RE: [Fwd: Spark gap not firing]

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "John H. Couture by way of Terry Fritz <twftesla-at-uswest-dot-net>" <couturejh-at-worldnet.att-dot-net>


Ralph -

I have built and tested several TC's with the capacitor across the NST and
never lost a NST. I always used a protective spark gap across the NST output
as I show in my books. These protective gaps would operate once in awhile
during tests so a high voltage was never across the NST output. I do not
believe Terry's NST tests prove that the cap across the NST is more of a
risk than the gap across the NST.

Terry's test setup does show current spikes in the test circuit but high
voltage is what damages the windings and the curves  show only normal
voltages across the NST output. According to the List there have been many
NSTs destroyed that had the operating gap across the output. The TC primary
regardless of where the gap is located can have destructive voltages created
during operation and a protective gap across the output will keep these
voltages from shorting the windings.

John Couture

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-----Original Message-----
From: Tesla list [mailto:tesla-at-pupman-dot-com]
Sent: Thursday, February 08, 2001 5:13 PM
To: tesla-at-pupman-dot-com
Subject: Re: [Fwd: Spark gap not firing]


Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>"
<Parpp807-at-aol-dot-com>

Hi Bart,
Every text and pamphlet in my Tesla collection, including Circular 74, shows
the TC schematic with the capacitor connected in parallel with the NST. Now,
it suddenly
registers that these older schematics do not pertain to an NST. Until now, I
was unaware of Terry's paper on the subject. Thanks for calling this to my
flickering attention span.
There is learning taking place but it is very sloooow.

Cheers,
Ralph Zekelman