philco 21" console to fix or not

[Don Lindsly]

The 21Y and 21Z have unique bell shapes and are mechanically interchangeable only with each other. The 21Z is magnetic focus and the 21Y is electrostatic.

If the 21Y is used to replace a 21Z, then the focus magnet ass'y needs to be removed and a focus voltage applied to the focus pin. A centering ring, similar to a color TV purity ring, is also needed.

If the 21Z is used to replace a "Y", then a focus magnet and mounting ass'y is needed.

[rcaman]

it is a sg-21zp4b crt

[rcaman]

couple pictures of crt