4" CRT B/W Video Door Phone Intercom System $29 DELIVERED

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Has Baby

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  altomic on 10/03/2015 - 11:36

  ABN 18132962540

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  [Deactivated] on 10/03/2015 - 11:39

  +1

  reminds me of the 90's

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  Hypnotoad on 10/03/2015 - 11:41

  +2

  CRT? lol - “Welcome to the World of Tomorrow!”

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  IVI on 10/03/2015 - 15:00

  Surely NOT Cathode Ray Tube (valve)?!?

  • 

    Russ on 11/03/2015 - 00:56

    +3

    Even better, it's one of the obscure types of CRT which is "backwards" compared to a normal CRT. Instead of the electron beam firing at the back of the phosphor and you viewing the image from the front of the phosphor, this tube has a side-mounted electron gun, and you are looking through the electron beam at the phosphor - on the side the electron beam hits!

    This was quite a clever invention at the time of projection TVs, because the phosphor could be deposited onto a metal plate, and achieve much better cooling than the phosphor on a conventional tube - so you could run it much brighter.

    However, because the back of the tube is a metal plate, there has to be a glass-metal seal, so the lifetime of the tube will probably be less than an all-glass conventional CRT, which has no such seal (the wires leading to the pins at the base of a conventional CRT do not require a seal, the metal alloy of the wires is carefully chosen so that it has the same thermal expansion rate as glass, and the glass adheres to it).

    Here's a similar type of TV tube, with side-mounted electron gun:
    http://en.wikipedia.org/wiki/TV80

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  [Deactivated] on 10/03/2015 - 17:08

  $29 baby monitor?

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    Do I NeedThis on 10/03/2015 - 21:45

    with wire

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  jonnois on 11/03/2015 - 01:00

  I thought it was a really chunky old game boy in the pic for a second :)