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On Wed, 11 Jan 2006 14:53:07 -0600, "Tim Williams"
wrote: "John Larkin" wrote in message news ![]() Old vintage noise figure meters used gas tubes. And I think there was a pencil tube that mounted in a waveguide and made shot noise. I've got a gaussian noise generator, some SS in the power supply, tubes everywhere else, found it on the curb and apparently works. Uses a pair of 6D4 thyratrons in magnetic fields for the noise. Tim GR? John |
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Electronic tuning (high voltage varactors) | Homebrew |