Re: Ballast bulk buy / Bombarder Chokes

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Steve White by way of Terry Fritz <twftesla-at-qwest-dot-net>" <slwhite-at-zeus.ia-dot-net>

Thanks for the info. I may build one of these. Does anyone know the
disadvantages of this slider-type ballast as compared to a more conventional
E and I section ballast with an adjustable air gap?

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, August 14, 2001 5:54 AM
Subject: Re: Ballast bulk buy / Bombarder Chokes


> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<Neonglo-at-aol-dot-com>
>
> In a message dated 8/12/01 4:03:24 PM Central Daylight Time, Steve White
> writes:
>
> << I would like to know the dimensions of your 5 KVA unit. I have been
>  wrestling with how to build a reliable ballast at this power level. I
would
>  like to know the following. >>
>
> Hi Steve, All,
>
> I got the measurements on the 5kVA bombarder choke today as follows:
>
> 1. Dimensions of core = 1 5/16" square by 18" long. 3.8 lbs.
>
> 2. Bobbin dimensions = 15" by 1 3/8" square ID. Constructed of tempered
> hardboard (Masonite)
>
> 3. Number of turns = Three layers of #10 solid copper, wound 9 TPI, 15"
long.
>
> I have put some pix on PhotoPoint of the choke at;
>
>
http://albums.photopoint-dot-com/j/PopUpIndex?u=1424805&a=11222029&pw=&size=smal
l
>
> Pictures 5 through 8 are of the choke. A 12.5kVA choke core is shown in
pic
> #8 along side the 5 kVA core, along with it's dimensions.
>
> << What sort of duty cycle do you get with your ballast? >>
>
> Bombarding usually calls for about 2 to 3 minutes on, and 10 to 15 minutes
> off. This equates to about a 20% duty cycle, but this can be increased
> greatly with the use of forced air across the coil. Add another layer of
> windings to decrease the low end current even more.
>
> I'd be glad to try and answer any more questions about these chokes. They
> should be simple enough to build, and should work very well with any
> non-shunted tranny, like a pole pig. I have used it before on my TC with
good
> results.
>
> Regards,
>
> Tony
> ----------------
> Tony Greer
> Special Effects Neon
> Lubbock, Texas
> "Flowing Glass and Glowing Gas"
>        ~~~SINCE 1980~~~
>
> New Geissler Gallery: http://hometown.aol-dot-com/thepacratz/xfmrs.html
> eBay Page: http://members.ebay-dot-com/aboutme/thepacratz-at-aol-dot-com/
>
>
>
>