Quote:
Originally Posted by Zenith26kc20
Electrostatic tubes suffer from ion burn over the entire face. There is no ion trap nor are they aluminized. As the phosphor degrades over time the electron gun can still be good but the phosphor will get dimmer from ion bombardment. My 8jp4 is bright and clear. The set it came from probably failed early on. Some of my 7jp4 tubes have to be watched in the dark.
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As they say, "What he said ^^^". Totally my observation as well.