Quote:
Originally Posted by vol.2
What do you mean "cook?"
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So CRTs have this thing in them called a getter that is made of highly reactive metals that soaks up gas molecules. The cathode that makes the electron beam is also made of highly reactive metals, so when the CRT isn't run for a prolonged period and starts to act like a getter and react with gas forming insulative oxides on the cathode that block emissions. When you run the tube you boil those gas molecules off the cathode...The longer you cook the cathode at normal or slightly elevated heater voltage while drawing test or operating cathode current the larger the percentage of the accumulated gas leaves. The tubes emissions will wake up as it cooks.