Re: I could cry......

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

Original poster: "Mike Harrison by way of Terry Fritz <twftesla-at-uswest-dot-net>" <mike-at-whitewing.co.uk>

On Mon, 16 Apr 2001 17:04:37 -0600, you wrote:

>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.
>

I think the ratings are sort of 'either-or', either 12KV OR 120mA but
not both at the same time!

>-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
>
>
>