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Re: [TCML] Proper VTTC Coupling? (coil specs)

That sounds good. I have used magnet wire primaries up to 2kv on small 811A VTTCs and didn't have any problems.

Litz wire is a generic name for a technique to allow bundled wire to carry higher frequency currents with lower losses. This is one of those situations that you need a chart that uses number of strands and strand awg to check on frequency and current.
Check this site for a quick idea:    http://www.wiretron.com/litz.html

John W. G.

John W. Gudenas, Ph.D.
Professor of Computer Science
On Oct 19, 2008, at 12:30 PM, futuret@xxxxxxx wrote:


My original plan was to use 16 or 14awg wire for that reason of keeping the coil short. The 12awg wire i have is a special type which will give a primary winding height of only 2.8". The 14awg wire would give the same height. But the 16 gauge wire I have has thinner insulation and would give a much shorter coil. I agree with what you're saying and I'm going to switch to 16awg for the primary. That will increase the primary inductance, so maybe I can use fewer turns too. That will let me put the grid coil on top of the primary. I've built coils both ways; grid coil on top, grid coil below.

I do have an air variable which I plan to use to find the proper tune point, then I'll replace it with a fixed cap. Actually I have an air variable which
is in oil to withstand higher voltage and give a higher capacitance.
I've used the 4-125A tubes in previous coils, and also a 4-250A and
a 4-400A.  The last tube was defective however and gave weak sparks.
I have a good selection of mica caps.

Appearance-wise, I prefer a shorter primary coil also, so that's another
reason for me to use the 16awg wire.  It would be interesting to try
magnet wire for the primary coil.  I have some 14gauge magnet wire.
I also have some litz wire, but I forget the gauge. I seem to remember hearing that litz wire is particularly helpful above 500kHz if I remember

Thanks again,


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