Re: The 1500t secondary myth

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Sparktron01@xxxxxxxxxxx 

Terry, Dr. R.

I've built a very high inductance for size coil using MULTIPLE layers
of AWG 28 (3) for a VTTC about 6-7 years ago.  Idea originated from
Gary Weaver.  The Q was so high, I could not measure accurately with a Signal
Generator (with fine tune DC input VCO), bandpass was extremely
narrow.  3 layers of close wound # 28 would approximately equivalent to
an AWG 22 wound coil, but with inductance of #28.

Regards
Dave Sharpe, TCBOR/HEAS
Chesterfield, VA. USA


> Original poster: Terry Fritz <teslalist@xxxxxxxxxxxxxxxxxxxxxxx>
>
> Interesting!!!  If you wind too many turns the secondary coil's
> "resistance" can start to be a real killer...
>
> The LTR coils tend to like a bit smaller secondary inductance, but the
> newer DRSSTCs don't care much...
>
> I note that DRSSTCs might like the lower peak current primary caps (full
> metal film, cheaper...) too!!!  Dr. Resonance has 150nF 2kV full metal film
> (not the higher current foil) caps in stock too...  DRSSTCs may not reach
> as high peak voltages either, so not as many are needed....  A DRSSTC cap
> maybe much cheaper still than their equally performing LTR conventional
> coil caps!!  Like 30nF at 10kV for just $10 ;-)))  that would make the
> primary cap almost a "trivially easy" part...
>
> Cheers,
>
>          Terry
>
>
>
> At 06:44 PM 12/15/2004, you wrote:
>
> >I also built a 3,000 turn coil last year.  I saw no performance gains
> >(actually a bit less) that our normal 1,400 turn coil.  Both coils were
> >operated with the same cap size (same energy input) and same size topload,
> >with a non-sync rotary gap for comparison.  The 3,000 turn coil performed a
> >bit less than the 1,400 turn coil.  I think the resistive losses began to
> >get too high.
> >
> >Power was provided by the same 14.4 kV PT set for 250 mA output.  We
> >monitored input current to set output with an adjustable power reactor.
> >
> >My conclusion was the 1400-1600 turns range provides the best coil
> >performance.  Beyond this nothing is gained.
> >
> >I wish to note our experiments were conducted with classic design TCs and
> >not a magnifier type design.
> >
> >Dr. Resonance
> .....
>
>