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August 10th 03, 02:45 PM
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Jerry Avins wrote:
Eric Jacobsen wrote: On Fri, 08 Aug 2003 13:31:25 -0400, Jerry Avins wrote: ... It has been one of my enduring regrets that I didn't ask to keep the bulb. It was probably thrown out. Jerry I think that one may have been intended for an embassy somewhere... About a year later, I read about such a bulb in QST. The author believed that Edison-effect electrons excited a self broad-band resonance in the doubly coiled filament, sustaining oscillation by a mechanism I forget, but that seemed reasonable at the time. Incandescent lamps are filled with low-pressure nitrogen to avoid damage from the Edison effect, and interaction with the gas figured in his explanation. It was that explanation that led me to build an open-air triode. I was surprised as anyone when that worked, and I took it as a confirming instance for the now-forgotten explanation. Open-air triode?? Do tell, you have me fascinated... Rob |
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