Re: [TCML] Coil Volume and Others

[Joe Mastroianni <joe@xxxxxxxxxxxxxx>]

Well, I tried 1.5 turns and that was a non-starter (literally).  
It's more like 9 turns of 1/4" refrigeration tubing, 1/4" apart,  to tune with 41nf, 22" of 26Ga wire on the secondary, etc.  At least, that's my empirical result.  Lemme try doubling up on the toploads.  I've got another (smaller) toroid.  I will try stacking.

But I'm finding out  a lot of interesting stuff.  Like:  

 - My Terry Filter safety gaps fire when I have the SRSG set at 120bps and it's out of tune.    It does not fire when I have the SRSG set to 240bps and it's out of tune.
 - I get arcing on the primary when I run at 240bps and the primary is in tune, but the SRSG is off TDC
 - I do not get arcing on the primary when I run at 120bps and the primary is in tune but the SRSG is off TDC (maybe this is because the terry filter gap is firing)
 

Because I have a persistent and driving need to construct things, I'm turning my propeller gap into an ARSG as I write this....  I suppose if I blow up my NSTs I'll just go build a DRSSTC.  I have one of Dan's kits sitting in the box in the corner, calling my name.


On Jul 30, 2010, at 1:40 PM, Yurtle Turtle wrote:

> Or a bigger topload.
> 
> 
> 
> ----- Original Message ----
> From: Joe Mastroianni <joe@xxxxxxxxxxxxxx>
> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
> Sent: Fri, July 30, 2010 10:53:17 AM
> Subject: Re: [TCML] Coil Volume and Others
> 
> 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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