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It was one of the first CRTs to use electrostatic focus. Much nicer than having a big, clunky electro-magnet on the neck to adjust. Downside is it requires around 3,000 volts.
They got that from a tap on the HV secondary and used the 1V2 to rectify it.
Later design got it down to around 500 volts which they could get from the boost voltage.
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