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Re: [TCML] First light new secondary
Well that was easy to find. I had one dead NST, both sides. It was the odd one
in the bunch being a Eurocom and the rest are Transco. Think it was a poor NST
to begin with, or maybe I did something to destroy it?
Everything went well last night, though I did make a couple of changes. I
noticed my RQSG electrodes were not aligned properly anymore, and I'm guessing
that they moved due to heat and vibration. Was that the possible cause of the
one NST's demise? Anyway, I changed the RQSG out with my new SuckerSG, and that
worked very well. I kept the gap at about .2".
I found my tap point for tuning to be exactly where I experimented in JavaTC, 7
turns. A whole turn different either direction really made a significant
difference in output arc. However, a quarter turn either side of 7 turns was
almost unnoticeable in output performance.
So I do have a couple of questions. I roughly measure 30” arcs with a breakout
point using the 12000/90mA setup with 30nF of tank capacitance and a .2” SSG.
The Terry Filter never fired once (unlike the night before when it did fire
What are my options to increase performance? Can the gap be widened without
much risk if the Terry Filter is properly adjusted? JavaTC calculates my top
load to be 19.796 pF, which seems right to me based on the input power. Will
more capacitance produce longer but fewer arcs? Am I down to the point of
adding more current to the primary circuit as being the only option?
I’m not looking for the longest arc but I am looking for better overall
Thanks to all of you who have helped me along to this point.
From: Bert Hickman <bert.hickman@xxxxxxxxxx>
To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
Sent: Thu, October 21, 2010 11:10:46 AM
Subject: Re: [TCML] First light new secondary
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:
>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?
>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
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