This CRT has electrostatic deflection and focusing and is suitable for either symmetrical or asymmetrical voltages.
Manufacturers were free to strap A3 to the internal coating if they wished, in which case the connection to pin 7 was omitted.
Looking at the screen with the base spigot uppermost, a +ve voltage on X1 will deflect the spot left and a +ve on Y1 will deflect it upwards.
Donated by Bryan Lonsdale
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