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A gas-filled tube, also commonly known as a discharge tube or formerly as a Plücker tube, is an arrangement of electrodes in a gas within an insulating, temperature-resistant envelope. Gas-filled tubes exploit phenomena related to electric discharge in gases, and operate by ionizing the gas with an applied voltage sufficient to cause electrical conduction by the underlying phenomena of the Townsend discharge. A gas-discharge lamp is an electric light using a gas-filled tube; these include fluorescent lamps, metal-halide lamps, sodium-vapor lamps, and neon lights. Specialized gas-filled tubes such as krytrons, thyratrons, and ignitrons are used as switching devices in electric devices.
The voltage required to initiate and sustain discharge is dependent on the pressure and composition of the fill gas and geometry of the tube. Although the envelope is typically glass, power tubes often use ceramics, and military tubes often use glass-lined metal. Both hot cathode and cold cathode type devices are encountered.

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  1. 0liver

    What is this gunk filled container in the loft?

    We've just bought this house, and looking around the loft there is a large water container (clean) and a much smaller container next to it filled with mouldy looking gunk and a ball valve (?). This doesn't look good. But I have no idea whether it's in use or redundant and why it's gunked up like...
  2. B

    Water filled towel rail overheating

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  3. P

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  4. F

    Occasional Vibration noise after toilet filled

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  5. Dan

    Approval queue - Leave listings that aren't fully filled in Unapproved for now

    Approval queue - Leave listings that aren't fully filled in Unapproved for now. I need to work on them before they go live with just an email address and phone number in. :) Cheeeeeerrrsssss
  6. M

    Boiler filled with water due to backfilling from condensate pipe

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  7. B

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  8. 1

    New designer radiators filled with iron balls

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  9. G

    Drained, cleaned & filled system! Boiler stopped working???

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  10. Riley

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    As above. Let's try and turn them around
  11. T

    Pressure drops when 650 litre buffer tank is filled with water but no drop with air

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  12. S

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  13. J

    New toilet into old iron pipe massive gap needing filled with what ????

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  14. 3

    Cut a live plastic pipe filled with water then quickly jam a valve on. Practical? (

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  15. hammers4spanner

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  16. L

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  17. A

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  18. M

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  19. S

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  20. D

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