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Don't forget the fundamental properties of electrostatic CRTs: deflection sensitivity is inversely proportional to EHT voltage. In magnetic CRTs there's a square root law so the deflection power doesn't increase as fast with higher EHT.
PDA overcomes this inherent problem with electrostatic CRTs. I suspect it only really works with narrow deflection angles, possibly due to geometry problems and the usual trouble of the beam hitting the deflector plates.
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