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and an external power supply unit. | and an external power supply unit. | ||
The filament current for the tubes in the indicator unit is produced by a transformer in the indicator unit, | The filament current for the tubes in the indicator unit is produced by a transformer in the indicator unit, | ||
T750 | T750 (part number [[120-235]]) that has seven isolated secondaries, each supplying 6.3 V<sub>AC</sub>. | ||
The indicator unit also contains the CRT circuit, which uses [[5642]] tubes and produces the +8650 V CRT anode voltage | The indicator unit also contains the CRT circuit, which uses [[5642]] tubes and produces the +8650 V CRT anode voltage | ||
and the | and the −1350 V voltage for the CRT cathode. | ||
The external power supply unit produces regulated DC voltages of | The external power supply unit produces regulated DC voltages of −150 V, +100 V, +225 V, +350 V, and +500 V. | ||
The external power supplies of the 555 and 551 are not interchangeable. | The external power supplies of the 555 and 551 are not interchangeable. | ||
However, the cable that connects the power supply to the indicator unit is the same for the 551 and the 555 | However, the cable that connects the power supply to the indicator unit (part number [[012-032]]) is the same for the 551 and the 555. | ||
A factory modification, MOD 108A, was available for increasing the CRT acceleration voltage from 10 kV to 12 kV | A factory modification, MOD 108A, was available for increasing the CRT acceleration voltage from 10 kV to 12 kV | ||
to improve trace visibility at high sweep rates, at the cost of reducing deflection sensitivity to 0.85 cm/Div. | |||
A graticule with 0.85 cm units was supplied. | A graticule with 0.85 cm units was supplied. | ||