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 Interesting direct view C.R.T.
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 Return to top of page · Post #: 1 · Written at 7:37:41 PM on 26 May 2015.
Labrat's avatar
 Labrat
 Location: Penrith, NSW
 Member since 7 April 2012
 Member #: 1128
 Postcount: 385

In the submitted picture you will see a picture tube with the electron gun assembly facing upwards.
You will also notice that the phosphor screen is facing towards you. The phosphor screen is in fact angled inwards at the top, (like a drive-in screen).

Door phone screen


Earlier versions of this intercom monitor had a conventional picture tube with a mirror above the screen angled at 45 degrees towards the viewer. This I shall post a photograph of at a later date.

These intercom monitors are the last of their type. The end of an era. All of our new installations are of the colour L.C.D. type. All of the cameras that we install are also colour. Whenever there is a failure of a B+W camera, unless it is an obsolete type, it is replaced with a colour type.

I have my annual leave soon, and will have time to post some pictures of interesting electronic items.

Wayne.


 
 Return to top of page · Post #: 2 · Written at 6:02:30 AM on 27 May 2015.
Wa2ise's avatar
 Wa2ise
 Location: Oradell, US
 Member since 2 April 2010
 Member #: 643
 Postcount: 831

Looks like a Sony Watchman CRT, like this below:

Sony made these in the late 80's, maybe yours was late production they got a good deal on.

The horizontal deflection is varied over the course of a vertical scan, less amplitude for the top lines, and slowly increases as the scanning goes down the CRT screen, to a max at the bottom. To get the raster rectangular instead of a keystone shape.


 
 Return to top of page · Post #: 3 · Written at 9:29:46 PM on 6 June 2015.
Maven's Gravatar
 Maven
 Location: Canberra, ACT
 Member since 23 August 2012
 Member #: 1208
 Postcount: 584

Have to wonder about the radiation directed outwards from these hyperbolic screens? I suppose very low power from the gun, but surely some radiation and no protective screen like a CRT?

Maven
 
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