Just for fun...

Discussion in 'General Electronics Chat' started by Hypatia's Protege, Mar 6, 2015.

  1. Hypatia's Protege

    Thread Starter Distinguished Member

    Mar 1, 2015
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    So here's a simple 'poser' I submit to various electronics fora upon which I participate -- that said I don't think it's particularly 'Googleable'...

    Q) What is the purpose and nature of a high vacuum, hot-cathode, diode which draws a mere 100mA (Max) @ 100kV

    Hints
    Application, obviously, is NOT rectification.
    Device is in very wide (one might even say ubiquitous) use to this day.

    Best regards
    HP

    PS as I understand posting policy, a post of this nature is acceptable here, if not, please educate me as to the error of my ways (i.e. direct me to the appropriate forum) :)
     
  2. bertus

    Administrator

    Apr 5, 2008
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    Hello,

    A rontgen tube will be the purpose for the 100 mA @ 100 kV.

    Bertus
     
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  3. kubeek

    AAC Fanatic!

    Sep 20, 2005
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    Hmm, imagine those 10kW running continuously :D
     
  4. WBahn

    Moderator

    Mar 31, 2012
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    100keV is at the upper end of the X-ray region, so I'm going to guess you are talking about some kind of X-ray tube.

    As for being a "mere" 100mA, given that 100mA at 100kV is 10kW, I don't know that I would classify that as a "mere" level of current.
     
  5. Hypatia's Protege

    Thread Starter Distinguished Member

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    Well, actually, a Coolidge (hot cathode) tube -- Still you got it in one! Golly! golly! Usually this quiz creates a mile-long thread:mad: -- Good call!!!

    That'd be fluorosocopy at full current -- Now you've got me smelling burning dielectric oil :eek:

    Best regards
    HP
     
  6. bertus

    Administrator

    Apr 5, 2008
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  7. Hypatia's Protege

    Thread Starter Distinguished Member

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    Indeed! Though you must admit that it is shockingly (NPI) paltry for a thermionic device operating at that anode potential (and a white-hot filament) :cool:

    Best regards
    HP
     
    Last edited: Mar 6, 2015
  8. Hypatia's Protege

    Thread Starter Distinguished Member

    Mar 1, 2015
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    I used to have a lot of 'fun' with this -- As a new member on certain fora I'd feign 'nubieism' for about a week then ask:

    "I found this tube in a junk shop that looks like a bottle with a hockey-puck inside I don't think it's gassy because it doesn't glow when I hit it with my TC -- even with the filament bright it doesn't draw much current... [then I'd close the post with something like] gotta go I haven't been feeling well lately..." then watch the veritable flood of mingled advice, sympathy and outrage -- rarely did anyone spot the connection to my username to wit: "ARS" ;)

    Don't worry I'm 'all gwod up now' and will refrain from such antics here :D
     
    Last edited: Mar 7, 2015
  9. MaxHeadRoom

    Expert

    Jul 18, 2013
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    I guess you are getting ready to celebrate on the 15th?;)
    Max.
     
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  10. Hypatia's Protege

    Thread Starter Distinguished Member

    Mar 1, 2015
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    OK I give up --- What relation has the Ides to my post?

    With quizzical regards :)
    HP
     
  11. MaxHeadRoom

    Expert

    Jul 18, 2013
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    A reference to your avatar!:)
    Max.
     
  12. Hypatia's Protege

    Thread Starter Distinguished Member

    Mar 1, 2015
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    Oh that... Actually my avatar is not a depiction of Cleopatra --- howbeit I think you get it... ;)

    Best regards
    HP
     
    Last edited: Feb 5, 2016
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