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Re: power transformers
Original poster: "rob by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rob-at-pythonemproject-dot-com>
Tesla list wrote:
> Original poster: "Ed Phillips by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> Tesla list wrote:
> > Original poster: "rob by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> > Tesla list wrote:
> > >
> > > Original poster: "R. Bergmann by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> > <bergmann_-at-hotmail-dot-com>
> > >
> > > Thanks for the info and for sticking up for me.
> > >
> > > Ryan
> > >
> > No problem. I have a unique vacuum tube tesla coil here. A 3ft high 2ft
> > diam form with copper tubing. It resonates at 1.8Mhz, and is driven
> > with 3kW from an Eimac 8877 tube (It my ham linear amp). Puts out a
> > nice big purple flame. Unfortunately, the 8877 is a very expensive
> > investment and requires forced air cooling as it has an external metal
> > anode with radiator fins. My power supply is 3500V at 5kVA max (weighs
> > 200 lbs).
> > Some other tubes worth trying for a small coil would be the 1625, 811,
> > and 813. They are old WW2 vintage types and are available for
> > practically nothing ($1 to $10) at ham swap meets.
> > Rob.
> Are you driving the coil from the regular antenna output of your
> linear? Would be interesting to see more design details. How much
> power do you run on ham bands? Are you one of the 80 meter "long
Yes, I tap the coil up one or two turns for min SWR. Actually, I don't
work HF any more at all. 6M only these days. I got bored with HF and
160M DXing. (I had 250 countries on CW by the time I was 18yrs old, so
being 40 now, its lost the thrill) Worked Japan on 6M CW last fall.
That was a thrill! 73.
The Numeric Python EM Project