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* [[Media:Tek 551 fcp sep 1967.pdf|Tektronix 551 Factory Calibration Procedure, September 1967]] | * [[Media:Tek 551 fcp sep 1967.pdf|Tektronix 551 Factory Calibration Procedure, September 1967]] | ||
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The '''Tektronix Type 551''', [[introduced in 1958]], | The '''Tektronix Type 551''', [[introduced in 1958]], is a 27 MHz [[dual-beam scopes|dual-beam scope]] that takes two [[letter-series and 1-series plug-ins]]. | ||
is a 27 MHz [[dual-beam scopes|dual-beam scope]] that takes | |||
two [[letter-series and 1-series plug-ins]]. | |||
Unlike the [[555]], it has only one set of horizontal deflection plates and | Unlike the [[555]], it has only one set of horizontal deflection plates and the trigger and sweep circuitry are built in to the mainframe. | ||
the trigger and sweep circuitry are built in to the mainframe. | The vertical amplifiers of the [[545|545A]], 551, and 555 are identical. The 551 uses an L-C [[delay line]] for each vertical channel. | ||
The vertical amplifiers of the [[545|545A]], 551, and 555 are identical. | |||
The 551 uses an L-C [[delay line]] for each vertical channel. | |||
Like the 555, the 551 has two parts | Like the 555, the 551 has two parts, the "indicator unit" containing the signal path electronics and CRT, and an external power supply unit. | ||
the "indicator unit" containing the signal path electronics and CRT, | The external power supplies of the 555 and 551 are not interchangeable, 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. | ||
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 (part number [[120-235]]), that has seven isolated secondaries, each supplying 6.3 V<sub>AC</sub>. | ||
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 and the −1350 V voltage for the CRT cathode. | ||
The indicator unit also contains the CRT circuit, which uses [[5642]] tubes and produces the +8650 V CRT anode voltage | |||
and the −1350 V voltage for the CRT cathode. | |||
The external power supply unit produces regulated DC voltages of −150 V, +100 V, +225 V, +350 V, and +500 V. | The external power supply unit produces regulated DC voltages of −150 V, +100 V, +225 V, +350 V, and +500 V. | ||
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. | ||
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. | ||