Re: [TCML] At a loss. No light on second coil (Update)

[Scott Bogard <sdbogard@xxxxxxxxx>]

Good job!  Glad it is up and running for you!

Scott Bogard.


On Sat, Mar 30, 2013 at 11:26 PM, Andrew Webster <andrew600rr@xxxxxxxxx>wrote:

> All,
>
> I cannot thank you enough for you time helping me out with this. I
> took all of the advice that I received and went to work. I pulled it
> all down, checked it piece by piece. The big task at hand was my power
> supply. I pulled the entire thing back out of the oil and set it up on
> the workbench, hooked up one of my spare mots backwards to get a nice
> 6.3v input and started testing my phasing and wiring. Once I had that
> complete I dropped them back in the oil and started on a ballast. The
> easiest thing I could do right away was a shorted MOT.
>
> Well, I got first light tonight! And what a show it was. Seeing as I
> am still working on the ARSG I just used my sucker gap but it runs and
> runs well. I haven't even had time to tune it yet but it lives and it
> was a great show and a wonderful night!
>
> Thank you all again!
>
> Here is a video of it up and running!
>
> http://www.youtube.com/watch?v=6Nq-X-xtEGw
>
> Have a wonderful night!
>
> -Andrew
>
> On Fri, Mar 29, 2013 at 8:06 PM, Bert Hickman <bert.hickman@xxxxxxxxxx>
> wrote:
> > Andrew and all,
> >
> > David is absolutely right.
> >
> > The root cause is that your tank capacitor and gap electrodes are too
> small
> > for the current delivered by your HV power source. After the first
> "bang",
> > the high power supply current recharges your tank cap too rapidly -
> before
> > the tips of your electrodes can cool below incandescence. When the tank
> cap
> > voltage rises too rapidly, the gap
> > re-fires at a relatively low reignition voltage. If the electrode tips
> are
> > still incandescent (from the previous firing), they readily emit free
> > electrons (thermionic emission) into the gap, causing it to reignite at a
> > much lower low voltage compared to if they were cooler.
> >
> > The result is that your tank cap never has a chance to recharge to
> anything
> > near full voltage before the gap re-fires. The gap develops a fiery
> > appearance that quickly oxidizes/melts up your gap electrodes. Since the
> > "effective bang size" declines substantially, your coil's output drops
> > catastrophically - sometimes to virtually nothing!
> >
> > Bert
> > --
> > Bert Hickman
> > Stoneridge Engineering
> > http://www.capturedlightning.com
> > ***********************************************************************
> > World's source for "Captured Lightning" Lichtenberg Figure sculptures,
> > magnetically "shrunken" coins, and scarce/out of print technical books
> > ***********************************************************************
> >
> >
> > David Dean wrote:
> >>
> >> On Friday, March 29, 2013 09:26:22 AM Andrew Webster wrote:
> >>>
> >>> I swung by the local metal recycling facility yesterday and got some
> .25
> >>> inch tungsten rod I'll have to cut down and ordered a new sheet of
> >>> phenolic. I'll have the new gap up soon.
> >>
> >> So maybe it takes twice as many "few seconds" to melt the tungsten as
> the
> >> brass.
> >>
> >> In order to "cure" the power arc you need to reduce the power (via
> >> suitable
> >> ballast) to a level the coil and gap can process.
> >>
> >> IMHO
> >> _______________________________________________
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> >>
> >>
> >
> >
> >
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