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#1
03-22-2009, 09:21 PM
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10kp7a crt
I had mentioned a while back that fair radio in Lima, OH. had some crt's. I did make a list of regular picture tubes. The rest were military surplus. I have found out that pretty much those were scope or radar tubes.There are some (10kp7a) as an ex. that test fine on my tester if I set it up for a 10bp4a. I am curious, would this be ok for a tv, or is the coating on the screen wrong? From the front it is very white. But, I will admit I do not know pretty much anything about crt's. I have been into old radios for years but started on tv's fairly recently. Also, can someone help me identify a 16 inch round crt that has metal on the sides and is glass on the front and neck? Thanks!
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#2
03-22-2009, 09:37 PM
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there are two phosphors, a quick one that's bluish and a long one that's yellow which takes a long time to extinguish once excited. They make poor TV CRTs.
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#3
03-22-2009, 09:38 PM
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The P7 suffix indicates a radar screen with a blue-white fluorescence, instead
of white for a standard P4 television tube. Other people more familiar with radar CRTs will tell you more about the use of such a tube in a TV. See this link for an extensive table of CRT phosphors: http://amfone.net/Amforum/index.php?...0;attach=10886 Last edited by electroking; 03-22-2009 at 09:47 PM. Reason: corrected spelling
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#4
03-22-2009, 11:31 PM
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David is correct in that they don't work all that well for TV viewing, they produce a somewhat odd looking image. However, I use a 7JP7 as a test CRT for electrostatic sets and it works well for that purpose. Using that tube as a test results in less handling of the good P4 tube.
Steve
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