Watson A.Name "Watt Sun - the Dark Remover" wrote:

Terry Given wrote:
[snip]

I design lots of magnetic devices. One of the first things I do with a
prototype transformer is dismantle it - I look at insulation, wire type,
winding pitch etc, AND I specifically count the number of turns (my
Leatherman has gutted hundreds of transformers I also measure
coupling,
saturation, DC resistance, capacitance etc

If I had 2 of those bobbin core coils, I would just unwind the damn thing
and count the number of turns.


Ultimately, pay attention to John Larkin. A mate once had a 3-phase
inductor
made (for a 600kW Butterworth filter that was hopeless - fringing flux
and leakage totally ruined the current distribution, making it glow
red hot.
OTOH it made a great heater


Is this a movie of that "heater"??? :-))) (Warning: 5 Megabyte .MPG)
http://205.243.100.155/frames/mpg/XfrmBlast1.mpg

Ooh, COOL! He's got another even bigger one!! Warning: 1.5 MB .MPG
http://205.243.100.155/frames/mpg/500kV_Switch.mpg
See www.teslamania.com for the text associated with this video clip.

Cheers
Terry