in a plexaglass box full of HV oil.   The kitchen oven works 
the best for unpotting neons there is no smoke at all just place the 
neon in the oven at about 200 degrees for 1 hour if the tar is not 
melted turn the heat up 25 degrees every 30 minutes until the tar melts.

Gary Weaver


>
>Original poster: Mike <megavolts61@xxxxxxxxx>
>
>Thanks Mike for the reply.  What is the reason they pot them in the
>first place?  Dennis
>
>Hi Dennis,
>    They pot them for one main reason....to make them weather
>proof.   The secondary benefit is that no corona will be developed in
>the tar, which might lead to early failure of the transformer.  When
>we play with them,  we tend to exceed their design limitations, so
>sometimes a carbon track will form and essentiall short out one side
>of the transformer..