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That site is wrong on the 7DP4:
"This CRT was primarily used in the RCA 621 set.
Magnetic deflection; magnetic focus"
It has Electrostatic Focus, in fact that's the thing that made it hard to rebuild, there were no guns available for it with Electrostatic Focus, all (or most) of the other round tubes, had Magnetic Focus, i.e. 10BP4, 12LP4 etc..
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