Re: The 1500t secondary myth

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Malcolm Watts" <m.j.watts@xxxxxxxxxxxx>

Hi Terry,

On 15 Dec 2004, at 19:18, Tesla list wrote:

> 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...

There is no doubt about that in my experience. I explored such
extremes in my earlier experimental days to put theory about
proximity effect etc. to the test and found that performance in spark
gap coils suffered noticeably. Such losses are a real loser in CW
coils where voltage gain is Q related.

Malcolm

> 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
> .....
>
>
>