Re: [TCML] Coil Volume and Others

[Joe Mastroianni <joe@xxxxxxxxxxxxxx>]

Hi John,
Yes, that seems to be the case. 
On my original setup with 18nf and 15/30 I needed somewhere between 16 and 17 turns.   Then I changed my NST and increased to ~25nF the JavaTC calculations put me around 12 turns.  Now - if I can believe what JavaTC told me this AM - I may have been entering my data wrong - but it's telling me only 1.5 Turns!  I gotta recheck this.
In any case, there are a lot of unused turns.

Of course, I am loathe to remove the "unused" turns as I spent days threading the tubing through those polycarbonate holes...;-)  Probably time for a new primary.

Cheers,
Joe



On Jul 30, 2010, at 6:59 AM, futuret@xxxxxxx wrote:

> Joe
> 
> Do you have a lot of unused turns in the primary?  For example do you have 16 turns
> but are tapped at turn # 5?   If there are many unused turns, the primary will often
> arc at the outer turns because of the extra voltage build up there.  This is especially
> true at high powers.
> 
> John
> 
> 
> 
> 
> 
> 
> 
> primary from arcing, except by keeping the variac at 1/2 or below.  I've tried 
> 
> raising the secondary, to reduce coupling, just to see what would happen and  
> 
> had minimal effect.  I'm wondering if 1/4" tubing spaced 1/4" in an archimedes 
> 
> spiral is just not enough width to stop the arcing at this current.
> 
> 
> 
> 
> 
> 
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