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Re: [TCML] first light
Gary,
My tank cap is 2 strings of 20 ( .150uF, 2kV CD942 caps.) , measured with meter and it's right at .0150uF.
The sucker gap is at .240. How wide is too wide ?
I may have got a bad reading on the amps drawn , it didn't seem wright to me but thought it was due to PFC caps. If the temperature here would drop below 90 for a while will recheck !
The real first light was 6-8" with breakout point. About 4 hours over two days of moving tap point and gap widening got to an honest 34" to grounded target. I'm thrilled compared to my first coil, but still trying to get my brain around it. Realy apreciate the knowledge shared, priceless. Bob Massa
Alton,Il
--- On Tue, 7/12/11, Gary Lau <glau1024@xxxxxxxxx> wrote:
From: Gary Lau <glau1024@xxxxxxxxx>
Subject: Re: [TCML] first light
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx>
Date: Tuesday, July 12, 2011, 7:25 PM
Hi Bob,
36" isn't at all bad for first light. I'm sure mine was considerably less
when I first started out.
I didn't see any reference to what your tank capacitance is?
Your experience matches mine as far as varying power to the sucker gap
motor. You don't need ridiculous amounts of airflow when the air is
perfectly channeled in a sucker gap.
Terry filter resistors WILL get very hot - that's normal.
I've never been able to get the streamers to dance smoothly around the top
load. It may be that my 7x30 toroid is pushing the limit, but I have to use
a breakout point.
You're only drawing 4-5 Amps to the NST at 140V? Hmmm, I typically pull
20A+ to my 15/60, and that's *with* PFC caps. If your cap is seriously too
small, that could explain it. Or if your main gap was much too narrow?
Regards, Gary Lau
MA, USA
On Fri, Jul 8, 2011 at 7:51 AM, robert massa <massahbob@xxxxxxxxxxxxx>wrote:
>
> Started tuning sgtc. 15k60ma nst with 150mf pfc caps, terry filter
> ,pri- 15 turns1/4 copper tube pri 1/2 on center pancake primary tapped at
> 121/2 turn, sec- 4.25x 22.25 wound with26g mag wire, bottom turn at top
> edge of pri plane, top load 3.5"x12.5" with 6"x23" toroids stacked on top
> of each other, both are homade ductwork smoothed and covered with very
> smooth burnished foil tape, bottom of the top load is even with top winding
> of pri. Switching with sucker gap is similar to Gary Lou with 1" diameter
> hollow smooth brass electrodes, seems to work the same if vac motor is 1/2
> or full power on dimmer swich control.
> Tesla map design says should get 50" to grounded target.
> Set safty gaps on TF and main gap acourding to instructions.
> So far 36" strikes from break out point to grounded target.
> 1) The resistors on t filter get warm, but saftet gaps vaven't fired ,
> is this heat normal ?
> 2) Will not discharge with uot a break out point, even pushing 140v and
> 4.7- 5 amps input to NST. Why ? Not enough capacitance ?
> 3) Would like to see streamers dancing around toroid instead of break
> out points, am I being unrealistic with this set up ? Still
> trying to figure out how to get pics and short vid clip posted. Thanks for
> all the info from forum so far, Bob
> _______________________________________________
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> Tesla@xxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
>
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