T57
The Tektronix T57 aka T551 is a dual CRT used in the 551 below S/N 2032. Later models used the T5511 tube.
It has two electron guns and two pairs of vertical deflection plates, but common horizontal deflection plates.
The improvement added in the T5511 was to support a horizontal beam registration circuit that allows to compensate for stray fields in order to make the starting times of both beams coincide.
Part numbers
| Phosphor | Part No. |
|---|---|
| P1 | 154-186 |
| P2 | 154-160 |
| P5 | 154-210 |
| P7 | 154-189 |
| P11 | 154-143 |
