Another RCA CT-100 discovery B8001599

[Electronic M]

You mean the face mask or screen mask.

Shadow mask is an internal part of the CRT behind the phosphor screen used to prevent crosstalk between each phosphor and the 2 guns that shouldn't scan that color of phosphor.

[Penthode]

That is a funny slip on my part. I should have called it the mask or the CRT surround. I guess I had crts on my brain.

Thanks.