[TCML] Terry filter alternative

[resonance@xxxxxxxxxxxx]

With pole and PT xmfrs you may consider just using a 4" dia x 18 long PVC
tube wound with #26 AWG PVC covered wire.  This clips all the really VHF
and other nasty transients and keep most of the most dangerous transients
out of the PT or PPs sec coil.

I use this on all of our PT and PP powered systems.  Sometimes we throw in
a resistive network as well, usually approx 12 --- 200 watt, 500 Ohm
resistors connected in parallel between the input RF choke and the HV xmfr
bushing.

Dr. Resonance


> Hi Ed, all,
>
> That is a good question and I think it may be just a matter
> of a "too much protection is better than not enough" men-
> tality. I know from personal experience in the past that I
> have let the smoke out of numerous NSTs. Of course I
> was indeed guilty of opening up the main gap to get ever
> longer sparks and usually did not even have a safety gap
> in my design. In the beginning I just didn't know any bet-
> ter and the only "protection" that I would have at all was
> the proverbial RF choke coil. Now we know that an RF
> choke coil may even worsen the kickback situation. How-
> ever, it seems from personal experience that even as I did
> begin to employ more of the currently accepted means of
> protection, that I would still sometimes fry one here and
> there. Now I cannot give any personal review on the Ter-
> ry filter as I never did get a chance to employ one of these
> into any of my coils.

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