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#1
08-08-2008, 05:41 PM
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CRT Operating Hours until Ion Burn Appears
Hi,
does somebody knows how long a non-aluminised CRT without ion trap can be used until an ion burn is visible on the screen? I have an English PYE LV30 with a MW22-17, this CRT has a slight ion burn: http://upload.wikimedia.org/wikipedi...OnTVscreen.jpg I tested the CRT, and it has more than 1.2 mA cathode current, so I assume that this CRT was not used very much. Kind regards, Eckhard Last edited by yagosaga; 08-08-2008 at 05:44 PM. Reason: URL corrected 
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#3
08-10-2008, 08:58 PM
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Hello Eckhard,
I found this on page 385 of Theory and Design of Television Receivers by Sid Deutsch (McGraw-Hill, 1951): "The ions cause chemical contamination of the screen phosphor after several hours of operation, to the extent that a visibly darkened center area is produced. This is known as the ion spot." There are about four pages of discussion and diagrams. Roger
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