Re: I could cry......

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

Original poster: "Peter Lawrence by way of Terry Fritz <twftesla-at-uswest-dot-net>" <Peter.Lawrence-at-Sun-dot-com>


I am very puzzled by this claim. A 12-120 NST actually puts out about
6-kv at 60-ma when in service in a neon sign, and I've disected some NSTs
and measured their iron core cross section area and that always seems to
agree with 6 x 60 => 360 watts for this example, not 1440 or 2880 watts.

I've never seen an NST whose core cross section would support its face-plate
rating kV x mA (as opposed to other kinds of power transformers).

It was my understanding (possibly incorrect...) that core cross section
determines maximum power transfer because the cross section limits the
magnetic field energy and therefore the secondary power output.

Can anyone clarify this issue?

-Peter Lawrence.  


>> > What is the max I can expect for arc length with a 12/120? I got a 
>feeling 
>>  > I'm TERRIBLY inefficiant right now. 
>>  
>>  65"  SRSG would help.
>
>It is helpful to keep in mind that a NST with a SRSG (or even with
>a static gap), can provide double its rated power, esp if a step-up
>type variac is used.  For instance, a 12/120 NST, although rated at
>1440 watts, can actually deliver 2880 watts.  With this power, an
>efficient coil should give 91" sparks.
>
>John Freau