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I know we were advised to fire up our tube-pickup (Saticon) HDTv camera at least every six months, supposedly to prevent deterioration due to gas, though I never found out if that was really the cause or how the gas would be removed by operation. Anyhow, those pickup tubes had very small cathodes and gun apertures to get the required resolution, and that's why they were so sensitive to use conditions. I never thought that "big" CRT cathodes would be so sensitive, so it will be interesting if some expert chimes in here to tell us the mechanism for deterioration.
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