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{{Oscilloscope Sidebar |
{{Oscilloscope Sidebar
title=Tektronix 561 |
|manufacturer=Tektronix
image=Tek 561b cal trace.jpg |
|series=560-series scopes
summary=10(4) MHz "General Purpose Scope" |
|model=561
caption=Tektronix 561B |
|image=Tek 561b cal trace.jpg
introduced=1961 |
|summary=10(4) MHz "General Purpose Scope"
discontinued=1974 |
|caption=Tektronix 561B
manuals=
|introduced=1961
* [http://w140.com/tek_rm561.pdf Tektronix RM561 Manual (PDF)]
|discontinued=1974
* [http://w140.com/mmm/tek-561a.pdf Tektronix 561A Manual (PDF)]
|designers=Bob Shand;
* [[Media:Tek 561 fcp.pdf|Tektronix 561 Factory Calibration Procedure (PDF, needs OCR)]]
|manuals=
* [[Media:070-469.pdf|Tektronix 561A Calibration Procedure (PDF)]]
'''561, RM561'''
* [[Media:Tek 561a fcp april 1967.pdf|Tektronix 561A Factory Calibration Procedure (PDF, needs OCR)]]
* [[Media:070-261.pdf|Tektronix 561 Manual]]
* [[Media:Tek 561b fcp.pdf|Tektronix 561B Factory Calibration Procedure (PDF, needs OCR)]]
* [[Media:070-289.pdf|Tektronix RM561 Manual]] (OCR)
* [http://w140.com/mmm/tek-561b.pdf Tektronix 561B Manual (PDF)]
 
* [http://w140.com/tek-561s.pdf Tektronix 561S Manual (PDF)]
'''561A'''
* [http://w140.com/tek_560_561_product_release.pdf Tektronix 560 and 561 Product Release (PDF)]
* [[Media:070-342.pdf|Tektronix 561A Manual]]
* [http://w140.com/tek_561_irb.pdf Tektronix 561 Instrument Reference Book (OCR, PDF)]
<small>* '''Alternate:''' [https://bama.edebris.com/download/tek/561a/561a.djvu DjVu @ BAMA]
* [http://bama.edebris.com/download/tek/561/561scope.pdf Tektronix 561 Manual (BAMA, PDF)]
 
* [http://bama.edebris.com/download/tek/561a/561a.djvu Tektronix 561A Manual (BAMA, DjVu)]
'''561B, RM561A/B'''
* [http://bama.edebris.com/download/tek/561b/561b.djvu Tektronix 561B Manual (BAMA, DjVu)]
* [[Media:070-0352-01.pdf|RM561A manual 070-0352-01 needed]]
* [[Media:Tek 561a field recal proc sep 1962.pdf | Tektronix 561A Field Recalibration Procedure, September 1962 (PDF, needs OCR)]]
* [[Media:070-0802-00.pdf|Tektronix 561B Manual]]
* [[Media:Tek 561s fcp jan 1964.pdf | Tektronix 561S Factory Calibration Procedure, January 1964 (PDF, needs OCR)]]
* [[Media:TM 9-6625-963-14-1.pdf|Military Tektronix RM561A & RM561B Manual]]
* [[Media:Tek 561a manufacturing memos late 1964.pdf]]
<small>* '''Alternate:''' RM561A & RM561B [https://bama.edebris.com/download/tek/561b/561b.djvu DjVu @ BAMA] / [https://bama.edebris.com/download/tek/561/561scope.pdf PDF @ BAMA]</small>
 
'''561S'''
* [[Media:070-417.pdf|Tektronix 561S Manual]]
 
<small>
'''Calibration'''
* [[Media:Tek 561 fcp.pdf|Tektronix 561 Factory Calibration Procedure]]
* [[Media:070-469.pdf|Tektronix 561A Calibration Procedure]]
* [[Media:Tek 561a fcp april 1967.pdf|Tektronix 561A Factory Calibration Procedure]]
* [[Media:Tek 561a field recal proc sep 1962.pdf | Tektronix 561A Field Recalibration Procedure, September 1962]]
* [[Media:Tek 561b fcp.pdf|Tektronix 561B Factory Calibration Procedure]]
* [[Media:Tek 561s fcp jan 1964.pdf | Tektronix 561S Factory Calibration Procedure, January 1964]]
 
'''Modifications'''
* [[Media:Tektronix561_NO040267FieldModification.pdf | Tektronix 561 #040-267 Field Modification Instructions]]
* [[Media:Tektronix561_NO040288FieldModification.pdf | Tektronix 561 #040-288 Field Modification Instructions]]
* [[Media:Tektronix561_NO040347FieldModification.pdf | Tektronix 561 #040-347 Field Modification Instructions]]
* [[Media:Tek_561A_mod210C.pdf|Tektronix 561A Mod 210C]]
* [[Media:Tek 561b mod 272c.pdf|Tektronix 561B Mod 272C]]
* [[Media:Tek 561b mod 272c.pdf|Tektronix 561B Mod 272C]]


'''Miscellaneous'''
<!-- * [[Media:Tek 561A manufacturing memos late 1964.pdf]] missing-->
* [[Media:tek_561_irb.pdf|Tektronix 561 Instrument Reference Book]] (OCR)
* [[Media:tek_560_561_product_release.pdf|Tektronix 560 and 561 Product Release]]
</small>
}}
}}
The '''Tektronix 561''' is a [[560-series_scopes|560-series scope]] that was [[introduced in 1961]] and
The '''Tektronix 561''' is a [[560-series_scopes|560-series scope]] that was [[introduced in 1961]] and produced in various versions well into the 1970s.
produced in various versions well into the 1970s.
The designer of the 561 was [[Bob Shand]].


==Versions==
==Versions==
Over its life, the 561 was actually a series of four very different scopes,  
Over its life, the 561 was actually a series of four very different scopes, plus the rack mount versions of each.   
plus the rack mount versions of each.   


===561===
===561===
The original 561 and RM561 were introduced in 1961.   
The original 561 and RM561 were introduced in 1961.   
Similar to the 560, also [[introduced in 1961]], the 561 has a round CRT.   
Similar to the 560, also [[introduced in 1961]], the 561 has a round CRT.   
It supports the 50, 60 and 70 series of plug-ins, with the highest system bandwidth of 4 MHz. Some later plugins intended for use with the 561A or 561B have higher power requirements and may not be compatible with the 561.
It supports the 50, 60 and 70 series of plug-ins, with the highest system bandwidth of 4 MHz.  
The later 2- and 3- series plug-ins cannot be used in the 560 or 561, as they consume more power.
Early, low power, plugins have the nylon guide on their backplane pointing into the plugin, while the later, higher power consuming, plugins have those nylon guides pointing outward.
The outward pointing guide will bump into the chassis of a 560 or 561, preventing it from fully inserting.
The 561A and all later 560 series scopes, with higher capability power supplies, have a hole in the chassis that allows the outward pointing nylon guide to clear, allowing full insertion.


The 561 uses the [[T5032]] CRT, which has a glass envelope. The 561 and later versions also had a front panel calibrator signal for calibrating the plugins to the mainframe. The 561 calibrator has 18 attenuation steps and can output a square wave with an amplitude of 200μV to 100V.
The 561 uses the [[T5032]] CRT, which has a glass envelope. The 561 and later versions also had a front panel calibrator signal for calibrating the plugins to the mainframe.  
The 561 calibrator has 18 attenuation steps and can output a square wave with an amplitude of 200 μV to 100 V.


Early serial numbers of the 561 use a neon bulb (B633) in the -100V regulator circuit, however, later versions (including the 561A) used a transistor. The modification for early units is documented at the end of the RM561 manual.
Early serial numbers of the 561 use a neon bulb (B633) in the -100 V regulator circuit, however, later versions (including the 561A and later) used a transistor.  
The modification for early units is documented at the end of the 561 manual and in the 040-288 Field Modification Instructions.
{{Documents|Link=561}}


===561A===
===561A===
Line 46: Line 75:
The 561A were the highest selling model in the 560 series.   
The 561A were the highest selling model in the 560 series.   


They introduced a revolutionary new CRT, the [[T5610]], incorporating many “firsts”  
They introduced a revolutionary new CRT, the [[T5610]], incorporating many “firsts” that would remain through most of Tek's analog scopes to follow –  
that would remain through most of Tek's analog scopes to follow – a rectangular faceplate
a rectangular faceplate allowing for a more compact CRT, and a ceramic CRT envelope which provided more mechanical precision than a blown glass tube.   
allowing for a more compact CRT, and a ceramic CRT envelope which provided more mechanical
This also enabled the use of a separate face plate made from a flat glass panel that could have the graticule markings printed on the [[phosphor]]  
precision than a blown glass tube.  This also enabled the use of a separate face plate made
side of the faceplate, totally eliminating parallax errors, and allowing for better edge illumination.  
from a flat glass panel that could have the graticule markings printed on the [[phosphor]]  
side of the faceplate, totally eliminating parallax errors, and allowing for better  
edge illumination.  


The 561A supports all 2 and 3 series plug-ins. 
The 561A was one of the mainframes offered for the [[Engine Analyzer System]].
The popular 60 and 70 series plug-ins were renamed
by adding a “2A, 2B, 3A, or 3B” in front to the two digit model number. 
New 3 series plug-ins were also added which consume more power than the original 60 and 70 series. 
Due to the higher power consumption, these newer plug-ins can not be used in the original 561. 
The highest bandwidth plug-ins gave a system bandwidth of 10 MHz.


The 561A was one of the mainframes offered for the [[Engine Analyzer]] package.
An RM561A with two custom plug-ins was incorporated (upside-down) as the standard display in the [http://en.wikipedia.org/wiki/LINC LINC] computer.


An RM561A with two custom plug-ins was incorporated (upside-down) as the standard display in the [http://en.wikipedia.org/wiki/LINC LINC] computer.
The Mod210C replaced the T5610 ceramic CRT with the T5032 glass CRT and an external graticule. The graticule illumination was changed to red and the BNC connectors of the scope and plugins were replaced with UHF connectors. The graticule has an engraved sinewave. A green light filter was added between the CRT and the graticule.
{{Documents|Link=561A}}
{{PatentLinks|561A}}


===561B===
===561B===
The 561B / RM561B were [[introduced in 1969]].
The 561B / RM561B were [[introduced in 1969]].
The 561B uses the same [[560-series plug-ins]] used by the 561A.
The 561B uses the same [[560-series plug-ins]] used by the 561A.
The 561B models actually provided no performance improvements over the 561A,  
The 561B models actually provided no performance improvements over the 561A, with the change being limited to all solid state design, including the HV rectifiers.   
with the change being limited to all solid state design, including the HV rectifiers.   
While this change improves reliability of the mainframe, Tektronix never produced fully solid state amplifier or non-sampling timebase plug-ins for the 560 Series.
While this change improves reliability of the mainframe,  
{{Documents|Link=561B}}
Tektronix never produced fully solid state amplifier or non-sampling timebase plug-ins for the 560 Series.
{{PatentLinks|561B}}


===561S===
===561S===
A special 561S was introduced as a special product, modified from a 561A.
A special 561S was introduced as a special product, modified from a 561A. It did not appear in any Tek catalog.   
It did not appear in any Tek catalog.   
With special modified amplifier and time base ([[3A1S]] and [[3B1S]]), and a special CRT ([[T5033]]), it achieved a 25 MHz system bandwidth, which is 2.5 times the bandwidth of a 561A.
With special modified amplifier and time base ([[3A1S]] and [[3B1S]]),
and a special CRT ([[T5033]]), it achieved a 25 MHz system bandwidth,  
which is 2.5 times the bandwidth of a 561A.


The 3A1S and 3B1S were the only plug-ins that could be used in the 561S
The 3A1S and 3B1S were the only plug-ins that could be used in the 561S because the T5033 CRT has higher deflection sensitivity than the CRT used in the 561, 561A, and 561B.   
because the T5033 CRT has higher deflection sensitivity than the CRT used in
The vertical deflection sensitivity of the T5033 is 11.7 V/cm. The 561A has the [[T561]] CRT which has a vertical deflection sensitivity of 19.5 V/cm.  
the 561, 561A, and 561B.  The vertical deflection sensitivity of the  
T5033 is 11.7 V/cm. The 561A has the [[T561]] CRT which has a vertical
deflection sensitivity of 19.5 V/cm.  


The higher bandwidth of the 561S came at the expense of  
The higher bandwidth of the 561S came at the expense of trading off some of the advances gained in the original 561A.   
trading off some of the advances gained in the original 561A.   
The CRT is a conventional glass envelope, without internal graticule.   
The CRT is a conventional glass envelope, without internal graticule.   
Also, the scale was reduced from 8 × 10 divisions to 6 × 10.
Also, the scale was reduced from 8 × 10 divisions to 6 × 10. The 561S has no post-deflection acceleration, and a CRT cathode voltage of -3,300 V, like the other 561 models.
The 561S has no post-deflection acceleration, and a CRT cathode
{{Documents|Link=561S}}
voltage of -3,300 V, like the other 561 models.
{{PatentLinks|561S}}
 
===Plugin Compatibility=== 
The popular 60 and 70 series plug-ins were later given a “2A, 2B, 3A, or 3B” prefix.
The highest bandwidth plug-ins gave a system bandwidth of 10 MHz when used in the 561A and 561B.
 
The 561A, RM561A, 561B, and RM561B are compatible with all of the 2 and 3-series plugins that Tektronix made.
The 561 and RM561 have limited compatibility with some 3-series plugins, mainly due to the CRT circuit.
For plugins such as the 3B1 and 3B3 time bases there are issues with the blanking and intensified sweep.
The 561A and subsequent models used a dual-secondary winding transformer in the CRT power supply, with one winding used in an intensifying pulse circuit which the original 561 lacked.
Other 3-series plugins may be used in the original 561 with some modifications – for example, to use a 3A74 4-channel vertical plugin in a 561 sn101 to 579, the +6 V unregulated supply needs to be disconnected from both plugin connectors (pin 18).
Later 561's with sn580 and higher already had this change implemented. More information regarding the use of 3-series plugins and the required modifications (if available) can be found in the Tektronix 561 Instrument Reference Book (IRB).


{{BeginSpecs}}
{{BeginSpecs}}
Line 97: Line 124:
{{Spec | Bandwidth |  DC to  4 MHz (with [[3A75]], may vary with other plug-ins)  }}
{{Spec | Bandwidth |  DC to  4 MHz (with [[3A75]], may vary with other plug-ins)  }}
{{Spec | Rise time | 0.09 μs }}
{{Spec | Rise time | 0.09 μs }}
{{Spec | Power Consumption | 185 W with [[72]] & [[67]] plug-ins}}
{{Spec | Power Consumption | 185 W with [[72]] & [[67]] plug-ins}}


{{SpecGroup | 561A & 561B }}
{{SpecGroup | 561A & 561B }}
Line 103: Line 130:
{{Spec | Rise time | 0.024 μs }}
{{Spec | Rise time | 0.024 μs }}


{{Spec | Power Consumption | 178 W with plug-ins }}
{{Spec | Power Consumption | 178 W with plug-ins }}
{{SpecGroup | 561S }}
{{SpecGroup | 561S }}
{{Spec | Bandwidth | DC to  25 MHz (with [[3A1S]], may vary with other plug-ins)  }}
{{Spec | Bandwidth | DC to  25 MHz (with [[3A1S]], may vary with other plug-ins)  }}
{{Spec | Rise time | 0.014 μs }}
{{Spec | Rise time | 0.014 μs }}
{{Spec | Power Consumption | 210 W to 240 W with plug-ins }}
{{Spec | Power Consumption | 210 W to 240 W with plug-ins }}


{{SpecGroup | all}}
{{SpecGroup | all}}
Line 113: Line 140:
{{Spec | Thermal Protection | Automatic resetting thermal cutout, in case internal temperature exceeds safe operating level }}
{{Spec | Thermal Protection | Automatic resetting thermal cutout, in case internal temperature exceeds safe operating level }}
{{Spec | Anode Potential | 3.5 kV}}
{{Spec | Anode Potential | 3.5 kV}}
{{Spec | Screen Area | 8 cm × 10 cm ( 561S: 6 cm x 10 cm ) }}
{{Spec | Screen Area | 8 cm × 10 cm ( 561S: 6 cm x 10 cm ) }}
{{Spec | Construction  | Aluminum alloy chassis. Anodized front panel}}
{{Spec | Construction  | Aluminum alloy chassis. Anodized front panel}}
{{EndSpecs}}
{{EndSpecs}}
Line 120: Line 147:
* [http://www.museum-nt.de/objekte/tek_561a.html 561A @ museum-nt.de]
* [http://www.museum-nt.de/objekte/tek_561a.html 561A @ museum-nt.de]


==Pictures of 561 ==
==Pictures==
===561===
<gallery>
Tek 561 trace.jpg | 561 with Camera Mount
561 Front.jpeg | 561 with Round CRT and External Graticule
561 Left.jpeg | 561 Left Side
561 Right.jpeg | 561 Right Side
561 Back.jpeg          | 561 Rear
561 PSU.jpg            | 561 Power Supply
561 LeftClose.jpg      | 561 Power Supply Tubes
561 PSU LV.jpg        | Low Voltage Power Supply
561 PSU HV.jpg        | High Voltage Power Supply
561 HVCover.jpg        | High Voltage Power Supply Cover
561 BayConnector.jpg  | Plugin Connector
561 Calibrator.jpg    | Calibrator Circuit
561 FrontControls.jpeg | Calibrator
561 CRTNeck.jpg | Deflection Plate Connections
561 CRTSocket.jpg | CRT Socket
</gallery>
 
===RM561===
<gallery>
<gallery>
Tek 561 trace.jpg|Tek 561 with camera mount
Tek rm561.jpg |RM561 with wrong CRT Bezel plus Two [[75|Type 75]] (3A75) Amplifier Plugins
561 Front.jpeg|Tek 561 with round CRT and external graticule
RM561 with 3A1 and 3B4 from NASA AMES.jpg | RM561 with [[3A1]] and [[3B4]] from NASA AMES
561 Left.jpeg|Left side of the scope
RM561_int_3.jpeg | RM561 Inside Top
561 Right.jpeg|Right side of the scope
RM561_int_2.jpeg | RM561 Inside Top Right
561 Back.jpeg|Back of the scope
RM561_int_1.jpeg | RM561 Inside Top Left
561 PSU.jpg|Powersupply
561 LeftClose.jpg|Powersupply tubes
561 PSU LV.jpg|Low voltage powersupply
561 PSU HV.jpg|High voltage powersupply
561 HVCover.jpg|High voltage powersupply cover
561 BayConnector.jpg|Plugin connector
561 Calibrator.jpg|Calibrator circuit
561 FrontControls.jpeg|Calibrator
561 CRTNeck.jpg|Deflection plate connections
561 CRTSocket.jpg|CRT socket
</gallery>
</gallery>


==Pictures of 561A==
===561A===
<gallery>
<gallery>
561a.jpg | 561A
561a-2.jpg                 | 561A Front
561a-2.jpg | 561A
561a.jpg                   | 561A with Trace
Tek 561a left front.jpg|561A
Tek 561a left front.jpg     | 561A Left Front
Tek 561a guernsey.jpg|Guernsey-made 561A with a [[3L5]] and a Guernsey-made [[3B3]]
Tek 561a guernsey.jpg       | Guernsey-made 561A with a [[3L5]] and a Guernsey-made [[3B3]]
Tek 561a guernsey rear.jpg|Guernsey-made 561A, rear view
Tek 561a guernsey rear.jpg | Guernsey-made 561A Rear
Tek 561a left internal.jpg|561A (plug-in missing tubes)
Tek 561a left internal.jpg | 561A (plug-in missing tubes)
Tek 561a right internal.jpg|561A
Tek 561a right internal.jpg | 561A Right Internals
Tek 561a lvps schem.png|561A Low Voltage Power Supply
Tek 561a lvps schem.png     | 561A Low Voltage Power Supply
Tek 561a crt schem.png|561A CRT Circuit
Tek 561a crt schem.png     | 561A CRT Circuit
</gallery>
</gallery>


==Pictures of 561B==
===561A/MOD210C===
<gallery>
<gallery>
Tek 561b 1.JPG|561B
Tek_561A_MOD210C_01.jpg     | 561A with Mod210C Power Off
Tek 561b 2.JPG|561B
Tek_561A_MOD210C_02.jpg     | 561A with Mod210C Graticule at 100% & Showing Signal
Tek 561b 3.JPG|561B
Tek_561A_MOD210C_04.jpg     | 561A with Mod210C Graticule at Right
Tek 561b 4.JPG|561B
Tek_561A_MOD210C_03.jpg     | 561A with Mod210C Comparing Sinewave Signal to the Engraved Signal
Tek 561b 3a7 3b4.jpg|561B with [[3A7]] and [[3B4]]
</gallery>
Tek 561b trace.jpg|561B trace
561b_inside_right.jpg | right inside
561b_inside_left.jpg | left inside
561b_inside_top.jpg | top inside


===RM561A===
<gallery>
RM561A.JPG| RM561A with [[3A74]] & [[2B67]] Plugins
Tek rm561a 2a63 2b67.jpg| RM561A with [[2A63]] and [[2B67]]
Tek rm561a top inside.jpg| RM561A Top Inside
LINC console.jpg | RM561A in LINC Computer Console
RM561A with 3B3 and 3A74.jpg | RM561A with [[3B3]] and [[3A74]]
</gallery>
</gallery>


==Pictures of 561S ==
===561B===
<gallery>
<gallery>
Tek 561b 1.JPG        | 561B Front Right
Tek 561b 2.JPG        | 561B Front Upper
Tek 561b 3.JPG        | 561B Front Left
Tek 561b 4.JPG        | 561B Rear
Tek 561b 3a7 3b4.jpg  | 561B with [[3A7]] and [[3B4]]
Tek 561b trace.jpg    | 561B Trace
561b_inside_right.jpg | 561B Left Inside
561b_inside_left.jpg  | 561B Right Inside
561b_inside_top.jpg  | 561B Top Inside
</gallery>


Tek 561s.jpg|Tek 561S
===R561B===
Tek 561s 3a1s 3b1s.jpg|561S with [[3A1S]] and [[3B1S]]
<gallery>
Tek 561s rear.jpg|561S rear
Tek r561b.jpg         | R561B Front
Tek 3a1s 3b1s.jpg| [[3A1S]] and [[3B1S]] plugins
</gallery>
</gallery>
==Pictures of RM561(A) ==
 
===561S===
<gallery>
<gallery>
Tek rm561.jpg |Tek RM561 with two [[75|Type 75]] (3A75) amplifier plugins
Tek 561s.jpg           | 561S Front
RM561A.JPG|Tek RM561A with [[3A74]] and [[2B67]] plugins
Tek 561s 3a1s 3b1s.jpg | 561S with [[3A1S]] and [[3B1S]]
Tek rm561a 2a63 2b67.jpg|RM561A with [[2A63]] and [[2B67]]
Tek 561s rear.jpg     | 561S Rear
Tek rm561a top inside.jpg|RM561A top inside
Tek 3a1s 3b1s.jpg      | [[3A1S]] and [[3B1S]] Plugins
LINC console.jpg | RM561A in LINC computer console
</gallery>
</gallery>
==Components==
{{Parts|561}}
{{Parts|561A}}
{{Parts|561B}}
{{Parts|561S}}


[[Category:560 series scopes]]
[[Category:560 series scopes]]

Latest revision as of 14:39, 18 August 2024

Tektronix 561
10(4) MHz "General Purpose Scope"
Tektronix 561B

Produced from 1961 to 1974

Manuals

561, RM561

561A

* Alternate: DjVu @ BAMA

561B, RM561A/B

* Alternate: RM561A & RM561B DjVu @ BAMA / PDF @ BAMA

561S

Calibration

Modifications

Miscellaneous

(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix 561 is a 560-series scope that was introduced in 1961 and produced in various versions well into the 1970s. The designer of the 561 was Bob Shand.

Versions

Over its life, the 561 was actually a series of four very different scopes, plus the rack mount versions of each.

561

The original 561 and RM561 were introduced in 1961. Similar to the 560, also introduced in 1961, the 561 has a round CRT. It supports the 50, 60 and 70 series of plug-ins, with the highest system bandwidth of 4 MHz. The later 2- and 3- series plug-ins cannot be used in the 560 or 561, as they consume more power. Early, low power, plugins have the nylon guide on their backplane pointing into the plugin, while the later, higher power consuming, plugins have those nylon guides pointing outward. The outward pointing guide will bump into the chassis of a 560 or 561, preventing it from fully inserting. The 561A and all later 560 series scopes, with higher capability power supplies, have a hole in the chassis that allows the outward pointing nylon guide to clear, allowing full insertion.

The 561 uses the T5032 CRT, which has a glass envelope. The 561 and later versions also had a front panel calibrator signal for calibrating the plugins to the mainframe. The 561 calibrator has 18 attenuation steps and can output a square wave with an amplitude of 200 μV to 100 V.

Early serial numbers of the 561 use a neon bulb (B633) in the -100 V regulator circuit, however, later versions (including the 561A and later) used a transistor. The modification for early units is documented at the end of the 561 manual and in the 040-288 Field Modification Instructions.

Documents Referencing 561

(no results)

561A

The short lived 561 was replaced by the 561A and the rack-mount version RM561A in 1962. The 561A were the highest selling model in the 560 series.

They introduced a revolutionary new CRT, the T5610, incorporating many “firsts” that would remain through most of Tek's analog scopes to follow – a rectangular faceplate allowing for a more compact CRT, and a ceramic CRT envelope which provided more mechanical precision than a blown glass tube. This also enabled the use of a separate face plate made from a flat glass panel that could have the graticule markings printed on the phosphor side of the faceplate, totally eliminating parallax errors, and allowing for better edge illumination.

The 561A was one of the mainframes offered for the Engine Analyzer System.

An RM561A with two custom plug-ins was incorporated (upside-down) as the standard display in the LINC computer.

The Mod210C replaced the T5610 ceramic CRT with the T5032 glass CRT and an external graticule. The graticule illumination was changed to red and the BNC connectors of the scope and plugins were replaced with UHF connectors. The graticule has an engraved sinewave. A green light filter was added between the CRT and the graticule.

Documents Referencing 561A

(no results)

561B

The 561B / RM561B were introduced in 1969. The 561B uses the same 560-series plug-ins used by the 561A. The 561B models actually provided no performance improvements over the 561A, with the change being limited to all solid state design, including the HV rectifiers. While this change improves reliability of the mainframe, Tektronix never produced fully solid state amplifier or non-sampling timebase plug-ins for the 560 Series.

Documents Referencing 561B

Document Class Title Authors Year Links
070-0890-00.pdf Manual Engine Analyzer System 1968 Engine Analyzer System • 561B • 564B • 3A74 • 2B67 • 015-0108-00
Tekscope 1969 V1 N1 Feb 1969.pdf Article An Extended Value John Durecka 1969 561B • 564B
Tekscope 1969 V1 N2 Apr 1969.pdf Article A New Insight Into Reciprocating Machinery Bill Verhoef 1969 Engine Analyzer System • 3A74 • 561B • 564B

Patents that may apply to 561B

Page Title Inventors Filing date Grant date Links
Patent US 3453403A Power selection device Eldon Hoffman 1966-08-18 1969-07-01 115 • 140 • 141 • 141A • 144 • 145 • 146 • 147 • 148 • 149 • 149A • 230 • 284 • 286 • 453 • 454 • 491 • 520A • 521A • 522 • 545B • 547 • 556 • 561B • 564B • 568 • 576 • 611 • 647A • 2101 • 2601 • 5030 • R5030 • 5031 • R5031 • 7503 • 7504 • 7704 • 7704A • 7904 • R7903

561S

A special 561S was introduced as a special product, modified from a 561A. It did not appear in any Tek catalog. With special modified amplifier and time base (3A1S and 3B1S), and a special CRT (T5033), it achieved a 25 MHz system bandwidth, which is 2.5 times the bandwidth of a 561A.

The 3A1S and 3B1S were the only plug-ins that could be used in the 561S because the T5033 CRT has higher deflection sensitivity than the CRT used in the 561, 561A, and 561B. The vertical deflection sensitivity of the T5033 is 11.7 V/cm. The 561A has the T561 CRT which has a vertical deflection sensitivity of 19.5 V/cm.

The higher bandwidth of the 561S came at the expense of trading off some of the advances gained in the original 561A. The CRT is a conventional glass envelope, without internal graticule. Also, the scale was reduced from 8 × 10 divisions to 6 × 10. The 561S has no post-deflection acceleration, and a CRT cathode voltage of -3,300 V, like the other 561 models.

Documents Referencing 561S

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Plugin Compatibility

The popular 60 and 70 series plug-ins were later given a “2A, 2B, 3A, or 3B” prefix. The highest bandwidth plug-ins gave a system bandwidth of 10 MHz when used in the 561A and 561B.

The 561A, RM561A, 561B, and RM561B are compatible with all of the 2 and 3-series plugins that Tektronix made. The 561 and RM561 have limited compatibility with some 3-series plugins, mainly due to the CRT circuit. For plugins such as the 3B1 and 3B3 time bases there are issues with the blanking and intensified sweep. The 561A and subsequent models used a dual-secondary winding transformer in the CRT power supply, with one winding used in an intensifying pulse circuit which the original 561 lacked. Other 3-series plugins may be used in the original 561 with some modifications – for example, to use a 3A74 4-channel vertical plugin in a 561 sn101 to 579, the +6 V unregulated supply needs to be disconnected from both plugin connectors (pin 18). Later 561's with sn580 and higher already had this change implemented. More information regarding the use of 3-series plugins and the required modifications (if available) can be found in the Tektronix 561 Instrument Reference Book (IRB).

Key Specifications

     — 561 —
Bandwidth DC to 4 MHz (with 3A75, may vary with other plug-ins)
Rise time 0.09 μs
Power Consumption 185 W with 72 & 67 plug-ins
     — 561A & 561B —
Bandwidth DC to 15 MHz (with 3A5, may vary with other plug-ins)
Rise time 0.024 μs
Power Consumption 178 W with plug-ins
     — 561S —
Bandwidth DC to 25 MHz (with 3A1S, may vary with other plug-ins)
Rise time 0.014 μs
Power Consumption 210 W to 240 W with plug-ins
     — all —
Line Voltage 105-125/210-250 VAC ±10%, selected via primary voltage selector and voltage range selector switches, 50 Hz to 60 Hz.
Thermal Protection Automatic resetting thermal cutout, in case internal temperature exceeds safe operating level
Anode Potential 3.5 kV
Screen Area 8 cm × 10 cm ( 561S: 6 cm x 10 cm )
Construction Aluminum alloy chassis. Anodized front panel

Links

Pictures

561

  • 561 with Camera Mount

    561 with Camera Mount

  • 561 with Round CRT and External Graticule

    561 with Round CRT and External Graticule

  • 561 Left Side

    561 Left Side

  • 561 Right Side

    561 Right Side

  • 561 Rear

    561 Rear

  • 561 Power Supply

    561 Power Supply

  • 561 Power Supply Tubes

    561 Power Supply Tubes

  • Low Voltage Power Supply

    Low Voltage Power Supply

  • High Voltage Power Supply

    High Voltage Power Supply

  • High Voltage Power Supply Cover

    High Voltage Power Supply Cover

  • Plugin Connector

    Plugin Connector

  • Calibrator Circuit

    Calibrator Circuit

  • Calibrator

    Calibrator

  • Deflection Plate Connections

    Deflection Plate Connections

  • CRT Socket

    CRT Socket

RM561

  • RM561 with wrong CRT Bezel plus Two Type 75 (3A75) Amplifier Plugins

    RM561 with wrong CRT Bezel plus Two Type 75 (3A75) Amplifier Plugins

  • RM561 with 3A1 and 3B4 from NASA AMES

    RM561 with 3A1 and 3B4 from NASA AMES

  • RM561 Inside Top

    RM561 Inside Top

  • RM561 Inside Top Right

    RM561 Inside Top Right

  • RM561 Inside Top Left

    RM561 Inside Top Left

561A

  • 561A Front

    561A Front

  • 561A with Trace

    561A with Trace

  • 561A Left Front

    561A Left Front

  • Guernsey-made 561A with a 3L5 and a Guernsey-made 3B3

    Guernsey-made 561A with a 3L5 and a Guernsey-made 3B3

  • Guernsey-made 561A Rear

    Guernsey-made 561A Rear

  • 561A (plug-in missing tubes)

    561A (plug-in missing tubes)

  • 561A Right Internals

    561A Right Internals

  • 561A Low Voltage Power Supply

    561A Low Voltage Power Supply

  • 561A CRT Circuit

    561A CRT Circuit

561A/MOD210C

  • 561A with Mod210C Power Off

    561A with Mod210C Power Off

  • 561A with Mod210C Graticule at 100% & Showing Signal

    561A with Mod210C Graticule at 100% & Showing Signal

  • 561A with Mod210C Graticule at Right

    561A with Mod210C Graticule at Right

  • 561A with Mod210C Comparing Sinewave Signal to the Engraved Signal

    561A with Mod210C Comparing Sinewave Signal to the Engraved Signal

RM561A

  • RM561A with 3A74 & 2B67 Plugins

    RM561A with 3A74 & 2B67 Plugins

  • RM561A with 2A63 and 2B67

    RM561A with 2A63 and 2B67

  • RM561A Top Inside

    RM561A Top Inside

  • RM561A in LINC Computer Console

    RM561A in LINC Computer Console

  • RM561A with 3B3 and 3A74

    RM561A with 3B3 and 3A74

561B

  • 561B Front Right

    561B Front Right

  • 561B Front Upper

    561B Front Upper

  • 561B Front Left

    561B Front Left

  • 561B Rear

    561B Rear

  • 561B with 3A7 and 3B4

    561B with 3A7 and 3B4

  • 561B Trace

    561B Trace

  • 561B Left Inside

    561B Left Inside

  • 561B Right Inside

    561B Right Inside

  • 561B Top Inside

    561B Top Inside

R561B

  • R561B Front

    R561B Front

561S

Components

Some Parts Used in the 561

Part Part Number(s) Class Description Used in
0G3 154-0291-00 Gas Discharge Tube (Voltage regulator) 85 V voltage reference 132 • 506 • 547 • 560 • 561 • 561A • 561S • 564 • 565 • 567 • 661 • TU-4 • Z • Keithley 610
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
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
6AS7 154-020 • 154-0020-00 Vacuum Tube (Pentode) dual power triode 160 • 506 • 511A • 512 • 513 • 517 • 517A • 524 • 561 • 561A • 561S • 564
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
6BL8 154-0278-00 Vacuum Tube (Triode/Pentode) triode-pentode combo 67 • 2B67 • 3B1 • 3B1S • 3B2 • 3B3 • 3B4 • 503 • 504 • 506 • 516 • 549 • 561 • 561A • 561S • 564 • 565 • 567 • Telequipment D52 • Telequipment D56 • Telequipment S31 • Telequipment S32 • Telequipment S32A • Telequipment S51 • Telequipment S52
6CZ5 154-0167-00 Vacuum Tube (Pentode) power pentode 317 • 502 • 506 • 526 • 555 • 561 • 561A • 561S • 564 • 565 • 567
7233 154-307 • 154-0307-00 Vacuum Tube (Triode) low-mu triode 132 • 506 • 561 • 561A • 561S • 564 • 565
T5030 154-0264-00 • 154-0265-00 • 154-0266-00 • 154-0267-00 • 154-0341-00 CRT CRT 503 • 504 • 560 • 561 • 661
T5032 154-0319-00 • 154-0320-00 • 154-0321-00 • 154-0322-00 • 154-0355-00 • 154-0372-00 • 154-0373-00 • 154-0374-00 • 154-0375-00 • 154-0376-00 • 154-0377-00 • 154-0449-00 • 154-0454-00 • 154-0455-00 • 154-0456-00 CRT 5" rectangular-faceplate CRT 561 • 567


Some Parts Used in the 561A

Part Part Number(s) Class Description Used in
0G3 154-0291-00 Gas Discharge Tube (Voltage regulator) 85 V voltage reference 132 • 506 • 547 • 560 • 561 • 561A • 561S • 564 • 565 • 567 • 661 • TU-4 • Z • Keithley 610
12BH7 154-0046-00 Vacuum Tube (Dual Triode) dual triode 506 • 517A • 561A • 561S • 564 • 567
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
6AS7 154-020 • 154-0020-00 Vacuum Tube (Pentode) dual power triode 160 • 506 • 511A • 512 • 513 • 517 • 517A • 524 • 561 • 561A • 561S • 564
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
6BL8 154-0278-00 Vacuum Tube (Triode/Pentode) triode-pentode combo 67 • 2B67 • 3B1 • 3B1S • 3B2 • 3B3 • 3B4 • 503 • 504 • 506 • 516 • 549 • 561 • 561A • 561S • 564 • 565 • 567 • Telequipment D52 • Telequipment D56 • Telequipment S31 • Telequipment S32 • Telequipment S32A • Telequipment S51 • Telequipment S52
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
7233 154-307 • 154-0307-00 Vacuum Tube (Triode) low-mu triode 132 • 506 • 561 • 561A • 561S • 564 • 565
T5610 154-0396-00 • 154-0397-00 • 154-0398-00 • 154-0399-00 • 154-0400-00 • 154-0401-00 • 154-0402-00 • 154-0403-00 • 154-0404-00 • 154-0405-00 • 154-0406-00 • 154-0407-00 CRT rectangular-faceplate CRT 561A
T5611 154-0531-00 • 154-0531-01 • 154-0531-02 • 154-0531-03 • 154-0613-00 • 154-0613-01 • 154-0613-02 • 154-0613-03 • 154-0614-00 • 154-0614-01 • 154-0614-02 • 154-0614-03 CRT ceramic CRT 561A • 561B • 567 • 568


Some Parts Used in the 561B

Part Part Number(s) Class Description Used in
120-0575-00 120-0575-00 Discrete component power transformer 561B
2N3739 151-0201-00 Discrete component Silicon NPN power transistor 013-002 • 106 • 4501 • 561B • R561B • 564B • R564B • 568 • 7503 • 7504
T5611 154-0531-00 • 154-0531-01 • 154-0531-02 • 154-0531-03 • 154-0613-00 • 154-0613-01 • 154-0613-02 • 154-0613-03 • 154-0614-00 • 154-0614-01 • 154-0614-02 • 154-0614-03 CRT ceramic CRT 561A • 561B • 567 • 568


Some Parts Used in the 561S

Part Part Number(s) Class Description Used in
0G3 154-0291-00 Gas Discharge Tube (Voltage regulator) 85 V voltage reference 132 • 506 • 547 • 560 • 561 • 561A • 561S • 564 • 565 • 567 • 661 • TU-4 • Z • Keithley 610
12BH7 154-0046-00 Vacuum Tube (Dual Triode) dual triode 506 • 517A • 561A • 561S • 564 • 567
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
6AS7 154-020 • 154-0020-00 Vacuum Tube (Pentode) dual power triode 160 • 506 • 511A • 512 • 513 • 517 • 517A • 524 • 561 • 561A • 561S • 564
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
6BL8 154-0278-00 Vacuum Tube (Triode/Pentode) triode-pentode combo 67 • 2B67 • 3B1 • 3B1S • 3B2 • 3B3 • 3B4 • 503 • 504 • 506 • 516 • 549 • 561 • 561A • 561S • 564 • 565 • 567 • Telequipment D52 • Telequipment D56 • Telequipment S31 • Telequipment S32 • Telequipment S32A • Telequipment S51 • Telequipment S52
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
7233 154-307 • 154-0307-00 Vacuum Tube (Triode) low-mu triode 132 • 506 • 561 • 561A • 561S • 564 • 565
T5033 154-0748-00 CRT 5" CRT 561S • 506
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