Quote:
Originally Posted by old_tv_nut
Note how the diagonal line patches get narrower in the corners as well as blurry. This looks like a yoke design limitation to me. (But it says nothing about center-screen astigmatism.)
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I may be wrong but the prewar British tube faces are very bulb like and the compressing corners to me appear to be the rounding back of the tube face. In other words, the corners are closer to the electron gun hence the narrowing of the image.