T581

The T581 is a CRT manufactured by Tektronix and used in the 581 and 585. It came with P31 phosphor standard, but was also available with P1, P2, P7, and P11. Usable viewing area is 4 cm by 10 cm.

The vertical deflection plates are distributed. The horizontal deflection plates are a conventional pair of plates.

Vertical deflection factor is 4.6 to 5.6 V/cm. Horizontal deflection factor is 18 to 21 V/cm.

10 kV total accelerating voltage is typical for the T581.