Re: Ganging 1256D's -- T5587 Choke

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

Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-uswest-dot-net>" <jimlux-at-earthlink-dot-net>

So the key thing here would be the 1.5 square inch core cross section and
the wire size.  

You should be able to figure out a reasonable turns count by looking at the
maximum voltage difference you expect between sections of the variac, and
then using one of the standard cross sectional area vs turns/volt relations.

Tesla list wrote:
> 
> Original poster: "Chuck Curran by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <ccurran-at-execpc-dot-com>
> 
> Hello Marc:
> 
> You have brought out a good point.  The Powerstat T5587 choke is nothing
> more than a small toroidal core.  It is about a 5 " O.D., 3 1/2" I. D. and
> about 1" thick.   There are two separate windings on it.  These are made
> with what appears to be about #8 wire.  This is from memory from last
> September.  Here in Wisconsin it's a bit too cold to poke around with
> coiling in the winter out on the drive way. I simply haven't rolled the
> power cabinet out of it's corner yet this year.
> It's probably $25.00 worth of electrical parts -- real nice $122 bakelite
> case, I guess! :^)
> 
> I would not buy another one of these.  I did already see Scott's comments
> about making your own, and I think he has made some good observations.  Just
> make sure to get the turns direction correctly wound.
> 
> Chuck
> 
> ----- Original Message -----
> From: "Tesla list" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Wednesday, March 14, 2001 1:01 PM
> Subject: Re: Ganging 1256D's
> 
> > Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>"
> <MShock8073-at-aol-dot-com>
> >
> > In a message dated 3/14/01 1:08:00 AM Eastern Standard Time,
> tesla-at-pupman-dot-com
> > writes:
> >
> > <<snip>>
> >
> > << I wanted a high level of reliability, so I chose to spend
> >  the money and install a Powerstat T5587 current balancing choke on the
> >  output legs of the two autotransformers.
> >
> > <<snip>>
> >
> >
> > <<Just so you are forewarned, that little current balancing choke from
> > Powerstat is expensive, I paid $147.00 several years ago through Newark
> > Electronics.  I do have the Powerstat catalog, which has the connection
> > diagrams for many combinations of product types.
> > >>
> >
> > Do you have any specs on that choke? Not that I am really 'cheap' but
> surely
> > we could build a suitable replacement for such duty for a lot less than
> 140
> > bucks. Obviously it is high current, so big wire. But, is it 140 dollars
> big
> > and/or complicated?
> >
> > Just trying to stretch my coilin' cash.
> >
> > Marc S.
> >
> >
> >
> >