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Further, if you rejuvenated the tube with a CRT tester, bear in mind that any improvement you may notice won't last long, so it is probably just as well that you will have to replace the tube. Rejuvenation is usually done only to restore a CRT to usable condition (albeit dim) until the tube can be replaced; it is not meant to be a permanent fix. The tube will eventually dim again, at which point it must be replaced. CRT brighteners were often used in the 1950s-'60s to extend the usable life of dimming tubes, but again, this was only a stopgap measure and usually resulted in a dim CRT again within months; the only solution in this case was either to replace the tube or the TV.
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Jeff, WB8NHV Collecting, restoring and enjoying vintage Zenith radios since 2002 Zenith. Gone, but not forgotten. Last edited by Jeffhs; 12-20-2018 at 07:13 PM. |
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See reply #218.
http://www.videokarma.org/showthread...master&page=15 |
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This tube is a round 21fjp22. The TV had a brightener on it when I had acquired it, but would not produce much of any kind of image initially. On the tester none of the guns would show any readings until the rejuvenation was performed. The difference afterwards resulted in a picture that was very impressive in a lit room (compared to an extremely dark unfocused looking picture in a dark room). I suppose I had hoped maybe this would be a fairly long term fix.
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Rejuvination is risky use all safer measures first.
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Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
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Agree 110%. Rejuv only after all other measures (including CRT brightener) have failed. Learn't that the hard way many moons ago. |
Audiokarma |
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