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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-wTrace.jpeg |
|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=
* [http://w140.com/tek_555_additional_trigger_source_mod.pdf Modification for Additional Trigger Sources]
|manuals=
* [[Media:040-0328-01.pdf|Modification for Additional Trigger Sources (PDF, OCR, bad-OCR)]]
* [[Media:070-165.pdf           | 555/21A/22A Manual 070-165]]
* [http://w140.com/tek_555_operators_handbook.pdf 555 Operator's Handbook (PDF)]
* [[Media:070-403.pdf           | 555/21A/22A Manual 070-403]]
* [[Media:070-227.pdf|555 Operator's Handbook (PDF, OCR, bad-OCR)]]
 
* [http://w140.com/Tektronix_555_dt._Kurzanleitung.pdf German Introduction the 555 (PDF, OCR)]
* [[Media:070-227.pdf           | 555 Operator's Handbook]] (bad-OCR)
* [[Media:tek_555_crt_specs.pdf|555 CRT Specs (PDF, OCR)]]
* [[Media:Tektronix 21a-22a.pdf | 21A and 22A section of 555 manual]]
* [[Media:tek_555_fcp.pdf|555 Factory Calibration Procedure (PDF, OCR)]]
 
* [[Media:tek_type_21_22_fcp.pdf|Type 21 and 22 Factory Calibration Procedure (PDF, OCR)]]
<small>
* [[Media:Tektronix 21a-22a.pdf|21A and 22A section of 555 manual (PDF)]]
'''Alternate copies'''
* [[Media:tek_555_section_21a_22a.pdf|21A and 22A section of 555 manual (PDF, OCR, bad-OCR)]]
* [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)
 
'''Calibration'''
* [[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]]
 
'''Specifications'''
* [[Media:tek_555_crt_specs.pdf | 555 CRT Specs]] (OCR)
 
'''Other'''
* [[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]]
* [https://w140.com/Tektronix_555_dt._Kurzanleitung.pdf German Introduction the 555] (OCR)
</small>
}}
}}
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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{{BeginSpecs}}
{{BeginSpecs}}
{{Spec | Bandwidth | DC to 30 MHz, 3 dB down at 30 MHz ±0.5 dB (with [[K|Type K plug-in]]) }}
{{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 | Rise time | 120 ns}}
{{Spec | External Horizontal Input | 0.2 V/cm to 20 V/cm, DC to 240 kHz }}
{{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 | Sweep Rates | 100 ns/div to 5 s/div (Type 21 and 22)}}
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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.
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=== 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 in the [[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 located between the vertical output amplifier and the CRT vertical deflection plates for each channel.   
An L-C [[delay line]] is located between the vertical output amplifier and the CRT vertical deflection plates for each channel.   


Twelve 6DK6 tubes per beam are used in the main amplifier.  A pair of [[6DK6]]s are used  
Twelve 6DK6 tubes per beam are used in the main amplifier.   
to pick up the trigger signal from the differential drive, and pass it to the horizontal  
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.
plug-in via a cathode follower as a single-ended trigger signal.


Another pair of [[6DJ8]]s are used as grid-line driver cathode followers, fed by the [[12BY7]]  
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.
input driver stage, which takes the differential input from the vertical plug-in.
A pair of triodes out of [[6DJ8]]s are used as amplifier to drive beam position indicator neons near the CRT.
A pair of triodes out of [[6DJ8]]s are used as amplifier to drive beam position indicator neons near the CRT.


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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://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]
* https://web.archive.org/web/20221204145636/http://www.barrytech.com/tektronix/vintage/tek555.html Tektronix 555 @ barrytech.com (waybackarchive) ]
* [http://www.radiomuseum.org/r/tektronix_dual_beam_oscilloscope_55_2.html Tektronix 555 @ radiomuseum.org]
* [http://www.radiomuseum.org/r/tektronix_dual_beam_oscilloscope_55_2.html Tektronix 555 @ radiomuseum.org ]
* [http://www.lemis.com/grog/Albums/Tektronix-555.php Greg's 555] - lots of photos
* [http://www.lemis.com/grog/Albums/Tektronix-555.php Greg's 555] - lots of photos
* [https://www.youtube.com/watch?v=RjuMm4pQyBI Tektronix 555 Troubleshooting] Zenwizard @ YouTube


==Pictures==
==Pictures==
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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-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_left_int.jpg    | left side view
555 P11.JPG               | 555 with P11 [[phosphor]] option
Tek_555-LHS.jpeg    | 555 Internals, left side (upper beam)
555_P7.jpg               | 555 with P7 [[phosphor]] option (fast blue / slow green)
555_rt_int.jpg      | right side view
Tek 555 1050 1.jpg
Tek_555-RHS.jpeg    | 555 Internals, right side (lower beam)
Tek 555 1050 2.jpg
555_top_int.jpg    | top view
Wellenkino 555-2.jpg  
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 [[phosphor]] option
555_P7.jpg         | 555 with P7 [[phosphor]] option (fast blue / slow green)
 
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 rear on cart.jpg
Tek 555 rear on cart.jpg
Tek 555 1050 3.jpg
Tek 555 1050 4.jpg
Tek 555 side on cart.jpg
Tek 555 side on cart.jpg
Tek 555 with camera.jpg
Tek 555 with camera.jpg
Tek 555 1050 1.jpg
Tek 555 1050 2.jpg
Tek 555 1050 3.jpg
Tek 555 1050 4.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
Tek 555 rear2.jpeg
Tek 555 power connector.jpeg
</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
Tek 555 1050 11.jpg
Tek 555 1050 12.jpg
Tek 555 technikum29.de.jpg|555 photo from technikum29.de
</gallery>
</gallery>


'''CRT'''
'''CRT'''
<gallery>
<gallery>
Tek 555 crt1.jpg|CRT
Tek 555 crt1.jpg | CRT
Tek 555 crt2.jpg|CRT
Tek 555 crt2.jpg | CRT
Tek 555 crt3.jpg|CRT
Tek 555 crt3.jpg | CRT
Tek 555 crt4.jpg|CRT
Tek 555 crt4.jpg | CRT
Tek 555 crt5.jpg|CRT
Tek 555 crt5.jpg | CRT
Tek 555 crt6.jpg|CRT
Tek 555 crt6.jpg | CRT
</gallery>
</gallery>


'''Power Supply'''
'''Power Supply'''
<gallery>
<gallery>
555_ps.jpg          | external power supply
Tek-555-PS-Front.jpg     | 555 Power Supply - Front
Tek 555 ps no tubes2.jpg|555 power supply
Tek-555-PS-Rear.jpg     | 555 Power Supply - Rear
Tek 555 ps bottom.png|555 power supply
555_ps.jpg              | External power supply
Tek 555 ps no tubes1.png|555 power supply
Tek-555-PS-Top.jpg       | 555 Power Supply Internals - Top
Tek 555 ps no tubes3.png|555 power supply
Tek-555-PS-Bottom.jpg   | 555 Power Supply Internals - Bottom
Tek 555 ps no tubes4.png|555 power supply
Tek 555 ps no tubes2.jpg | 555 power supply
Tek-555-PS-Front.jpg | 555 Power Supply - Front
Tek 555 ps bottom.png    | 555 Power supply
Tek-555-PS-Rear.jpg | 555 Power Supply - Rear
Tek 555 ps no tubes1.png | 555 Power supply
Tek-555-PS-Top.jpg | 555 Power Supply Internals - Top
Tek 555 ps no tubes3.png | 555 Power supply
Tek-555-PS-Bottom.jpg | 555 Power Supply Internals - Bottom
Tek 555 ps no tubes4.png | 555 Power supply
Tek 555 cable 3.jpg|Power interconnect, part number 012-032
Tek 555 1050 11.jpg
Tek 555 cable 2.jpg|Power interconnect, part number 012-032
Tek 555 1050 12.jpg
Tek 555 cable 1.jpg|Power interconnect, part number 012-032
 
</gallery>
</gallery>
'''Accessories'''
<gallery>
Tek 013-013.JPG    | Timebase plug-in extender, part number [[013-0013-00]]
Tek 555 cable 3.jpg | Power interconnect, part number 012-0032-00
Tek 555 cable 2.jpg | Power interconnect, part number 012-0032-00
Tek 555 cable 1.jpg | Power interconnect, part number 012-0032-00


</gallery>
'''Schematics'''
'''Schematics'''
<gallery>
<gallery>
Tek 555 block.png|555 block diagram
Tek 555 block.png                 | 555 block diagram
555 lower vert.png|lower beam vertical amplifier
555 lower vert.png                 | lower beam vertical amplifier
Tek 555 21 trigger.png|Type 21 trigger
Tek 555 21 trigger.png             | Type 21 trigger
Tek_555_block.png|block diagram
Tek_555_block.png                 | block diagram
Tek 555 crt circuit.png|CRT circuit
Tek 555 crt circuit.png           | CRT circuit
Tek 555 lvreg.png|heater regulator
Tek 555 lvreg.png                 | heater regulator
Tek 555 timebase interconnect3.png|time base interconnect
Tek 555 timebase interconnect3.png | time base interconnect
Tek 555 power interconnect.png|power interconnect
Tek 555 power interconnect.png     | power interconnect
</gallery>
</gallery>
==Components==
{{Parts|555}}




[[Category:500 series scopes]]
[[Category:500 series scopes]]
[[Category:Dual beam scopes]]
[[Category:Dual beam scopes]]
Matt
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