I think that they are spares for an inguction furnace. Good for audio frequencies at high power but little else
On 9 November 2017 14:45:05 GMT+00:00, Steve White <steve.white1@xxxxxxxxx> wrote:
>They look like PFC capacitors to me. No good for TC use.
>
>----- Original Message -----
>From: "Rafal Pisula via Tesla" <tesla@xxxxxxxxxx>
>To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
>Sent: Thursday, November 9, 2017 3:47:28 AM
>Subject: Re: [TCML] First coil
>
>Hi folks,
>
>My first post - I just saw these caps listed on industrial auction site
>-
>not sure if of any use here, but just in case they are:
>
>http://www.go-dove.com/en/auction/view?id=12580057
>
>If anyone is interested, but is hesitant due to collection reasons etc
>-
>let me know, (PM me) as I can bid / collect on your behalf etc as I am
>interested in other items there, plus not too far for me
>
>Cheers
>
>Rafal
>
>
>On 30 October 2017 at 01:16, Terry Oxandale <toxandale@xxxxxxxxxxxxx>
>wrote:
>
>> Hi Gary,
>> I'm using a 6" x 30" secondary with an 8" x 34" toroid (plans are to
>use
>> this with a larger coil in the future, and these are very expensive
>so I
>> chose a single purchase of the larger between the two sizes
>considered).
>> 10Kva pig that is current and voltage adjustable, flat primary with
>.045uF
>> caps using an asynchronous rotary spark gap.
>> Per Bert's input (thanks Bert), tuning with the barb has been
>> accomplished, which brings me to a question about increasing bang
>size: Can
>> bang size also be increased by decreasing the rpms of the spark gap,
>by
>> allowing a larger charge to take place (using 8-point RSG on a
>variable DC
>> motor)? Interesting thought on the decreased barb length. The current
>one
>> is 1" long, I may go for 1/2" or perhaps 1/4" to see about increasing
>the
>> breakout voltage.
>> Anyway, I do have a smaller toroid I'll try (5" by 30" - a large
>> cast-aluminum corona ring with an aluminum plate welded in the
>middle, so
>> yes, it is odd, but it appeared to be effective) to get some
>perspective on
>> that.
>> Cheers,
>> Terry
>>
>> From: Gary Lau <glau1024@xxxxxxxxx>
>> To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
>> Sent: Sunday, October 29, 2017 1:52 PM
>> Subject: Re: [TCML] First coil
>>
>> Hi Terry,
>>
>> I'm thinking that if the toroid size is too big, it won't break out
>without
>> the barb. Perhaps a few more details of your coil will make for a
>clearer
>> picture. Power source, gap details, cap size, and most importantly,
>toroid
>> size? With toroids, bigger is usually better, at least as far as
>getting
>> the longest possible streamer from a breakout point, but if you're
>shooting
>> for sparks without a breakout point, a smaller toroid may be
>necessary.
>>
>> Regards, Gary Lau
>> MA, USA
>>
>> <http://www.avg.com/email-signature?utm_medium=email&;
>> utm_source=link&utm_campaign=sig-email&utm_content=webmail>
>> Virus-free.
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>> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
>>
>> On Sun, Oct 29, 2017 at 12:25 AM, Bert Hickman
><bert@xxxxxxxxxxxxxxxxxxxxx
>> >
>> wrote:
>>
>> > Hi Terry,
>> >
>> > Racing sparks typically occur when energy is being injected into
>the
>> > secondary too quickly. Although this is _usually_ caused by
>> > excessively-high coupling, it can also occur when the bang size is
>too
>> > large for the size of your secondary, or if your system is
>significantly
>> > out of tune. To solve the problem(s), you'll need to first insure
>that
>> your
>> > system is in tune, that P:S coupling is not excessive, and that
>your
>> toroid
>> > is appropriately sized for your system's peak output voltage.
>> >
>> > 1. Tuning:
>> > I'd suggest initially running the system with a breakout point (or
>barb)
>> > during this phase. Reduce the primary spark gap length to reduce
>maximum
>> > bang size. Experiment with primary tap point until you get the
>maximum
>> > secondary spark length at a given variac setting. The system should
>be
>> > smooth running with consistent spark length under continued
>operation.
>> >
>> > 2. Coupling:
>> > If you don't see any racing sparks, slowly increase the "bang size"
>by
>> > widening the main gap slightly. Don't increase gap length beyond
>the
>> point
>> > where the safety gaps begins firing or if you start to see racing
>sparks.
>> > If you see racing sparks, reduce coupling slightly and continue the
>> process
>> > of increasing the main gap length until you can run at full power
>with no
>> > evidence of racing sparks. You may need to retune the primary a bit
>by
>> > increasing primary inductance slightly (i.e., moving the primary
>tap
>> > outwards 1/8 - 1/4 turn) to compensate for capacitive loading of
>longer
>> > secondary streamers. Any signs of racing sparks mean that you need
>to
>> > further decrease coupling.
>> >
>> > 3. Final tweaking:
>> > Reduce the length of the breakout point/bump to see if the coil can
>> > self-break from the toroid as you approach full power without
>introducing
>> > any racing sparks. Further decrease coupling if you see any
>evidence of
>> > racing sparks. Ideally, an appropriately-sized toroid will
>self-breakout
>> > before you reach full power. Failure to self-breakout can occur if
>the
>> > minor toroid diameter is too large (requiring excessively-high
>breakout
>> > voltage) or if the major toroid diameter (and capacitance) is too
>large,
>> > which reduces maximum topload voltage below the point of
>self-breakout.
>> For
>> > this case you may need to operate your system with a breakout bump
>or
>> point
>> > to insure breakout. Even with an optimal setup, you may still need
>to
>> use a
>> > breakout point during humid weather when it's significantly more
>> difficult
>> > to initiate breakout.
>> >
>> > Good luck,
>> >
>> > Bert
>> > --
>> > Bert Hickman
>> > Stoneridge Engineering LLC
>> > http://www.capturedlightning.com
>> > +1 630-964-2699
>> >
>***********************************************************************
>> > World's source for "Captured Lightning" Lichtenberg Figure
>sculptures,
>> > magnetically "shrunken" coins, and scarce/out of print technical
>books
>> >
>***********************************************************************
>> >
>> >
>> > Terry Oxandale wrote:
>> >
>> >>
>> >> It's been a long time since I was more active on this list. I
>never was
>> a
>> >> "technical" enthusiast, so being I've had the coil in storage for
>> probably
>> >> 10 years, and have forgotten more than I remember about coiling.
>I'd
>> like
>> >> to
>> >> tap the group for some help or advice please.
>> >>
>> >> My coil appears to operate as I remember it did, as long as I've
>got a
>> >> sharp
>> >> pointed barb sticking out the side of the toroid to promote a
>discharge.
>> >> When I remove the barb to get a normal toroial discharge, I get
>racing
>> >> sparks along the secondary, and nothing out of the toroid, all for
>the
>> >> same
>> >> power setting as the "barbed" setup (2kva). Thus I separated the
>> secondary
>> >> from the primary in terms of vertical distance to lower any
>excessive
>> >> coupling (shooting in the dark here), but still racing arcs along
>the
>> >> secondary.
>> >>
>> >> Any ideas on the huge difference (or lack of performance) between
>> "barbed"
>> >> and "non-barbed? No component changes have been made since a
>decade ago
>> >> when
>> >> it all worked great, and both configurations performing equally
>well.
>> >>
>> >> Terry
>> >>
>> >> _______________________________________________
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>> >> Tesla@xxxxxxxxxxxxxxxxxx
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>> >>
>> >>
>> >>
>> >>
>> >
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