New CRTs

10:46 pm Uncategorized

The other day at the electronics flea market I obtained a couple of new CRTs. The one below has a P2 phosphor which is brighter and more energetic than the P1 and has much longer persistence. You can light it up with one of those UV LED flashlights. Notice the inspection sticker.

New CRT - 3JP2

And the one below is a fine example of the P12 phosphor–it lights up amber. The color is similar to that of the old amber MDA monitors but the persistence is longer.

New CRT - 3JP12

5 Responses
  1. Rene :

    Date: August 25, 2010 @ 6:51 pm

    “You can light it up with one of those UV LED flashlights” – so you could get the same visual effect w/ a UV laser projector and phosphor paint on the glass of your choice.

  2. Katemonster :

    Date: October 26, 2015 @ 3:03 pm

    Hey, could I bother you to hook that P12 tube back up and take a short video of it in action? I’m doing a lot of reading and research on WWII night fighter radar systems (god it’s hard to find documentation on this stuff now) and I’d like to see just how bad the persistence effect is. The AN/APS-6 was basically used as a radar gunsight and I’m 99% sure it used a P12 tube (if the color in the manual is anything to go by,) and I would think that long persistence would be detrimental to using it that way.

  3. eric :

    Date: October 29, 2015 @ 8:19 pm

    I’ll take a look this weekend. There were several other orange long-persistence phosphors used for radar, so it’s hard to say if that’s the one that the AN/APS-6 actually used. See this CRT phosphor paper for details.

  4. Katemonster :

    Date: October 30, 2015 @ 4:34 pm

    Hey, thanks for responding! Yeah, I saw that sheet in my research. I dunno, if the phosphor ID numbers are in chronological (are they? I assume so but I don’t know) then I’d think it would have to be something pre-P22. That RADAR set came out in 1944 so I would assume P12 and P19 would be the only real options, and my bet would be on the earlier one. Although maybe P3, I guess. I really wish I could find something more technically informative than the pilot’s user manual but I don’t even know where to look.

  5. eric :

    Date: October 31, 2015 @ 3:12 pm

    OK, there’s a new post with a video. Enjoy! Your other questions may be answered by the “further reading” section at the bottom.

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