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Back to the future - new vacuum tube production

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RJSV:
? How far down can a Lab shrink the Vac Tube dimensions ?
Maybe, a Nano-machine scale device could fill some need, perhaps for Giga-Hz power device (in comm Satellite). ?

RJSV:
(oops, meant to also say)
   Perhaps the cathode heater type filament can be replaced by some alternate 'emission' causing mechanism, when on nano-scale?
Like, just a RAW electric field, causing electron emission...Or, a laser actuated emission, then modulated the traditional way...I.E. with grid between Cathode and electron receiving plate. ?

Zoli:

--- Quote from: RJHayward on March 30, 2022, 06:02:57 am ---(oops, meant to also say)
   Perhaps the cathode heater type filament can be replaced by some alternate 'emission' causing mechanism, when on nano-scale?
Like, just a RAW electric field, causing electron emission...Or, a laser actuated emission, then modulated the traditional way...I.E. with grid between Cathode and electron receiving plate. ?

--- End quote ---
Some 15-20 years ago was a promising(and very efficiently killed) display technology, called(IIRC) Surface Emitting Device. The working was by emitting electrons on short range(10-100µm, IIRC), which were hitting phosphorous layers for light emitting.
It was expected to replace the plasma displays, having the same or better color reproduction fidelity. Those electron emitters were based on (ordered)carbon nanotubes, emitting on room temperature, without vacuum.
The patents are about to expire/expired, so if anybody want to dig(I don't), happy digging, and let us know the results.

daqq:

--- Quote from: RJHayward on March 30, 2022, 05:56:57 am ---? How far down can a Lab shrink the Vac Tube dimensions ?
Maybe, a Nano-machine scale device could fill some need, perhaps for Giga-Hz power device (in comm Satellite). ?

--- End quote ---
The conventional tubes:
https://korgnutube.com/en/
https://www.thevalvepage.com/valvetek/Nuvistor/nuvistor.htm
Strange concepts using vacuum tube like concepts: https://en.wikipedia.org/wiki/Nanoscale_vacuum-channel_transistor

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