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The 555 is a [[dual-beam scopes|dual-beam CRT oscilloscope]] introduced by Tektronix in  
{{Oscilloscope Sidebar
[[introduced_in_1959|1959]] and made until the late 1960's, when it was replaced
|manufacturer=Tektronix
by the [[556]].  
|series=500-series scopes
The system is split across two pieces: the main indicator unit  
|model=555
and the external power supply unit.   
|summary=Dual beam 30 MHz scope
The power supply unit contains the main transformer,  
|image=Tek_555-wTrace.jpeg
rectifiers and regulators for all of the voltages  
|caption=Tektronix 555 Front
except the filament and CRT HV supplies.   
|introduced=1959
|discontinued=1970
|designers=
|manuals=
* [[Media:070-165.pdf          | 555/21A/22A Manual 070-165]]
* [[Media:070-403.pdf          | 555/21A/22A Manual 070-403]]
 
* [[Media:070-227.pdf          | 555 Operator's Handbook]] (bad-OCR)
* [[Media:Tektronix 21a-22a.pdf | 21A and 22A section of 555 manual]]
 
<small>
'''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)
 
'''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  
[[introduced_in_1959|1959]] and made until the late 1960's, when it was replaced by the [[556]].  
 
The system is split across two cabinets, the main indicator 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 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 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]]


{{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  
Early instances of the 555 came with the [[21 (plug-in)|Type 21]] and [[22|Type 22]] horizontal plug-ins.  
the 21 and 22 horizontal plug-ins.
 
Later instances came with  
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.
the 21A and 22A horizontal plug-ins,  
 
which use [[tunnel diodes]] for triggering.   
A rigid plug-in extension for the timebases (part number [[013-013]]) was included with every 555.
 
=== Type 21A and 22A Timebases ===
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.   


Regulation of the filament supply happens as follows: 
=== Power Supply and Filament Supply Regulator ===
There is a feedback loop that is formed between the indicator
The external power supply unit generates all the B+ Voltages (–150, +100, +225, +330, +350 and +500 V) required by the indicator unit.
unit and the power supply unit. The power supply sends AC  
These are fed to the indicator unit through the interconnect cable.
through the interconnection cable to the indicator unit,
 
where it is connected to the primary of the filament transformer.
There are two transformers inside the power supply unit – one to generate heater voltages (except for the tubes noted below), the other to generate all the B+ plate voltages.  
A sample of the output of the filament transformer is sent
 
back through the interconnection cable from the indicator unit  
The heater/filament supply for all the tubes inside the indicator unit are generated by a transformer inside the indicator unit.
to the power supply unit. This performs two functions.
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.
First, the filament voltage that is sent back to the power supply unit  
One 6.3 V winding from the indicator unit filament transformer is fed back through the interconnection cable (part number [[012-032]])
is used to heat the cathodes of tubes in the power supply unit.   
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)
Second, this filament voltage is the feedback signal to a regulator
is used to sense this filament voltage and derive a control DC current through the saturable inductor, thereby closing the control loop.
in the power supply unit that controls how much voltage is sent
 
to the filament transformer. One of the consequences of this scheme
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
is that it is impossible to energize the power supply unit without
* 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 indicator unit connected.  The regulator tubes in the power supply  
* 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.
would remain cold without filament power, and would not pass any current. 
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 ===
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 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. 
 
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.
 
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]].
 
=== CRT Circuit ===
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.
The lower beam HV power supply is based on transformer T901 and produces:
* CRT anode voltage: +8,650 V
* lower beam CRT cathode voltage: -1,350 V
* lower beam CRT control grid (blanking) voltage: floating, -1,500 V
 
The upper beam HV power supply is based on T801 and produces:
* upper beam CRT cathode voltage: -1,350 V
* upper beam CRT control grid (blanking) voltage: floating, -1,500 V


The 555 has a six-section differential
Rectification and voltage multiplication is performed by a total of six [[5642]] rectifier tubes.
[[distributed amplifier|distributed vertical output amplifier]]
Each of the two HV power supplies is independently regulated using a two-stage common-cathode amplifier based on a [[12AU7]] dual triode.
made of [[6DK6]] tubes.  It is the same as the vertical output amplifier in
The oscillator tube is a [[6CZ5]] power pentode.
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.


Architecturally, the 555, with its four plug-ins, is similar
The 555 uses the [[T5550]] CRT.
to the [[7844]].  


* [http://bama.edebris.com/manuals/tek/555 555 manual on BAMA]
==Links==
* [http://w140.com/tek_555_crt.pdf 555 CRT Specs (PDF)]
* [https://lazyelectrons.wordpress.com/2019/11/10/tektronix-555-restore/ Tektronix 555 Restore/Repair with Videos at Lazy Electrons Blog ]
* [http://w140.com/tek_fcp/tek_555_fac_cal.pdf 555 Factory Calibration Guide (PDF)]
* [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
* [https://www.youtube.com/watch?v=RjuMm4pQyBI Tektronix 555 Troubleshooting] Zenwizard @ YouTube
 
==Pictures==
 
<gallery>
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-CA.jpg            | Tek 555 with CA Dual Trace Plug-ins
Tek_555-Delayed-Trace.jpg | Tek 555 in Delayed Trigger Mode
555 P11.JPG              | 555 with P11 [[phosphor]] option
555_P7.jpg                | 555 with P7 [[phosphor]] option (fast blue / slow green)
Tek 555 1050 1.jpg
Tek 555 1050 2.jpg
Wellenkino 555-2.jpg
Wellenkino 555.jpg
Tek 555 rear.jpg          | 555 rear
Tek 555 rear on cart.jpg
Tek 555 1050 3.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 6.jpg
Tek 555 1050 7.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
</gallery>




'''CRT'''
<gallery>
<gallery>
Image:Tek 555 front fl2.jpg
Tek 555 crt1.jpg | CRT
Image:Tek 555 front fl.jpg|front view: two timing plug-ins on top and two vertical plug-ins on bottom
Tek 555 crt2.jpg | CRT
Image:555_ps.jpg|external power supply
Tek 555 crt3.jpg | CRT
Image:555_left_int.jpg|left side view
Tek 555 crt4.jpg | CRT
Image:555_rt_int.jpg|right side view
Tek 555 crt5.jpg | CRT
Image:555_top_int.jpg|top view
Tek 555 crt6.jpg | CRT
Image:555 P11.JPG|555 with P11-option
Image:Tek 555 cable 3.jpg|Power interconnect
Image:Tek 555 cable 2.jpg|Power interconnect
Image:Tek 555 cable 1.jpg|Power interconnect
Image:Tek 555 timebase interconnect3.png|timebase interconnect
Image:Tek 555 block.png|555 block diagram
Image:555 lower vert.png|lower beam vertical amplifier
Image:Tek 555 power interconnect.png|power interconnect
Image:Tek 555 lvreg.png|heater regulator
Image:Tek 555 21 trigger.png|Type 21 trigger
Image:Tek_555_block.png|block diagram
File:Tek 555 crt1.jpg|CRT
File:Tek 555 crt2.jpg|CRT
File:Tek 555 crt3.jpg|CRT
File:Tek 555 crt4.jpg|CRT
File:Tek 555 crt5.jpg|CRT
File:Tek 555 crt6.jpg|CRT
</gallery>
</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 12.jpg
</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'''
<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>
==Components==
{{Parts|555}}
[[Category:500 series scopes]]
[[Category:Dual beam scopes]]

Latest revision as of 12:32, 18 July 2024

Tektronix 555
Dual beam 30 MHz scope
Tektronix 555 Front

Produced from 1959 to 1970

Manuals
Manuals – Specifications – Links – Pictures

The Tektronix Type 555, nicknamed "Triple Nickel", is a dual-beam CRT oscilloscope introduced by Tektronix in 1959 and made until the late 1960's, when it was replaced by the 556.

The system is split across two cabinets, the main indicator 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 filament and CRT HV voltages are generated in the 555 indicator unit.

The Tektronix 555 takes two letter-series or 1-series vertical plug-ins

Key Specifications

Bandwidth DC to 30 MHz, 3 dB down at 30 MHz ±0.5 dB (with Type K plug-in)
Rise time 120 ns
External Horizontal Input 0.2 V/cm to 20 V/cm, DC to 240 kHz
Sweep Rates 100 ns/div to 5 s/div (Type 21 and 22)
External Trigger Level 0.2 V to 10 V
Calibrator ~1 kHz, 200 μVp-p to 100 Vp-p
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
Line Voltage 105 to 125 V or 210 to 250 V, 50/60 Hz
Power Consumption 1050 W
Dimensions Indicator Unit, 24"×13"×20"; Power Supply Unit, 17.5"×13"×10" (LWH)
Weight Indicator Unit, 68 lb; Power Supply, 45 lb
Cooling AC Fan for both Power Supply and Indicator Unit

Internals

Type 21 and 22 Timebases

The 555 uses special horizontal plug-ins that contain the trigger and sweep. Early instances of the 555 came with the Type 21 and 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.

A rigid plug-in extension for the timebases (part number 013-013) was included with every 555.

Type 21A and 22A Timebases

Later instances came with the 21A and 22A horizontal plug-ins, which use tunnel diodes for triggering. 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. The upper-beam sweep and lower-beam sweeps are, in fact, totally independent.

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. These are fed to the indicator unit through the interconnect cable.

There are two transformers inside the power supply unit – one to generate heater voltages (except for the tubes noted below), the other to generate all the B+ plate voltages.

The heater/filament supply for all the tubes inside the indicator unit are generated by a transformer inside the indicator unit. 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) 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) is used to sense this filament voltage and derive a control DC current through the saturable inductor, thereby 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) 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 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.

Vertical Amplifier

The Tektronix 555 has a six-section differential distributed vertical output amplifier made of 6DK6 tubes. It is the same as the vertical output amplifier in the 551 and the 545A. 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 6DK6s 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.

Another pair of 6DJ8s 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 6DJ8s 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.

CRT Circuit

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. The lower beam HV power supply is based on transformer T901 and produces:

  • CRT anode voltage: +8,650 V
  • lower beam CRT cathode voltage: -1,350 V
  • lower beam CRT control grid (blanking) voltage: floating, -1,500 V

The upper beam HV power supply is based on T801 and produces:

  • upper beam CRT cathode voltage: -1,350 V
  • upper beam CRT control grid (blanking) voltage: floating, -1,500 V

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

The 555 uses the T5550 CRT.

Links

Pictures

  • front view: two timing plug-ins on top and two vertical plug-ins on bottom

    front view: two timing plug-ins on top and two vertical plug-ins on bottom

  • Tek 555 with CA Dual Trace Plug-ins

    Tek 555 with CA Dual Trace Plug-ins

  • Tek 555 in Delayed Trigger Mode

    Tek 555 in Delayed Trigger Mode

  • 555 with P11 phosphor option

    555 with P11 phosphor option

  • 555 with P7 phosphor option (fast blue / slow green)

    555 with P7 phosphor option (fast blue / slow green)

  • 555 rear

    555 rear

  • 555 photo from technikum29.de

    555 photo from technikum29.de

Internals

  • 555 Internals, left side (upper beam)

    555 Internals, left side (upper beam)

  • 555 Internals, right side (lower beam)

    555 Internals, right side (lower beam)

  • 555 Top with with HV Cover off

    555 Top with with HV Cover off

  • 555 Bottom

    555 Bottom

  • Vertical Amplifier (Lower Beam)

    Vertical Amplifier (Lower Beam)

  • top view

    top view

  • left side view

    left side view

  • right side view

    right side view


CRT

  • CRT

    CRT

  • CRT

    CRT

  • CRT

    CRT

  • CRT

    CRT

  • CRT

    CRT

  • CRT

    CRT

Power Supply

  • 555 Power Supply - Front

    555 Power Supply - Front

  • 555 Power Supply - Rear

    555 Power Supply - Rear

  • External power supply

    External power supply

  • 555 Power Supply Internals - Top

    555 Power Supply Internals - Top

  • 555 Power Supply Internals - Bottom

    555 Power Supply Internals - Bottom

  • 555 power supply

    555 power supply

  • 555 Power supply

    555 Power supply

  • 555 Power supply

    555 Power supply

  • 555 Power supply

    555 Power supply

  • 555 Power supply

    555 Power supply

Accessories

  • Timebase plug-in extender, part number 013-0013-00

    Timebase plug-in extender, part number 013-0013-00

  • Power interconnect, part number 012-0032-00

    Power interconnect, part number 012-0032-00

  • Power interconnect, part number 012-0032-00

    Power interconnect, part number 012-0032-00

  • Power interconnect, part number 012-0032-00

    Power interconnect, part number 012-0032-00

Schematics

  • 555 block diagram

    555 block diagram

  • lower beam vertical amplifier

    lower beam vertical amplifier

  • Type 21 trigger

    Type 21 trigger

  • block diagram

    block diagram

  • CRT circuit

    CRT circuit

  • heater regulator

    heater regulator

  • time base interconnect

    time base interconnect

  • power interconnect

    power interconnect

Components

Some Parts Used in the 555

Part Part Number(s) Class Description Used in
12AU7 154-041 • 154-0041-00 • 154-0287-00 Vacuum Tube (Dual Triode) dual medium-μ triode 104 • 104A • 122 • 160 • 161 • 162 • 181 • 190 • 310 • 310A • 316 • 317 • 3C66 • 502 • 502A • 507 • 511A • 512 • 516 • 517 • 517A • 524 • 526 • 535 • 536 • 545 • 545A • 545B • 547 • 549 • 555 • 561 • 564 • 570 • 575 • 581 • 581A • 585 • 585A • C • D • E • N • Q • Hickok 1825
12AX7 154-043 • 154-0043-00 Vacuum Tube (Dual Triode) dual triode 3C66 • 513 • 524 • 531 • 531A • 535 • 536 • 545 • 545A • 545B • 546 • 547 • 549 • 555 • 570 • 581 • 581A • 585 • 585A • E • Q • Hickok 1825 • Keithley 610
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 • Keithley 610
12BY7A 154-047 • 154-0047-00 Vacuum Tube (Pentode) miniature 6.5 W power pentode 106 • 163 • 524 • 531 • 533 • 535 • 536 • 541 • 543 • 535 • 545 • 545A • 549 • 555 • 75 • 3A75 • 3B5
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
6AU6 154-0022-00 • 157-0073-00 • 157-0059-00 • 154-0284-00 Vacuum Tube (Pentode) RF pentode 107 • 160 • 181 • 190 • 60 • 2A60 • 72 • 3A72 • 3C66 • 310 • 310A • 316 • 317 • 360 • 502 • 502A • 506 • 511 • 511A • 512 • 513 • 516 • 517 • 517A • 524 • 526 • 529 • RM529 • 531 • 531A • 535 • 536 • 545 • 545A • 546 • 547 • 549 • 555 • 561 • 561A • 561S • 564 • 565 • 567 • 570 • 575 • 581 • 581A • 585 • 585A • 80 • C • CA • Q
6CZ5 154-0167-00 Vacuum Tube (Pentode) power pentode 317 • 502 • 506 • 526 • 555 • 561 • 561A • 561S • 564 • 565 • 567
6DJ8 154-0187-00 • 154-0305-00 Vacuum Tube (Dual Triode) dual triode 067-506 • 111 • 132 • 161 • 310A • 316 • 317 • 502 • 502A • 503 • 504 • 506 • 515 • 516 • 519 • 526 • 529 • RM529 • 533 • 535 • 536 • 543 • 544 • 545 • 545A • 545B • 546 • 547 • 549 • 555 • 556 • 561A • 561S • 564 • 565 • 567 • 581 • 581A • 585 • 585A • 661 • 1A4 • 1S1 • 60 • 2A60 • 63 • 2A63 • 67 • 2B67 • 3A1 • 3A1S • 3A2 • 3A3 • 3A6 • 3A7 • 72 • 3A72 • 75 • 3A75 • 4S2 • 51 • 3B1 • 3B1S • 3B2 • 3B3 • 3B4 • 3M1 • 3S76 • 3T77 • 3T77A • 9A1 • 9A2 • 1121 • 80 • 81 • 82 • 86 • B • O • W • Z • Telequipment D56 • Telequipment S32A • Telequipment D52 • S-311 • Telequipment TD51 • Telequipment S52 • Telequipment S51 • Telequipment Type A • TU-4
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
T5550 154-0199-00 • 154-0219-00 • 154-0221-00 • 154-0476-00 • 154-0476-01 • 154-0476-02 • 154-0476-03 CRT dual-beam CRT 555
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