Re: [TCML] Still stuck at 36"

[bartb <bartb@xxxxxxxxxxxxxxxx>]

Did you try all 6 strings in parallel and then retune down to about 7 
turns? Thinking of course of the original 5.25" coil with only the 4.5 x 
18 toroid. This would actually be the normal LTR value for the stack of 
NSTs at 7.5kV 180mA (.09uF). You could also try .075uF using 5 strings. 
This would have tuned in at 8 turns on the same coil.

Reason I ask is that the gap (given it's low gap spacing), the 0.045uF 
should be running 300 bps. The gap itself may not be doing well at this 
range. Taking the cap over the resonant hump to LTR would lower bps to 
about 100 (.09uF) or 130 (.075uF), increasing overall bang energy and 
maybe do better with the gap used. Lot's of air is needed blowing threw 
the pipes (not across them).

Bart

Bill Bohn wrote:
> This still will not do more than 36-40". I have put together a mmc cap bank.
> The caps are cornell  dubilier  942c20p15k 2000vdc .15mfd
>
> I assembled them 10 series -6 parallel.I have 6 rows. I can adjust  for 1
> string,up to all 6.Still 7500v@xxxxxxxx seems best with 3 strings
>
> I have spun another secondary coil that's 6.625 sch 40 pvc wound 1060
> turnes.The spark output is about the same as my 5.25 coil with 1607 turnes
>
> I have used various top loads.The 6.625 coil seems best with a 4.5x18 toroid
> with a 7" sphere on top
>
> Am I under powered to drive a coil at 6.625?
>
> I have the same spark gap described in( stuck at 36)
>
> Thanks much from the frustrated.
>
>  
>
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