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The Tektronix Type 551, [[introduced in 1960]],  
{{Oscilloscope Sidebar
is a 27MHz [[dual-beam scopes|dual-beam scope]] that takes  
|manufacturer=Tektronix
two [[letter-series and 1-series plug-ins]].
|designers=
Unlike the [[555]], it has only one set of horizontal deflection plates. 
|series=500-series scopes
The trigger and sweep circuitry are built in to the mainframe.
|model=551
Like the 555, the 551 uses and external power supply unit.   
|summary=27 MHz scope
The external power supplies of the 555 and 551 are not interchangeable.
|image=551 front.jpg
The manual is on BAMA.   
|caption=Tektronix 551
|introduced=1958
|discontinued=1973
|manuals=
* [http://bama.edebris.com/download/tek/551/Tek%20551.pdf Tektronix 551 Manual]
* [[Media:070-245.pdf|Tektronix 551 Manual]] (bad-OCR)
* [http://www.wellenkino.de/551 Martin Mehlhose's 551 Page]
* [[Media:tek_551_fcp.pdf|Tektronix 551 Factory Calibration Procedure, January 1959]] (OCR)
* [[Media:Tek 551 fcp sep 1967.pdf|Tektronix 551 Factory Calibration Procedure, September 1967]]
}}
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]].  
 
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 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, the "indicator unit" containing the signal path electronics and CRT, and an external power supply unit.   
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]].
 
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>.
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.
 
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.
 
Early 551 units used [[UHF connector]]s.  Many were converted in the field to use [[BNC connector]]s.
 
{{BeginSpecs}}
{{Spec | CRT | [[T57]] (T551) in early, [[T5511]] in later (SN 2032+) models }}
{{EndSpecs}}
 
{| class="wikitable" style="text-align: center;"
|+Comparison of 551 with 555
! scope="col" |
! scope="col" | 551
! scope="col" | 555
|-
! scope="col" | Rise time with Type K
| 14 ns
| 12 ns
|-
! scope="col" | Acceleration Voltage
| 10 kV
| 10 kV
|-
! scope="col" | Filament Regulation
| none
| saturable core reactor
|-
! scope="row" | Price in 1965 <br />(2015 equiv.)
| $1,850 <br />($14,000) || $2,650 <br />($20,100)
|-
! scope="row" | Indicator Weight
| 52 lb (23.6 kg)
| 68 lb (30.8 kg)
|-
! scope="row" | Power Supply Weight
| 42 lb (19 kg)
| 45 lb (20.4 kg)
|-
! scope="row" | Power Consumption
| 850 W
| 1050 W
|}
 
==Links==
* [https://youtube.com/watch?v=npCHu9Shwsk Tektronix 551: A Gift from the Nuclear Energy Research Lab] @ YouTube
* [https://www.amplifier.cd/Test_Equipment/Tektronix/Tektronix_other/551.html Tek 551 @ amplifier.cd]
 
==Pictures==


A factory modification, MOD 108A, was available for increasing the CRT acceleration voltage.  This improved trace visibility at high sweep rates.
<gallery>
<gallery>
Image:551_front.jpg|Front view.
551_front.jpg|Front view
Image:551_ps.jpg|External power supply.
551_ps.jpg|External power supply
Image:551_leftint.jpg|Left side.
551_leftint.jpg|Left side.
Image:551_rightint.jpg|Right side.
551_rightint.jpg|Right side.
Image:551_top.jpg|Top view.
551_top.jpg|Top view.
Image:551 block.gif|Block diagram
551_PC_Front.jpg|front view.
Image:551 vert.gif|Vertical amplifier
551_PC_Front-close.jpg|front view closeup.
551_PC_Left.jpg|Left side.
551_PC_Right.jpg|Right side.
551_PC_Bottom.jpg|Bottom.
551_PC_lower-amp.jpg|lower beam distributed amplifier.
551_PC_Timebase.jpg|Timebase & calibration adjustments.
551 block.gif|Block diagram
551 vert.gif|Vertical amplifier
Tek 551 trigger.png|trigger schematic
Tek 551 high voltage section.png|CRT circuit
Tek 551 block.png|block diagram
Tek 551 ps bottom.jpg|bottom of power supply
1-551 001.jpg|Tek 551 Mod 108A
1-551 004.jpg|551 with Mod 108A
Wellenkino 551.jpg
Tek 551 2953 1.jpg
Tek 551 2953 2.jpg
Tek 551 2953 3.jpg
Tek 551 2953 4.jpg
Tek 551 2953 5.jpg
Tek 551 2953 6.jpg
Tek 551 2953 7.jpg
Tek 551 2953 8.jpg
Tek 551 2953 9.jpg
Tek 551 2953 10.jpg
Tek 551 2953 11.jpg
Tek 551 ps1.jpg|power supply
Tek 551 ps2.jpg|power supply
</gallery>
</gallery>
{{Parts|551}}
[[Category:500 series scopes]]
[[Category:Dual beam scopes]]

Latest revision as of 03:06, 13 November 2022

Tektronix 551
27 MHz scope
Tektronix 551

Produced from 1958 to 1973

Manuals
Manuals – Specifications – Links – Pictures

The Tektronix Type 551, introduced in 1958, is a 27 MHz 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 the trigger and sweep circuitry are built in to the mainframe. The vertical amplifiers of the 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, the "indicator unit" containing the signal path electronics and CRT, and an external power supply unit. 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.

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 VAC. 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.

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.

Early 551 units used UHF connectors. Many were converted in the field to use BNC connectors.

Key Specifications

CRT T57 (T551) in early, T5511 in later (SN 2032+) models
Comparison of 551 with 555
551 555
Rise time with Type K 14 ns 12 ns
Acceleration Voltage 10 kV 10 kV
Filament Regulation none saturable core reactor
Price in 1965
(2015 equiv.) 		$1,850
($14,000)		 $2,650
($20,100)
Indicator Weight 52 lb (23.6 kg) 68 lb (30.8 kg)
Power Supply Weight 42 lb (19 kg) 45 lb (20.4 kg)
Power Consumption 850 W 1050 W

Links

Pictures

  • Front view

    Front view

  • External power supply

    External power supply

  • Left side.

    Left side.

  • Right side.

    Right side.

  • Top view.

    Top view.

  • front view.

    front view.

  • front view closeup.

    front view closeup.

  • Left side.

    Left side.

  • Right side.

    Right side.

  • Bottom.

    Bottom.

  • lower beam distributed amplifier.

    lower beam distributed amplifier.

  • Timebase & calibration adjustments.

    Timebase & calibration adjustments.

  • Block diagram

    Block diagram

  • Vertical amplifier

    Vertical amplifier

  • trigger schematic

    trigger schematic

  • CRT circuit

    CRT circuit

  • block diagram

    block diagram

  • bottom of power supply

    bottom of power supply

  • Tek 551 Mod 108A

    Tek 551 Mod 108A

  • 551 with Mod 108A

    551 with Mod 108A

  • power supply

    power supply

  • power supply

    power supply


Some Parts Used in the 551

Part Part Number(s) Class Description Used in
120-235 120-235 • 120-0235-01 Discrete component filament power transformer 551
12B4 154-044 • 154-0044-00 Vacuum Tube (Triode) power triode 126 • 310 • 310A • 316 • 317 • 502 • 502A • 524 • 526 • 541 • 541A • 535 • 535A • 545 • 545A • 546 • 547 • 570 • 549 • 551 • 555 • 513 • 581 • 581A • 585 • 585A
5642 154-0051-00 • 154-0079-00 Vacuum Tube (Diode) directly-heated high-voltage rectifier 310 • 310A • 316 • 317 • 360 • 453 • 502 • 502A • 503 • 504 • 506 • 513 • 515 • 516 • 524 • 529 • RM529 • 533 • 533A • 535 • 536 • 543 • 543A • 543B • 545 • 545A • 545B • 547 • 551 • 555 • 556 • 560 • 561 • 561A • 561S • 564 • 567 • 570 • 575 • 581 • 581A • 585 • 585A • 647 • 647A
6AL5 154-016 • 154-0016-00 • 154-0038-00 Vacuum Tube (Dual Diode) high-perveance dual diode 163 • 181 • 190 • 1M1 • 310 • 310A • 315 • 316 • 317 • 3B1 • 3B1S • 3B2 • 3B3 • 3B5 • 502 • 502A • 503 • 511 • 511A • 512 • 516 • 517 • 517A • 524 • 526 • 535 • 535A • 545 • 545A • 549 • 551 • 565 • 570 • 581 • 581A • 585 • 585A • C • T • Telequipment D56 • Telequipment S52
6DK6 154-0149-00 • 154-0367-00 Vacuum Tube (Pentode) high-frequency miniature pentode 180 • 503 • 513 • 514 • 541 • 543 • 535 • 545 • 545A • 551 • 555
T5511 154-0186-00 • 154-0160-00 • 154-0210-00 • 154-0189-00 • 154-0143-00 CRT dual-beam CRT 551
T57 154-0186-00 • 154-0160-00 • 154-0210-00 • 154-0189-00 • 154-0143-00 CRT dual-beam CRT 551
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