Re: Freau's efficiency theory=Success!

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

Original poster: "Barton B. Anderson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net>

Hi Jon,

Congratulations on your 61" success at 1080 watts! I think your actually
out-performing John's NST
formula by 4 inches. Typically, we are under it a few inches. Your coil
must be running well. I
truely like that cap size and high inductanc of both Lp and Ls. I think you
have further backed up
John Freau's efficiency thoery's with your coil and measurements.

Great job! Another set of specs with excellent results to log down. Thanks
for sharing. BTW,
typically there are little tid bits during your initial firing up of this
coil and what it took to
get to your latest achievement. I'm sure some of the members would like to
hear about anything
which stuck out to you during your tuning, building, or whatever.

Take care,
Bart Anderson

Tesla list wrote:

> Original poster: "Jon Rosenstiel by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <jonr-at-pacbell-dot-net>
>
> Hi all,
>
> Over the past few months I have built a medium sized Tesla coil
> based mainly on  John Freau's efficiency theories.
> http://hometown.aol-dot-com/futuret/page3.html
>  (Very good info John)!
>
> I feel this coil is a  good performer and I wanted to share it's
> specs with everyone. (Shameless coil gloat)!
>
> Secondary:
> Material= Home Depot HDPE drain pipe. (White on the outside,
> black on the inside).
> Diameter=4.2"
> Form length=26"
> Winding length=24.5"
> Total # turns=1830, (approx).
> Wire size=28
> Inductance=56mH, (measured).
> Fres, (bare)=219.3kHz, (calculated, my Navy surplus audio signal
> generator only goes to 200kHz)!
> Fres, (loaded)=104.4kHz, (measured).
> Toroid minor dia=5"
> Toroid major dia=27", (tube center to tube center)
> Toroid capacitance=32.24pF
> I also use a 1 7/8" x 6" control toroid that just fits over the
> secondary.  The lower surface of the control toroid is even with
> the top turn of the secondary.
>
> Primary:
> 21 turns of 3/16" copper tubing spaced 1/4". Tap point is 19.25
> turns, (measured 145.9uH).
> Measured Fres at this tap position is 94.7kHz, about 10kHz lower
> than the secondary Fres. (Coil tuned for maximum spark length)
> Tank cap=0.0187uF MMC, (Terry's Panasonic caps, 15 caps in each
> string, 5 parallel strings).
> Coupling, (K)=0.106
>
> Gap:
> 120bps SRSG.
>
> Power transformer:
> Unmodified 12kV 60mA Magnetek/Jefferson NST, (max input 140Vac).
> VA input=3220, 23A at 140Vac. (No PFC caps).
> Actual power input=1080Watts (Measured with Wattmeter)
> Maximum spark=61"
>
> Any comments or questions welcomed.
>
> Jon