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The Tektronix Type 555 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
[[introduced_in_1959|1959]] and made until the late 1960's, when it was replacedby the [[556]].  
by the [[556]].  
 
The system is split across two pieces: the main indicator unit  
The system is split across two cabinets, the main indicator unit and the external power supply unit.   
and the external power supply unit.   
The power supply unit contains the main transformer, rectifiers and regulators for all of the voltages except the filament and CRT HV supplies.   
The power supply unit contains the main transformer,  
rectifiers and regulators for all of the voltages  
except the filament and CRT HV supplies.   
The filament and CRT HV voltages are generated in the 555 indicator unit.   
The filament and CRT HV voltages are generated in the 555 indicator unit.   


The Tektronix 555 takes two
The Tektronix 555 takes two[[letter-series and 1-series plug-ins|letter-series or 1-series vertical plug-ins]]
[[letter-series and 1-series plug-ins|letter-series or 1-series vertical plug-ins]]


== Type 21 and 22 Timebases ==
== Type 21 and 22 Timebases ==
The 555 uses special horizontal plug-ins  
The 555 uses special horizontal plug-ins that contain the trigger and sweep.   
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  
A rigid plug-in extension for the timebases (part number [[013-013]]) was included with every 555.
the 21 and 22 horizontal plug-ins.  
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  
Later instances came with the 21A and 22A horizontal plug-ins, which use [[tunnel diodes]] for triggering.   
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  
Since the 555 is a dual-beam scope, it is also possible to start one of the sweeps while the other beam is sweeping.   
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.   


== Filament Supply Regulator ==
== Filament Supply Regulator ==
Regulation of the filament supply happens as follows:   
Regulation of the filament supply happens as follows:   
There is a feedback loop that is formed between the indicator
There is a feedback loop that is formed between the indicator unit and the power supply unit.  The power supply sends AC  
unit and the power supply unit.  The power supply sends AC  
through the interconnection cable to the indicator unit, where it is connected to the primary of the filament transformer.   
through the interconnection cable to the indicator unit,
A sample of the output of the filament transformer is sent back through the interconnection cable (part number 012-032)
where it is connected to the primary of the filament transformer.   
A sample of the output of the filament transformer is sent  
back through the interconnection cable (part number 012-032)
from the indicator unit to the power supply unit.   
from the indicator unit to the power supply unit.   
This performs two functions.   
This performs two functions.   
First, the filament voltage that is sent back to the power supply unit  
First, the filament voltage that is sent back to the power supply unit is used to heat the cathodes of tubes in the power supply unit.   
is used to heat the cathodes of tubes in the power supply unit.   
Second, this filament voltage is the feedback signal to a regulator in the power supply unit that controls how much voltage is sent  
Second, this filament voltage is the feedback signal to a regulator
to the filament transformer.  One of the consequences of this scheme is that it is impossible to energize the power supply unit without  
in the power supply unit that controls how much voltage is sent  
the indicator unit connected.  The regulator tubes in the power supply would remain cold without filament power, and would not pass any current.   
to the filament transformer.  One of the consequences of this scheme  
is that it is impossible to energize the power supply unit without  
the indicator unit connected.  The regulator tubes in the power supply  
would remain cold without filament power, and would not pass any current.   


== Vertical Amplifier ==
== Vertical Amplifier ==
The Tektronix 555 has a six-section differential  
The Tektronix 555 has a six-section differential [[distributed amplifier|distributed vertical output amplifier]]
[[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
An L-C [[delay line]] is between the vertical output amplifier and the CRT vertical deflection plates
the [[551]] and the [[545|545A]].  An L-C [[delay line]] is between  
the vertical output amplifier and the CRT vertical deflection plates
for each channel.   
for each channel.   


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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.
The lower beam HV power supply is based on transformer T901 and produces:
The lower beam HV power supply is based on transformer T901 and produces:
* CRT anode voltage: +8650V
* CRT anode voltage: +8,650 V
* lower beam CRT cathode voltage: -1350V
* lower beam CRT cathode voltage: -1,350 V
* lower beam CRT control grid (blanking) voltage: floating, -1500V
* lower beam CRT control grid (blanking) voltage: floating, -1,500 V


The upper beam HV power supply is based on T801 and produces:
The upper beam HV power supply is based on T801 and produces:
* upper beam CRT cathode voltage: -1350V
* upper beam CRT cathode voltage: -1,350 V
* upper beam CRT control grid (blanking) voltage: floating, -1500V
* upper beam CRT control grid (blanking) voltage: floating, -1,500 V


Rectification is performed by a total of six [[5642]] rectifier tubes.
Rectification is performed by a total of six [[5642]] rectifier tubes.
Each of the two HV power supplies is independently regulated using
Each of the two HV power supplies is independently regulated using a two-stage common-cathode amplifier based on a [[12AU7]] dual triode.
a two-stage common-cathode amplifier based on a [[12AU7]] dual triode.
The oscillator tube is a [[6CZ5]] power pentode.
The oscillator tube is a [[6CZ5]] power pentode.


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==Links==
==Links==
* [https://www.youtube.com/watch?v=BvbNBZX6kNE 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.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


==Pictures==
==Pictures==


<gallery>
<gallery>
Image:Tek 555 front fl2.jpg
Tek 555 front fl2.jpg
Image: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
Image:555_ps.jpg|external power supply
555_ps.jpg|external power supply
Image:555_left_int.jpg|left side view
555_left_int.jpg|left side view
Image:555_rt_int.jpg|right side view
555_rt_int.jpg|right side view
Image:555_top_int.jpg|top view
555_top_int.jpg|top view
Image:555 P11.JPG|555 with P11-option
555 P11.JPG|555 with P11-option
Image:555_P7.jpg|555 with P7-option (fast blue and slow green Phosphor)
555_P7.jpg|555 with P7-option (fast blue and slow green Phosphor)
Image:Tek 555 cable 3.jpg|Power interconnect, part number 012-032
Tek 555 cable 3.jpg|Power interconnect, part number 012-032
Image:Tek 555 cable 2.jpg|Power interconnect, part number 012-032
Tek 555 cable 2.jpg|Power interconnect, part number 012-032
Image:Tek 555 cable 1.jpg|Power interconnect, part number 012-032
Tek 555 cable 1.jpg|Power interconnect, part number 012-032
Image:Tek 555 timebase interconnect3.png|timebase interconnect
Tek 555 timebase interconnect3.png|timebase interconnect
Image:Tek 555 block.png|555 block diagram
Tek 555 block.png|555 block diagram
Image:555 lower vert.png|lower beam vertical amplifier
555 lower vert.png|lower beam vertical amplifier
Image:Tek 555 power interconnect.png|power interconnect
Tek 555 power interconnect.png|power interconnect
Image:Tek 555 lvreg.png|heater regulator
Tek 555 lvreg.png|heater regulator
Image:Tek 555 21 trigger.png|Type 21 trigger
Tek 555 21 trigger.png|Type 21 trigger
Image:Tek_555_block.png|block diagram
Tek_555_block.png|block diagram
File:Tek 555 crt circuit.png|CRT circuit
Tek 555 crt circuit.png|CRT circuit
File:Tek 555 crt1.jpg|CRT
Tek 555 crt1.jpg|CRT
File:Tek 555 crt2.jpg|CRT
Tek 555 crt2.jpg|CRT
File:Tek 555 crt3.jpg|CRT
Tek 555 crt3.jpg|CRT
File:Tek 555 crt4.jpg|CRT
Tek 555 crt4.jpg|CRT
File:Tek 555 crt5.jpg|CRT
Tek 555 crt5.jpg|CRT
File:Tek 555 crt6.jpg|CRT
Tek 555 crt6.jpg|CRT
File:Tek 22a front.jpg|22A front
Tek 22a front.jpg|22A front
File:Tek 22a trigger board.jpg|22A  TD trigger board
Tek 22a trigger board.jpg|22A  TD trigger board
File:Tek 22a top.jpg| 22A top
Tek 22a top.jpg| 22A top
File:Tek 22a bottom.jpg| 22A bottom
Tek 22a bottom.jpg| 22A bottom
File:Tek 21 front.jpg| 21 front
Tek 21 front.jpg| 21 front
File:Tek 21 top.jpg| 21 top
Tek 21 top.jpg| 21 top
File:Tek 21 bottom.jpg| 21 bottom
Tek 21 bottom.jpg| 21 bottom
File:Tek 22 front.jpg| 22 front
Tek 22 front.jpg| 22 front
File:Tek 22 top.jpg| 22 top
Tek 22 top.jpg| 22 top
File:Tek 22 bottom2.jpg| 22 bottom
Tek 22 bottom2.jpg| 22 bottom
File:Tek 21a front.jpg| 21A front
Tek 21a front.jpg| 21A front
File:Tek 21a top.jpg| 21A top
Tek 21a top.jpg| 21A top
File:Tek 21a bottom.jpg| 21 bottom
Tek 21a bottom.jpg| 21 bottom
File:Tek 21a trigger board.jpg| 21A TD trigger board
Tek 21a trigger board.jpg| 21A TD trigger board
File:Tek 013-013.JPG|timebase plug-in extender, part number 013-013
Tek 013-013.JPG|timebase plug-in extender, part number 013-013
File:Wellenkino 555-2.jpg
Wellenkino 555-2.jpg
File:Wellenkino 555.jpg
Wellenkino 555.jpg
</gallery>
</gallery>


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