There is a specialised type of oscillator that has negative plate - but I don't recall its name.Is there anyone left here?
If so would they like to say when and under what circumstances one might make the plate in a (special) vacuum tube negative with respect to the cathode (emitter).
The specialised oscillator was mentioned in a very old issue of Wireless World.Keep them coming, I'm definitely interested if anyone has any real details of these, or are they just myths from the past?
No - it was originally noticed as a nuisance phenomenon around the filament in lamps running on DC. They could cause interference to radio reception. In the early days it was the only way to get up to UHF, but power output was very small.Hello Ian, did you perhaps mean a reflex klystron oscillator?
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Had another crack at Google and found it:Hello Ian, did you perhaps mean a reflex klystron oscillator?
In an ordinary klystron the collector plate is nearly at the emitter potential, but still slightly positive with respect to it, but the reflector in a reflex klystron needs to be at a suitable potential to repel the travelling electrons, and could be negative.
That is actually quite close to the device which originated this question.
The article doesn't actually say its a klystron of any sort, but does support my idea that it inspired further research that led to transit time devices such as the klystron.Thank you Ian, it is indeed a primitive klystron.
https://en.wikipedia.org/wiki/Barkhausen–Kurz_tube
I didn't make any assumptions from what I read in that text. You can decide that an early experiment with the transit time effect was a primitive klystron - but some experimenters have duplicated the results with regular valves and a couple of Lecher lines.If you look at the how it works explanation you will see that it is a primitive klystron.
The plate is biased to set the electron stream oscillating to and fro, not exiting via the plate.
and how did they bias the plate?but some experimenters have duplicated the results with regular valves and a couple of Lecher lines.
Just guessing - but I assume they'd bias the plate the same way as in any Barkhausen oscillator.and how did they bias the plate?
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