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Tell us more.....about TC-SG




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From:  Rick L. Kirby [SMTP:rkirby-at-earthlink-dot-net]
Sent:  Saturday, March 14, 1998 1:30 PM
To:  'Tesla List'
Subject:  Re: Tell us more.....about TC-SG

Boombast99 wrote:
> 
> Rick, would like to hear more about your TC w/ the 50" spark...esp. the copper
> pipe variable speed vacuum gap,ht.of sec.,material,primary,chokes-
> protection,etc..Please post it on the list or email me.
> Thanks,Danny M. (boombast99-at-aol-dot-com)

Hi Danny,

 Here's the basics of my 6" coil now running.

sec. form...6.31"od acrylic tube 1/8" wall by 24" length.
	wound 22.5" ~1020 turns close wound w/ 24ga magnet wire.
	capped/sealed both ends w/ 1/4" lexan disks  and
	two coats behr build 50 (2 part epoxy paint) the grd tab
	(1" x 1 1/2") copper plate epoxied below bot turn
	and soldered.

toroid....(6.3"od x 25.5" ring od) alum flex duct on inverted pizza
	pan all covered with 2" alum. tape. bot. of toroid is about
	1 1/2 " above last turn on sec.

pri coil...pancake spiral 1/4" copper tubing w/ 1/4" air spaces id is
	9" x 24 3/4"od. mounted w/ 8 grooved 1/4" lexan supports under
	a slabe of 1/4" lexan 27" x 32". 16 turns tapped at 13 1/4.

spark gap...10 copper tubes (7/8" x 5" long) 9 gaps .033" ea.for
	a total gap of .297" mounted horiz. in top of a rectangular
	box quenched by a 12,000 rpm 8 amp univ. vacuum motor,
	from (amer. science & surplus $12.50) speed controlled w/ 9
	amp 0-140v variac.   

power...4 nst's 15000v/30 ma for total of 15000v/120ma for now

protection...minimal just two safty gaps one across the caps. and one 
	across the neon transformer bank with center grounded to case.
	each output of nst bank has a choke (70+ turns 14ga thhn wire on
	a 1" x 8" pvc tube) then a series resistor (2500 ohms -at- 50w).

tank caps...2 in parallel (FCI .01uf -at- 100,000 v) from Fair Radio Sales
	$95.00 ea. for a total of .02uf.

tank circuit.. inner connected with 1/4" copper tubing. all rf grounding
	is 2.5" wide alum flashing. pri tap is #4ga. fine stranded welding
	cable w/lrg clip.

controls...dual ganged 22amp 0-240v variacs for 44amps -at- 280v (running -at-
	140v max.) one 9amp/0-140v variac for vac. gap one panel mount volt
	meter 0-300vac. 2 emi filters ( 60amp 115/480v) 1 on input 1 on 
	output. 60 amp contactor and various start/stop control switches, 
	fuses ect. 

sparks...avg. 50" with some strikes measured at 60". as is. I may drive
	it with my 14,400v 5kva pole pig in the near future.

let me know if you want any more info.
safe coiling,

Rick L. Kirby