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{{Oscilloscope Sidebar |
{{Oscilloscope Sidebar  
title=Tektronix 555 |
|manufacturer=Tektronix
summary=Dual beam 30 MHz scope |
|series=500-series scopes
image=Tek 555 front fl2.jpg |
|model=555  
caption=Tektronix 555 front |
|summary=Dual beam 30 MHz scope  
introduced=1959 |
|image=Tek_555-wTrace.jpeg
discontinued=1970 |
|caption=Tektronix 555 front  
manuals=
|introduced=1959  
* [http://w140.com/mmm/tek-555.pdf 555 manual hosted locally]
|discontinued=1970  
* [http://bama.edebris.com/manuals/tek/555 555 manual on BAMA (offline?)]
|designers=
|manuals=
* [[Media:070-165.pdf|555/21A/22A Manual 070-165]]
* [[Media:070-403.pdf|555/21A/22A Manual 070-403]]


* [http://w140.com/tek_555_additional_trigger_source_mod.pdf Modification for Additional Trigger Sources]
* [[Media:070-227.pdf|555 Operator's Handbook]] (bad-OCR)
* [[Media:040-0328-01.pdf|Modification for Additional Trigger Sources (PDF, OCR, bad-OCR)]]
* [[Media:Tektronix 21a-22a.pdf|21A and 22A section of 555 manual]]


* [http://w140.com/tek_555_operators_handbook.pdf 555 Operator's Handbook (PDF)]
<small>
* [[Media:070-227.pdf|555 Operator's Handbook (PDF, OCR, bad-OCR)]]
'''Alternate copies'''
* [https://bama.edebris.com/manuals/tek/555 @ BAMA]
'''Modifications'''
* [[Media:040-0328-01.pdf|Modification for Additional Trigger Sources]] (bad-OCR)
* [[Media:tek_555_fcp.pdf|555 Factory Calibration Procedure]] (OCR)


<!-- * [[Media:tek_555_german_intro.pdf|German Introduction the 555 (PDF, OCR)]] -->
'''Calibration'''
* [http://w140.com/Tektronix_555_dt._Kurzanleitung.pdf German Introduction the 555 (PDF, OCR)]
* [[Media:tek_type_21_22_fcp.pdf|Type 21 and 22 Factory Calibration Procedure]] (OCR)
* [[Media:Tek 555 cal outline.pdf|Tektronix 555 Calibration Outline]]


* [[Media:tek_555_crt_specs.pdf|555 CRT Specs (PDF, OCR)]]
'''Specifications'''
<!-- * [http://w140.com/tek_555_crt.pdf 555 CRT Specs (PDF)] -->
* [[Media:tek_555_crt_specs.pdf|555 CRT Specs]] (OCR)


* [[Media:tek_555_fcp.pdf|555 Factory Calibration Procedure (PDF, OCR)]]
'''Other'''
<!-- * [http://w140.com/tek_fcp/tek_555_fac_cal.pdf 555 Factory Calibration Procedure (PDF)] -->
* [[Media:tek_555_section_21a_22a.pdf|21A and 22A section of 555 manual]] (bad-OCR)
 
* [[Media:555 compatibility notes.pdf|Notes on the compatibility of 555 plug-ins and mainframe]]
* [[Media:tek_type_21_22_fcp.pdf|Type 21 and 22 Factory Calibration Procedure (PDF, OCR)]]
* [https://w140.com/Tektronix_555_dt._Kurzanleitung.pdf German Introduction the 555] (OCR)
<!-- * [http://w140.com/tek_fcp/tek_type_21_and_22_factory_cal_proc.pdf Type 21 and 22 Factory Calibration Procedure (PDF)] -->
</small>
 
* [[Media:Tektronix 21a-22a.pdf|21A and 22A section of 555 manual (PDF)]]
* [[Media:tek_555_section_21a_22a.pdf|21A and 22A section of 555 manual (PDF, OCR, bad-OCR)]]
}}
}}
The '''Tektronix Type 555''', nicknamed "Triple Nickel", is a [[dual-beam scopes|dual-beam CRT oscilloscope]] introduced by Tektronix in  
The '''Tektronix Type 555''', nicknamed "Triple Nickel", is a [[dual-beam scopes|dual-beam CRT oscilloscope]] introduced by Tektronix in  
[[introduced_in_1959|1959]] and made until the late 1960's, when it was replaced by the [[556]].  
[[introduced_in_1959|1959]] and made until the late 1960's, when it was replaced by the [[556]].  
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The Tektronix 555 takes two [[letter-series and 1-series plug-ins|letter-series or 1-series vertical plug-ins]]
The Tektronix 555 takes two [[letter-series and 1-series plug-ins|letter-series or 1-series vertical plug-ins]]


== Type 21 and 22 Timebases ==
{{BeginSpecs}}
{{Spec | Bandwidth | DC to 30 MHz, 3 dB down at 30 MHz ±0.5 dB (with [[K|Type K plug-in]]) }}
{{Spec | Rise time | 120 ns}}
{{Spec | External Horizontal Input | 0.2 V/cm to 20 V/cm, DC to 240 kHz }}
{{Spec | Sweep Rates | 100 ns/div to 5 s/div (Type 21 and 22)}}
{{Spec | External Trigger Level  | 0.2 V to 10 V}}
{{Spec | Calibrator  | ~1 kHz, 200 μV<sub>p-p</sub> to 100 V<sub>p-p</sub>}}
{{Spec | CRT | [[T5550]], 10 kV acceleration, P2 [[phosphor]] standard (P1, P7, P11 optional).  Usable area: Total 6 cm, 4 cm per beam, 2 cm overlap between beams }}
{{Spec | Line Voltage | 105 to 125 V or 210 to 250 V, 50/60 Hz}}
{{Spec | Power Consumption | 1050 W}}
{{Spec | Dimensions | Indicator Unit, 24"×13"×20"; Power Supply Unit, 17.5"×13"×10" (LWH)}}
{{Spec | Weight | Indicator Unit, 68 lb; Power Supply, 45 lb}}
{{Spec | Cooling | AC Fan for both Power Supply and Indicator Unit}}
{{EndSpecs}}
 
==Internals==
=== Type 21 and 22 Timebases ===
The 555 uses special horizontal plug-ins that contain the trigger and sweep.   
The 555 uses special horizontal plug-ins that contain the trigger and sweep.   
Early instances of the 555 came with the 21 and 22 horizontal plug-ins.  
Early instances of the 555 came with the [[21 (plug-in)|Type 21]] and [[22|Type 22]] horizontal plug-ins.  


Type 21 is suggested for the upper beam and type 22 is suggested as the lower beam time base, as type 22 contains delayed trigger, and only the lower beam horizontal section is provided with delayed trigger pickup circuitry. The Delay multiplier control pot is also provided on the lower beam section.  
Type 21 is suggested for the upper beam and type 22 is suggested as the lower beam time base, as type 22 contains delayed trigger, and only the lower beam horizontal section is provided with delayed trigger pickup circuitry. The Delay multiplier control pot is also provided on the lower beam section.  
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A rigid plug-in extension for the timebases (part number [[013-013]]) was included with every 555.
A rigid plug-in extension for the timebases (part number [[013-013]]) was included with every 555.


== Type 21A and 22A Timebases ==
=== Type 21A and 22A Timebases ===
Later instances came with the 21A and 22A horizontal plug-ins, which use [[tunnel diodes]] for triggering.   
Later instances came with the [[21A]] and [[22A]] horizontal plug-ins, which use [[tunnel diodes]] for triggering.   
Delayed triggering is supported.   
Delayed triggering is supported.   
Since the 555 is a dual-beam scope, it is also possible to start one of the sweeps while the other beam is sweeping.   
Since the 555 is a dual-beam scope, it is also possible to start one of the sweeps while the other beam is sweeping.   
The upper-beam sweep and lower-beam sweeps are, in fact, totally independent.   
The upper-beam sweep and lower-beam sweeps are, in fact, totally independent.   


== Power Supply and Filament Supply Regulator ==
=== Power Supply and Filament Supply Regulator ===
The external power supply unit generates all the B+ Voltages (–150, +100, +225, +330, +350 and +500 V) required by the indicator unit.
The external power supply unit generates all the B+ Voltages (–150, +100, +225, +330, +350 and +500 V) required by the indicator unit.
These are fed to the indicator unit through the interconnect cable.
These are fed to the indicator unit through the interconnect cable.
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A saturable inductor, located in the power supply unit, is connected in series with its primary as the control element of an AC regulator circuit.
A saturable inductor, located in the power supply unit, is connected in series with its primary as the control element of an AC regulator circuit.
One 6.3 V winding from the indicator unit filament transformer is fed back through the interconnection cable (part number [[012-032]])  
One 6.3 V winding from the indicator unit filament transformer is fed back through the interconnection cable (part number [[012-032]])  
to supply heaters of specific tubes in the power supply unit (V624, V634, V664, V684, V694).  Moreover, a regulator Tube (2AS-15, a  
to supply heaters of specific tubes in the power supply unit (V624, V634, V664, V684, V694).  Moreover, a regulator Tube (2AS-15, a Temperature Limited Diode)  
Temperature Limited Diode) is used to sense this filament voltage and derive a control DC current through the saturable inductor,  
is used to sense this filament voltage and derive a control DC current through the saturable inductor, thereby closing the control loop.
thereby signal closing the control loop.


One of the consequences of this scheme is that it the power supply unit will not energize the plate voltages (except +100 V)  
One of the consequences of this scheme is that it the power supply unit will not energize the plate voltages (except +100 V) without the indicator unit connected, because  
without the indicator unit connected, because  
* the 12AX7 comparators and 6AU6 error amplifiers are heated from the indicator unit, so the main series pass tubes (6080s and 12B4s) are not driven even though they are heated from a transformer in the power supply unit;
* the 12AX7 comparators and 6AU6 error amplifiers are heated from the indicator unit, so the main series pass tubes (6080s and 12B4s) are not driven even though they are heated from a transformer in the power supply unit;
* The primary of the plate voltage transformer inside the power supply unit is looped via the thermal cutout in the indicator unit, i.e. the plate voltage transformer in the power supply will not get power unless the indicator unit is attached.
* The primary of the plate voltage transformer inside the power supply unit is looped via the thermal cutout in the indicator unit, i.e. the plate voltage transformer in the power supply will not get power unless the indicator unit is attached.
Even if one were to power up the power supply itself by bypassing the thermal cut-out and applying local heater voltages to the tubes normally supplied by the indicator unit, the power supply will not regulate as the design employs shunting resistors across the series pass tubes, and can therefore not regulate without a load.
Even if one were to power up the power supply itself by bypassing the thermal cut-out and applying local heater voltages to the tubes normally supplied by the indicator unit, the power supply will not regulate as the design employs shunting resistors across the series pass tubes, and can therefore not regulate without a load.


== Vertical Amplifier ==
=== Vertical Amplifier ===
The Tektronix 555 has a six-section differential [[distributed amplifier|distributed vertical output amplifier]]
The Tektronix 555 has a six-section differential [[distributed amplifier|distributed vertical output amplifier]] made of [[6DK6]] tubes.   
made of [[6DK6]] tubes.  It is the same as the vertical output amplifier inthe [[551]] and the [[545|545A]].   
It is the same as the vertical output amplifier in the [[551]] and the [[545|545A]].   
An L-C [[delay line]] is between the vertical output amplifier and the CRT vertical deflection plates
An L-C [[delay line]] is located between the vertical output amplifier and the CRT vertical deflection plates for each channel.   
for each channel.   
 
Twelve 6DK6 tubes per beam are used in the main amplifier. 
A pair of [[6DK6]]s are used to pick up the trigger signal from the differential drive, and pass it to the horizontal plug-in via a cathode follower as a single-ended trigger signal.


12 x6DK6 tubes are used as main amplifier per beam, 6 each for the push and pull section.
Another pair of [[6DJ8]]s are used as grid-line driver cathode followers, fed by the [[12BY7]] input driver stage, which takes the differential input from the vertical plug-in.
A pair of [[6DK6]] are used to pick up the trigger signal from the differential drive and pass it to Horizontal plug-in as single ended trigger signal via a cathode follower.
A pair of triodes out of [[6DJ8]]s are used as amplifier to drive beam position indicator neons near the CRT.
Another pair of [[6DJ8]] are used as grid line driver cathode followers, fed by the [[12BY7]] input driver stage, which takes the differential input from Vertical plug-in.
A pair of triodes out of [[6DJ8]]s are used as amplifier to drive beam position indicator neons near CRT.


Architecturally, the 555, with its four plug-ins, is similar to the [[7844]].  
Architecturally, the 555, with its four plug-ins, is similar to the [[7844]].  


== CRT Circuit ==
=== CRT Circuit ===
The CRT circuit in the 555 is really two separate modules.   
The CRT circuit in the 555 is really two separate modules.   
It is split between two internal metal enclosures, each one containing a high voltage transformer and associated tubes.
It is split between two internal metal enclosures, each one containing a high voltage transformer and associated tubes.
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==Links==
==Links==
* [https://lazyelectrons.wordpress.com/2019/11/10/tektronix-555-restore/ Tektronix 555 Restore/Repair with Videos at Lazy Electrons Blog]
* [https://www.youtube.com/watch?v=BvbNBZX6kNE Tektronix 555 in operation] @ YouTube
* [https://www.youtube.com/watch?v=BvbNBZX6kNE Tektronix 555 in operation] @ YouTube
* [http://www.barrytech.com/tektronix/vintage/tek555.html Tektronix 555 @ barrytech.com]
* [http://www.barrytech.com/tektronix/vintage/tek555.html Tektronix 555 @ barrytech.com]
Line 115: Line 135:
<gallery>
<gallery>
Tek 555 front fl2.jpg
Tek 555 front fl2.jpg
Tek 555 front fl.jpg|front view: two timing plug-ins on top and two vertical plug-ins on bottom
Tek 555 front fl.jpg     |front view: two timing plug-ins on top and two vertical plug-ins on bottom
Tek 555-CA.jpg | Tek 555 with CA Dual Trace Plug-ins
Tek_555-Delayed-Trace.jpg | Tek 555 in Delayed Trigger Mode
Tek_555-Delayed-Trace.jpg | Tek 555 in Delayed Trigger Mode
555_ps.jpg|external power supply
555 P11.JPG         | 555 with P11 [[phosphor]] option
555_left_int.jpg|left side view
555_P7.jpg         | 555 with P7 [[phosphor]] option (fast blue / slow green)
Tek_555-LHS.jpeg | 555 Internals LHS (Upper Beam)
Tek 555 1050 1.jpg
555_rt_int.jpg|right side view
Tek 555 1050 2.jpg
Tek_555-RHS.jpeg | 555 Internals RHS (Lower Beam)
Wellenkino 555-2.jpg  
555_top_int.jpg|top view
Tek_555_Top.jpg | 555 Top with with HV Cover off
Tek-555-Bottom.jpeg | 555 Bottom
Tek_555_V-Amp.jpg | Vertical Amplifier (Lower Beam)
555 P11.JPG|555 with P11-option
555_P7.jpg|555 with P7-option (fast blue and slow green Phosphor)
Tek-555-PS-Front.jpg | 555 Power Supply - Front
Tek-555-PS-Rear.jpg | 555 Power Supply - Rear
Tek-555-PS-Top.jpg | 555 Power Supply Internals - Top
Tek-555-PS-Bottom.jpg | 555 Power Supply Internals - Bottom
Tek 555 cable 3.jpg|Power interconnect, part number 012-032
Tek 555 cable 2.jpg|Power interconnect, part number 012-032
Tek 555 cable 1.jpg|Power interconnect, part number 012-032
Tek 555 timebase interconnect3.png|timebase interconnect
Tek 555 block.png|555 block diagram
555 lower vert.png|lower beam vertical amplifier
Tek 555 power interconnect.png|power interconnect
Tek 555 lvreg.png|heater regulator
Tek 555 21 trigger.png|Type 21 trigger
Tek_555_block.png|block diagram
Tek 555 crt circuit.png|CRT circuit
Tek 555 crt1.jpg|CRT
Tek 555 crt2.jpg|CRT
Tek 555 crt3.jpg|CRT
Tek 555 crt4.jpg|CRT
Tek 555 crt5.jpg|CRT
Tek 555 crt6.jpg|CRT
Tek 22a front.jpg|22A front
Tek 22a trigger board.jpg|22A  TD trigger board
Tek 22a top.jpg| 22A top
Tek 22a bottom.jpg| 22A bottom
Tek 21 front.jpg| 21 front
Tek 21 top.jpg| 21 top
Tek 21 bottom.jpg| 21 bottom
Tek 22 front.jpg| 22 front
Tek 22 top.jpg| 22 top
Tek 22 bottom2.jpg| 22 bottom
Tek 21a front.jpg| 21A front
Tek 21a top.jpg| 21A top
Tek 21a bottom.jpg| 21 bottom
Tek 21a trigger board.jpg| 21A TD trigger board
Tek 013-013.JPG|timebase plug-in extender, part number 013-013
Wellenkino 555-2.jpg
Wellenkino 555.jpg
Wellenkino 555.jpg
Tek 555 rear.jpg|555 rear
Tek 555 rear.jpg|555 rear
Tek 555 1050 1.jpg
Tek 555 rear on cart.jpg
Tek 555 1050 2.jpg
Tek 555 1050 3.jpg
Tek 555 1050 3.jpg
Tek 555 1050 4.jpg
Tek 555 1050 4.jpg
Tek 555 side on cart.jpg
Tek 555 with camera.jpg
Tek 555 1050 5.jpg
Tek 555 1050 5.jpg
Tek 555 1050 6.jpg
Tek 555 1050 6.jpg
Tek 555 1050 7.jpg
Tek 555 1050 7.jpg
Tek 555 1050 8.jpg
Tek 555 1050 8.jpg
Tek 555 technikum29.de.jpg|555 photo from technikum29.de
</gallery>
'''Internals'''
<gallery>
Tek_555-LHS.jpeg    | 555 Internals, left side (upper beam)
Tek_555-RHS.jpeg    | 555 Internals, right side (lower beam)
Tek_555_Top.jpg    | 555 Top with with HV Cover off
Tek-555-Bottom.jpeg | 555 Bottom
Tek_555_V-Amp.jpg  | Vertical Amplifier (Lower Beam)
555_top_int.jpg    | top view
555_left_int.jpg    | left side view
555_rt_int.jpg      | right side view
Tek 555 1050 10.jpg
Tek 555 1050 9.jpg
Tek 555 1050 9.jpg
Tek 555 1050 10.jpg
</gallery>
 
 
'''CRT'''
<gallery>
Tek 555 crt1.jpg|CRT
Tek 555 crt2.jpg|CRT
Tek 555 crt3.jpg|CRT
Tek 555 crt4.jpg|CRT
Tek 555 crt5.jpg|CRT
Tek 555 crt6.jpg|CRT
</gallery>
 
'''Power Supply'''
<gallery>
Tek-555-PS-Front.jpg | 555 Power Supply - Front
Tek-555-PS-Rear.jpg | 555 Power Supply - Rear
555_ps.jpg          | External power supply
Tek-555-PS-Top.jpg | 555 Power Supply Internals - Top
Tek-555-PS-Bottom.jpg | 555 Power Supply Internals - Bottom
Tek 555 ps no tubes2.jpg|555 power supply
Tek 555 ps bottom.png|555 Power supply
Tek 555 ps no tubes1.png|555 Power supply
Tek 555 ps no tubes3.png|555 Power supply
Tek 555 ps no tubes4.png|555 Power supply
Tek 555 1050 11.jpg
Tek 555 1050 11.jpg
Tek 555 1050 12.jpg
Tek 555 1050 12.jpg
Tek 555 technikum29.de.jpg|555 photo from technikum29.de
 
Tek 555 ps bottom.png|555 power supply
</gallery>
Tek 555 ps no tubes1.png|555 power supply
'''Accessories'''
Tek 555 ps no tubes2.jpg|555 power supply
<gallery>
Tek 555 ps no tubes3.png|555 power supply
Tek 013-013.JPG|Timebase plug-in extender, part number [[013-0013-00]]
Tek 555 ps no tubes4.png|555 power supply
Tek 555 cable 3.jpg|Power interconnect, part number 012-0032
Tek 555 rear on cart.jpg
Tek 555 cable 2.jpg|Power interconnect, part number 012-0032
Tek 555 side on cart.jpg
Tek 555 cable 1.jpg|Power interconnect, part number 012-0032
Tek 555 with camera.jpg
 
</gallery>
'''Schematics'''
<gallery>
Tek 555 block.png|555 block diagram
555 lower vert.png|lower beam vertical amplifier
Tek 555 21 trigger.png|Type 21 trigger
Tek_555_block.png|block diagram
Tek 555 crt circuit.png|CRT circuit
Tek 555 lvreg.png|heater regulator
Tek 555 timebase interconnect3.png|time base interconnect
Tek 555 power interconnect.png|power interconnect
</gallery>
</gallery>
{{Parts|555}}




[[Category:500 series scopes]]
[[Category:500 series scopes]]
[[Category:Dual beam scopes]]
[[Category:Dual beam scopes]]
[[Category:Specifications needed]]
Retrieved from "https://w140.com/tekwiki/wiki/Special:MobileDiff/52950...77846"

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