Failure mechanism of TV tubes

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Abstract
In an attempt to extend the life of TV tubes, several factors causing the failure of TV tubes have been studied. The residual gas composition in TV tubes operating for more than 5000 h, and the residual gas in many TV tubes after failure has been analyzed with an omegatron. With the aid of AES, SEM, and SIMS the coating and the base metal of the oxide-coated cathodes have also been studied. It has been found that the main source of gas release is the EID of the fluorescent screen. The rate of desorption decreases with time. The influences of the coating materials and technology on EID have been measured. The method of reducing EID is discussed. A barium film getter is able to sorb a large number of oxy-gases, but it also introduces some argon into the tubes. The getter containing the argon, the sorption mechanism of argon, and a way to lower the argon pressure have been studied in some detail.

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