Steven Mark´s associate Jack Durban comes forward with more info !

[dvder]

Looking at the link below. Does this not look like the Hendershot device?

http://www.youtube.com/watch?v=vnxjLWR0VXM

[Turz]

Looking at the link below. Does this not look like the Hendershot device?

http://www.youtube.com/watch?v=vnxjLWR0VXM

Look who is posting at the youtube link....... JackDurban & Vorelco...... very strange their posts are all within a week....
turz

[MeggerMan]

I found the bit about the TV repair a bit odd too, I know a lot about electronics, but it does not mean I could repair a TV set. Also valve based TVs in the 1990's, was it some kind of vintage TV repair shop?

Regarding dropping the core into a bucket of water, it depends on what kind/pureity of water.
If its completely di-ionized it should be fine. Also, its possible it may have been a very light oil he used that looked like water. A liquid conducts about 1000 times better than air if I remeber correctly.

Regards
Rob

[EMdevices]

thanks for that info Jason, it sounds interesting.

My take on this is quite simple.Ã,  Ã,  It works in conductors as well.Ã,  It's a type of eddy current phenomenon perhaps.

Here's an illustration.Ã,  Note that due to the relative velocity between a magnetic vector and charge carriers,Ã,  they are imparted a force and a current occurs normal to the disk.Ã, Ã,  This is calculated as (j = k(v x B)), where 'v' is the velocity of the charge relative to the magnetic field 'B', and 'k' a constant(conductivity).Ã,  This current density is labeled as 'j', and integrated over a surface would give the curent 'i' in amps.Ã,  Ã,  Now this current further interacts with the magneitc field, and if you do a (j x B) calculation, it results in a vector labled 'F' , orÃ,  force on the charge carriers that is imparted by the rotating magnetic vector.Ã,  So it's a type of drag, and there has to be slip or it doesn't workÃ,  (slip is relative velocity between the charge carriers draged along and the rotating B vector)Ã,  In a conductor, this results in actual drag on the disk (you can physicaly spin the disk)Ã, Ã,  the same as in an AC motor.

An intersting thing to note is that the ultimate direction for the drag is the same for (+) or (-) charges.Ã, Ã,  The actual charge that moves depends on the type of material and what the charge carriers it has.Ã,  I'm sure there are finer details to the actual motion of the charges, but this should give a good idea what's involved.Ã, 

EM

[bolt]

I found the bit about the TV repair a bit odd too, I know a lot about electronics, but it does not mean I could repair a TV set. Also valve based TVs in the 1990's, was it some kind of vintage TV repair shop?

Regarding dropping the core into a bucket of water, it depends on what kind/pureity of water.
If its completely di-ionized it should be fine. Also, its possible it may have been a very light oil he used that looked like water. A liquid conducts about 1000 times better than air if I remember correctly.

Regards
Rob

No one said he was working in tube TV's in the 90's but he did before that time. I used to work in a TV repair shop many years ago and although much of it was still changing tubes through the late 70's into 80's many sets were hybrid with transistors and tubes. Of course much comes through repetition and experience and you know if you got no EHT chances you know where to look. Getting sets in that were 10 or 15 years old was not uncommon. Many people today still have VCR's that may well be 15+ years old.

So with this experience and i had a tpu coil that kept on overheating then carefully dipping even part of the coil of wire in water that had no joins exposed and no bare contacts other then plastic covered wire is not as stupid as Jack is suggesting. Of course it could never be a lasting solution but if it proved to keep the temperature under control then other avenues could then be explored. An experimenter has the freedom to try anything once if he felt he wasn't putting himself in danger.