06-04-2017, 10:51 AM
There's a fascination video from Tektronix (if you can stand the ghastly '60s background "music") about making ceramic CRTs, specifically why it was done.
The primary reason was the variability of the glass in glass CRTs - repeatability was a real problem - and this caused issues with the ever-increasing performance needed from the tubes...
...so they moved away from pyrex etc. and went to ceramic - the coefficient of expansion of the faceplate/gun assembly and the ceramic body had to match perfectly.
Anyway, great video if you can stand it !
The primary reason was the variability of the glass in glass CRTs - repeatability was a real problem - and this caused issues with the ever-increasing performance needed from the tubes...
...so they moved away from pyrex etc. and went to ceramic - the coefficient of expansion of the faceplate/gun assembly and the ceramic body had to match perfectly.
Anyway, great video if you can stand it !
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