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Re: GNATS meeting, and harmony/synergy

Subject: 
            Re: GNATS meeting, and harmony/synergy
       Date: 
            Tue, 25 Mar 1997 22:59:31 -0800
       From: 
            Open Minded <"unknown-at-apc-dot-net (No spamming! Try
\"70314.1744"-at-compuserve-dot-com~but_remove_this_part!~.pupman-dot-com>
Organization: 
            I'm NOT organized!
         To: 
            Tesla List <tesla-at-pupman-dot-com>
 References: 
            1


Tesla List wrote:
> 
> Subject:
>         Re: GNATS meeting, and harmony/synergy
>   Date:
>         Sat, 22 Mar 1997 18:19:14 -0500
>   From:
>         "Robert W. Stephens" <rwstephens-at-headwaters-dot-com>
>     To:
>         Tesla List <tesla-at-pupman-dot-com>
> 

((SNIP))


> >
> >
> > Richard -
> >
> >   What about a rotary? I've got 0.06uF worth of primary C, and am
> > running about 3-3/4 turns on my primary. No flames, but wicked
> > 6' sparks out of the coil...I guess I did something right.
> >
> > - Brent
> 
> Brent,
> 
> Of course, nobody should try to argue with success, but like one of
> your teachers, Bill Wysock, you have become a capacitor beater!(IMO).
> I'm about halfway between your extreme of very low primary inductance,
> and
> the rest of the cool cats on this list.  I have very successful coils
> that operate with flat spirals in the 5-6 turn range.  That
> represents however somewhat more than twice the primary L that you
> are using.  With very low primary L , the primary circuit
> intreconnection leadlength takes on a more significant role in
> absorbing generated RF power through inherent off-axis inductance.
> 
> You are clearly routing your wiring in a good, low loss mode to get
> such good performance out of a 3+ turn primary.
> 
> I recommend that you investigate employing an increased primary L.
> The resultant reduced surge current will reduce power lost in the
> gap, and will make your capacitors live longer.
> 
> rwstephens


Got it...

When I run this baby with the insulated table for the 'lightning off
the fingers' bit, the primary tap gets moved to 5-3/4 turns. Really
haven't noticed any change in gap quenching, tone or anything else.
I *would* like to try making a second secondary coil with higher
inductance so that the primary tap stays at the higher number of
turns, though the idea of having to stuff yet another TC part into
the back of the truck for shows gets old...!!!! :-)

Another thing to try is machining holders for a slanted primary
that fit into the existing holes for the flat spiral holders. I can
probably get 8 - 10 turns without the primary extending out too
far past the base. Hmmmmm. Yet another thing to tinker with.

Meanwhile, it works, the audience goes oohhhhh, and the caps
haven't gone uggghhh yet. (short, infrequent run times)

- Brent

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