On 12/15/2010 10:59 AM, David Forbes wrote:
On 12/15/2010 10:53 AM, Guus Assmann wrote:
Hello,
Altough it's a bit of topic, the tube doesn't contain any Neon, still
it's a disply unit.
Can anyone help me (Or actually my friend) to pinout data for a
Fairchild 7APG19 tube?
Thanks in advance.
Guus
I would expect it to be a 7AGP19, since that's a standard JEDEC part number. The
number you gave doesn't make sense.
That would be a cathode ray tube, 7" face diameter, P19 phosphor which is rather
unusual military phosphor, probably radar.
Here's the military spec sheet for it.
http://www.dscc.dla.mil/Downloads/MilSpec/Docs/MIL-PRF-1/prf1ss1178.pdf
That is a rather unusual CRT. The base is unusual, the electrical parameters are
unusual, the screen is unusual.
Note that it takes about 1000 volts to deflect the beam, so the deflection
amplifier is very hard to build.
Also note that the lifetime of the tube is only 500 hours (1000 with lower
modulation). The phosphor is quite delicate - they mention that you can't use a
beam current over two microamperes!
P19 phosphor is indeed a radar phosphor. Wikipedia offers this:
P19 (KF,MgF2):Mn Orange-Yellow 590 nm Long persistence CRT Radar screens
I have run a P12 tube (a similar long-persistence orange phosphor for radar) for
a couple hundred hours and its phosphor was damaged, so I believe this lifetime
rating. That two micorapmere beam current means you need to view the tube in a
dark room with the intensity turned up just a tiny amount.
I would call this tube a display item. You would have to do so much work to get
it to display anything on the screen, that it is best to display the tube on a
shelf.
--
David Forbes, Tucson, AZ
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