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David, 72" WOW as I have similar specs but only get 36-48" or so. Here are my specs: 15kv, 120ma <-- Same (2 15kv 60mA NSTs) 3 levels of 0.010uf in parallel for 0.030uf mmc (30kv) <--- Seems like your double of what mine is 2 parallel tungsten gaps "about" 1/4" separation each (with a squirrel cage fan blowing on them) <--- *Should these be tighter since there are 2 of them? (i.e. 1/8" inch each)* Secondary - 6"dia x 31"lg 1400 turns No. 24 Top load - 6" x 25" aluminum dryer ducting and foil pizza pans with foil wrapped cardboard between and nylon toilet bolt <-- NOT wrapped in 3" aluminum tape (Would wrapping this improve the length significantly). I have the materials for an 8" aluminum dryer ducting, aluminum tape, 17.75" x 1" circular wood table (to be wrapped in foil and then glued and possibly aluminum taped). *Should I just wrap the 6" more flimsy version or go with the bigger 8" more solid heavier version (to construct) - OR use both on top (wrapped/unwrapped in aluminum tape)?* Primary 0.25" copper refrigerator coil in single layer tapped at 12.5 turns I was thinking of the rotary gap motor version for the spark gap but have no idea where to even start on this. I was hoping to get everything the best I could first before and if I go down that route. *So what has the greatest impact on spark length - the rotary spark gap or the wrapped aluminum tape on the toroid - or are both necessary?* Thoughts? Tim On Mon, Apr 6, 2015 at 8:56 PM, David <zipo@xxxxxxxxxxx> wrote: > Timothy, List - I too have recently put together a 15kv, 120ma coil. I'm > still tweaking for best out put. So far I'm getting 72" output and based on > the way it was running and the way it was tuned I believe it will do at > least 80" after it's fully peaked. I can only run outside so I'm having to > wait for good weather. > Here is a brief over view: > 15kv, 120ma > .0625uf mmc > sync rotary gap @ 120 breaks/sec > secondary - 7"dia x 27.3"lg 1500 turns No.26 wire > Top load - 5" x 20" spun aluminum toroid > primary - 10 turn 2 layer spiral > Tesla equi drive circuit. > > There are two aspects of tuning and peaking that seem not to get the > attention that they should (in my opinion). > First is that if tuning with a signal generator and a oscilloscope you > need to simulate the added capacitance of the spark. Adding a piece of wire > the length of the spark your expecting to the top load and then tune with > sig gen and o scope. This seems to be overlooked a lot. Java TC shows this > very well. If you ad an additional cylindrical top load, on JTC, .02dia x > length of spark (JTC will point it straight up) you will see a marked > reduction in res. frequency. > Second is that the safty gap or static gap width has a large impact on > output. There are way of setting these gap for safest operation. However > I'm guessing these gap widths get pushed a bit by savvy coilers but don't > talk about it. At least on a sync rotary safety gap width has a big bearing > on output. I would find it very interesting to hear what gap width people > are using with what setup. And in full disclosure :) I have set both of my > safety gaps at .22 using rounded brass draw pulls for electrodes. > It just seems to take a lot of time to get every thing tweaked to > Perfection. > > Carry on > David > > > > On 4/6/2015 9:34 AM, Timothy Gilmore wrote: > >> Has anyone put together any sort of a listing of others Tesla Coils built >> with parameters listed such as: >> >> (for example): I have 2 NSTs (15kv, 60ma) each, 6" diameter, 31" high >> secondary, torroid is .... >> >> I am getting 3-4' sparks and wondering if I should be getting longer >> sparks. Is this normal? or should I add another NST or bigger Toroid >> (working on an 8" diameter ducting bigger one). How do I know since the >> Tesla Map software says I should get "ideally" 72.6 inch sparks and I'm >> getting about 1/2 to 2/3 of that. Just wondering if it's not tuned >> properly >> (but I think it is) - or making a larger toroid is worth the effort if >> I'll >> gain a foot or more sparks. >> >> How does one know they are getting close to the best they can get in spark >> length? >> >> I have attached my Tesla Map file of current settings. >> >> Thanks, >> >> Tim >> _______________________________________________ >> Tesla mailing list >> Tesla@xxxxxxxxxx >> http://www.pupman.com/mailman/listinfo/tesla >> >> > _______________________________________________ > Tesla mailing list > Tesla@xxxxxxxxxx > http://www.pupman.com/mailman/listinfo/tesla > _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla