[TCML] First light new secondary
bert.hickman at aquila.net
Thu Oct 21 09:10:46 MDT 2010
Congratulations and condolences... :^)
Try disconnecting the Terry filter to see if you get any output from the
NST bank. If not, one of the NST's may have failed - this can draw
current from all the others, killing output for the entire bank. Your
strategy of testing each NST individually to locate the defective one(s)
will work. It is NOT likely that you killed all four, but it might be
possible that you killed different halves of two of the NST's.
Miles Mauldin wrote:
> Hi all,
> Great evening with my first coil in more than 30 years. If you recall
> I burned up my first secondary with a design flaw. I did good this
> time. No racing sparks, no strikes to the primary nor grounded strike
> rail. Looked great and obtained 3+ foot arcs in the air, not to a
> grounded point.
> This was with the tuning point from JavaTC. I thought I would play
> with the tuning to see if I could improve the output. During that
> testing effort, changing the primary tap point a half turn at a time,
> everything just stopped. Even with everything disconnected I can't
> draw an arc on the NSTs. I have 4 x 12/30 on parallel for a total of
> 12/120. Could I have really killed 4 NSTs?
> I have a Terry filter that I adjusted with just the NSTs connected an
> nothing else. Any clues?
> It's late tonight, but I plan on testing each NST to see if just one
> is shorted and grounding the rest. The safety gap fired a few times
> but not enough to cause concern IMHO.
> My setup is a 4.125" secondary with 25" of 23AWG for 975 turns. K of
> .125. 4 x 12/30mA for 120mA total. A blown RQSG with 30nF tank. Total
> gap is .21.
> Clues? Suggestions? Comments?
> Best Regards, Miles
> Sent from my iPhone _______________________________________________
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