Re: [TCML] Nearly First Firing

[bartb <bartb@xxxxxxxxxxxxxxxx>]

Hi Simon,

An ascii diagram of the circuit might be helpful.

Because the gap fires without the cap yet doesn't with the cap may 
indicate a connection issue or possibly a very low current NST. But, you 
say from deepfriedneon calc's, so .016uF, I assume the NST was suppose 
to be 40mA short circuit current rating (400VA NST)? If true, then maybe 
there is a connection issue. Is the gap across the NST before the cap or 
after? Should be before the cap.

Here's a schematic of my 4.5" spark gap coil which may be useful to 
double check connections.
http://www.classictesla.com/photos/ba45/sch45.pdf

If your circuit appears ok to you, then it sounds like a current issue 
with the NST.

Take care,
Bart

Simon Dodd wrote:
> Hi Guys,
>
> I went for first light this evening!! Unfortunately there was nothing! 
> My spark gap fires when there is no capacitor bank in place but as 
> soon as I put my MMC into the circuit and connect the main parts of 
> the coil, the spark gap stops firing :-(  I am using a 10Kv NST with a 
> static spark gap and 16, 20Kv 1000pf capacitors in parallel. These are 
> from the calculations on deepfriedneon.  The spark gap will fire if 
> the lead to the outer ring of the primary is left unconnected.
>
> Im sorry its not too clear, I can do a quick diagram if you want more 
> info.
>
> Thanks for your help again
>
> Simon
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