>>Crazy dual layer primary with a crazy amount of turns
While the prevailing List wisdom suggests that such high aspect ratio
secondaries are less than optimal, I'm not sure there is a comparable norm
for primaries. I think that as long as coupling is appropriate, I've never
seen a suggestion that there may be a too-large primary configuration. If
the primary inductance is too small, the primary impedance is low and this
causes spark gap losses to be higher. Everything else being equal, lower
frequencies result in lower wiring resistance losses, and lower frequencies
suggest larger toploads which improve performance by having a larger charge
reservoir. Everything I've done suggests that Bigger is Better. As a
means to achieve these goals without building a primary that wouldn't fit
through a door I built my primary as a two-layer job with a layer of lexan
between for insulation. See http://www.laushaus.com/tesla/primary.htm
Regards, Gary Lau
MA, USA
On Wed, Jan 30, 2019 at 5:14 PM Chris Reeland <chrisreeland@xxxxxxxxx>
wrote:
> Hi Steve,
>
> Keeping warm today?
>
> Wow...definitely more than a "candle stick" type.
>
> Looks like it was built on a Tektronix oscilloscope cart. Also looks like a
> lot of wire was pulled off the top end at one point in trying to tune.
> Crazy dual later primary with a crazy amount of turns also. Looks to be a
> fairly nice old cap though...but probably has PCB's.
>
> I thought a fairly recent tube coil on eBay was a big candle stick, but
> this one definitely beats it.
>
> Still kind of interesting what was tried in the past...fun to look at and
> analyze some now...
>
> Chris Reeland
> Ladd Illinois USA
>
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