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Originally Posted by Steve K
I believe that those CRTs have the standard white phosphor but have a purple filter in front.
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Steve is correct. I own a PYE LV30 with such a purple filter in front:
http://bs.cyty.com/menschen/e-etzold...e/img/LV30.jpg
The CRT is a common MW22-17 (with an ion burn in the middle of the screen). This purple filter was used to suppress reflections on the screen and to generate more contrast.
Eckhard