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The Tektronix T5280 is a CRT used in the 528. It uses deflection blanking and does not have post-deflection acceleration. The cathode is operated at -4 kV.

Part numbers

Part No Name Phosphor
154-0525-00 T5280-31 P31 (standard)
154-0525-10 T5280-31 P31 (standard)
154-0843-10 ? P31 (standard)