Letterbox CRT Tube

[Alex]

Afternoon all (or morning, depending on where you are).

I often pickup boarder line scrap equipment if it has interesting display tech in it, hence why I am a member here I guess (rarely find nixies, but have scored a few panaplax, planar and HP LED displays this way). I have, over the last year or two acquired a couple of patient monitors (Edwards Lifescience / sometimes Baxter) with a fairly odd very rectangular CRT in it that I thought was worthy of mention on here. 

Its a Computron branded assembly, tube part 115-336 DMK 5X9, made by CPT as a MI5901P4AV - CPJ 5X9. White phosphor (amber filter on the plastic).

One nice thing about this was that the monitor had a dedicated computron 115-DMX driver card for the tube, which I suspect takes a digital line sync pulse and a intensity signal then handles the scanning itself. Its a fairly well known card, I guess Edwards just bought the tube and card as a module to fit to their (insanely complex 1 foot square) main board. 

Attached is some pics. Sadly of the three of these I have acquired over the years, two have quite noticeable screen burn, but I thought it would make a good clock project tube so at least I have enough parts for developing one certain working one, rather than building something with only one being available - always a risk! Just need to come up with an enclosure design and possibly wait 30 years until I retire and have the time! Nice little micro controller project to produce the rasters and graphic sprites. Ideas for making a magnetic deflected tube look good naked would be good though - I have always liked the elctrostatic deflected projects with a nice polished tube on display...

Hope this is of mild interest, never seen such a geometry on a CRT before so thought I would share...

Cheers,

- Alex

[gregebert]

Looks like a very wide deflection angle; I recall 114 degrees was about the limit at the time, before LCDs killed CRTs.

So at least 1 screen actually powers-up, I see. 

Any chance it has a more-or-less standard 10-pin connector for video, H-sync, and V-sync ? I saw that commonly used on monitors since 1980, perhaps earlier.

[Alex]

Yeah, all the kit was working before being parted out... It is a 10 pin connector, as seen in the pic - I have had similar CRT control boards before too, often just with wires soldered to the PCB edge connector pads. I guess they must of become fairly standardised towards the end of the CRT era.

Ira mailed suggesting its similar to a Fluke 1722A display, and I agree - though that has a nice standard green phosphor.

[Tidak Ada]

There is a much narrower CRT. A special from Tektronix (154-0739-01) for recorder and copier purposes:

<  http://lampes-et-tubes.info/cr/cr018.php?l=e  >

 

eric

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