[Tig] OT-CRT Monitor longevity

[Simon Burley]

Jeffrey Martin wrote:

> Apologies for the off-topic posting. I am looking for information about the longevity of CRT monitors or their performance over time, and the failure rate/mechanisms that cause failure. I am having a hard time finding any sort of research on this and any suggestions are welcome.

Jeffrey,

AFAIK these are the two of the most common failures.

1. Heater - cathode short circuit: raises the black level drastically, 
along with other tell-tale signs
2. Cathode age: as the cathode wears, for a given cathode current a 
larger area of cathode is used. This results in a soft(er) picture.

Simon

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Simon Burley
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