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Re: Top Toroid
In a message dated 97-02-02 02:32:11 EST, you write:
<< John,
>Wow! I didn't know that. I only tried to use a large toroid on my tube TC
>one time and it was a real bust (limited tune range). I suspect it is
>induction type heating due to the more CW nature of the systems output.
>Where the energy is delivered in a more steady fashion with longer energy
> trains. You have any ideas on why?
Richard Hull, TCBOR
>>
Richard,
Well, I assumed it was the RF induction heating effect that you mention.
Some evidence for this scenario may be provided by another tube coil
experiment that I did a few years ago:
I built a large secondary 14" by 26", and wound it with 3 different gauges of
wire; #22 on the bottom, #25 in the middle, and #28 at the top. The
secondary form was CARDBOARD (this was before I knew much about cardboard
losses). You may remember this "nightmare" coil from my tape. The top part
of the secondary got HOT! Seems like a lot of RF heating was going on here,
and spark length was reduced from all the losses. The spark was reduced from
24" using a "normal" sec, to 19" with the "monsrosity" secondary!
Robert Stephens suggests other causes also in his post. I didn't really
explore the issue.
John Freau