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* [http://w140.com/mmm/tek-555.pdf 555 manual hosted locally]
* [http://w140.com/mmm/tek-555.pdf 555 manual hosted locally]
* [http://bama.edebris.com/manuals/tek/555 555 manual on BAMA (offline?)]
* [http://bama.edebris.com/manuals/tek/555 555 manual on BAMA (offline?)]
* [http://w140.com/tek_555_additional_trigger_source_mod.pdf Modification for Additional Trigger Sources]
* [http://w140.com/tek_555_additional_trigger_source_mod.pdf Modification for Additional Trigger Sources]
* [[Media:040-0328-01.pdf|Modification for Additional Trigger Sources (PDF, OCR, bad-OCR)]]
* [[Media:040-0328-01.pdf|Modification for Additional Trigger Sources (PDF, OCR, bad-OCR)]]
* [http://w140.com/tek_555_operators_handbook.pdf 555 Operator's Handbook (PDF)]
* [http://w140.com/tek_555_operators_handbook.pdf 555 Operator's Handbook (PDF)]
* [[Media:070-227.pdf|555 Operator's Handbook (PDF, OCR, bad-OCR)]]
* [[Media:070-227.pdf|555 Operator's Handbook (PDF, OCR, bad-OCR)]]
<!-- * [[Media:tek_555_german_intro.pdf|German Introduction the 555 (PDF, OCR)]] -->
* [http://w140.com/Tektronix_555_dt._Kurzanleitung.pdf German Introduction the 555 (PDF, OCR)]
* [http://w140.com/Tektronix_555_dt._Kurzanleitung.pdf German Introduction the 555 (PDF, OCR)]
* [[Media:tek_555_crt_specs.pdf|555 CRT Specs (PDF, OCR)]]
* [[Media:tek_555_crt_specs.pdf|555 CRT Specs (PDF, OCR)]]
<!-- * [http://w140.com/tek_555_crt.pdf 555 CRT Specs (PDF)] -->
* [[Media:tek_555_fcp.pdf|555 Factory Calibration Procedure (PDF, OCR)]]
* [[Media:tek_555_fcp.pdf|555 Factory Calibration Procedure (PDF, OCR)]]
<!-- * [http://w140.com/tek_fcp/tek_555_fac_cal.pdf 555 Factory Calibration Procedure (PDF)] -->
* [[Media:tek_type_21_22_fcp.pdf|Type 21 and 22 Factory Calibration Procedure (PDF, OCR)]]
* [[Media:tek_type_21_22_fcp.pdf|Type 21 and 22 Factory Calibration Procedure (PDF, OCR)]]
<!-- * [http://w140.com/tek_fcp/tek_type_21_and_22_factory_cal_proc.pdf Type 21 and 22 Factory Calibration Procedure (PDF)] -->
* [[Media:Tektronix 21a-22a.pdf|21A and 22A section of 555 manual (PDF)]]
* [[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)]]
* [[Media:tek_555_section_21a_22a.pdf|21A and 22A section of 555 manual (PDF, OCR, bad-OCR)]]
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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 ==
{{MissingSpecs}}
 
==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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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.  It is the same as the vertical output amplifier inthe [[551]] and the [[545|545A]].   
made of [[6DK6]] tubes.  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.   


12 x6DK6 tubes are used as main amplifier per beam, 6 each for the push and pull section.
Twelve 6DK6 tubes per beam are used in the main amplifier. A pair of [[6DK6]]s are used  
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.
to pick up the trigger signal from the differential drive, and pass it to the horizontal
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.
plug-in via a cathode follower as a single-ended trigger signal.
A pair of triodes out of [[6DJ8]]s are used as amplifier to drive beam position indicator neons near CRT.
 
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 triodes out of [[6DJ8]]s are used as amplifier to drive beam position indicator neons near the 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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<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-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_left_int.jpg   | left side view
555_left_int.jpg|left side view
Tek_555-LHS.jpeg   | 555 Internals, left side (upper beam)
Tek_555-LHS.jpeg | 555 Internals LHS (Upper Beam)
555_rt_int.jpg     | right side view
555_rt_int.jpg|right side view
Tek_555-RHS.jpeg   | 555 Internals, right side (lower beam)
Tek_555-RHS.jpeg | 555 Internals RHS (Lower Beam)
555_top_int.jpg     | top view
555_top_int.jpg|top view
Tek_555_Top.jpg     | 555 Top with with HV Cover off
Tek_555_Top.jpg | 555 Top with with HV Cover off
Tek-555-Bottom.jpeg | 555 Bottom  
Tek-555-Bottom.jpeg | 555 Bottom  
Tek_555_V-Amp.jpg | Vertical Amplifier (Lower Beam)
Tek_555_V-Amp.jpg   | Vertical Amplifier (Lower Beam)
555 P11.JPG|555 with P11-option
555 P11.JPG         | 555 with P11 [[phosphor]] option
555_P7.jpg|555 with P7-option (fast blue and slow green Phosphor)
555_P7.jpg         | 555 with P7 [[phosphor]] option (fast blue / slow green)
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
Tek 013-013.JPG|timebase plug-in extender, part number 013-013
Wellenkino 555-2.jpg
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 side on cart.jpg
Tek 555 with camera.jpg
Tek 555 1050 1.jpg
Tek 555 1050 1.jpg
Tek 555 1050 2.jpg
Tek 555 1050 2.jpg
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Tek 555 1050 12.jpg
Tek 555 1050 12.jpg
Tek 555 technikum29.de.jpg|555 photo from technikum29.de
Tek 555 technikum29.de.jpg|555 photo from technikum29.de
</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>
555_ps.jpg          | external power supply
Tek 555 ps no tubes2.jpg|555 power supply
Tek 555 ps bottom.png|555 power supply
Tek 555 ps bottom.png|555 power supply
Tek 555 ps no tubes1.png|555 power supply
Tek 555 ps no tubes1.png|555 power supply
Tek 555 ps no tubes2.jpg|555 power supply
Tek 555 ps no tubes3.png|555 power supply
Tek 555 ps no tubes3.png|555 power supply
Tek 555 ps no tubes4.png|555 power supply
Tek 555 ps no tubes4.png|555 power supply
Tek 555 rear on cart.jpg
Tek-555-PS-Front.jpg | 555 Power Supply - Front
Tek 555 side on cart.jpg
Tek-555-PS-Rear.jpg | 555 Power Supply - Rear
Tek 555 with camera.jpg
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
</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>


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