Quote:
Originally Posted by nasadowsk
It was better sweep circuits (and I suspect better magnetics) that allowed them to get the angle up.
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Also, a smaller diameter CRT neck allowed tighter coupling of the yoke's field to the electron beam. Ergo, greater sweep angle.
Smaller neck also meant smaller gun assembly and smaller emissive surface on the cathode, which apparently caused the notoriously short longevity of 110° tubes.