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discontinued=1974 |
discontinued=1974 |
manuals=
manuals=
* [[Media:Tektronix561ServiceManual.pdf | Tektronix 561 Manual (PDF)]]
* [[Media:Tektronix561_NO040267FieldModification.pdf | Tektronix 561 #040-267 Field Modification Instructions (PDF)]]
* [[Media:Tektronix561_NO040288FieldModification.pdf | Tektronix 561 #040-288 Field Modification Instructions (PDF)]]
* [[Media:Tektronix561_NO040347FieldModification.pdf | Tektronix 561 #040-347 Field Modification Instructions (PDF)]]
* [[Media:Tek 561 fcp.pdf|Tektronix 561 Factory Calibration Procedure (PDF, needs OCR)]]
* [http://w140.com/tek_rm561.pdf Tektronix RM561 Manual (PDF)]
* [http://w140.com/tek_rm561.pdf Tektronix RM561 Manual (PDF)]
* [http://w140.com/mmm/tek-561a.pdf Tektronix 561A Manual (PDF)]
* [http://w140.com/mmm/tek-561a.pdf Tektronix 561A Manual (PDF)]
* [[Media:Tek 561 fcp.pdf|Tektronix 561 Factory Calibration Procedure (PDF, needs OCR)]]
* [[Media:070-469.pdf|Tektronix 561A Calibration Procedure (PDF)]]
* [[Media:070-469.pdf|Tektronix 561A Calibration Procedure (PDF)]]
* [[Media:Tek 561a fcp april 1967.pdf|Tektronix 561A Factory Calibration Procedure (PDF, needs OCR)]]
* [[Media:Tek 561a fcp april 1967.pdf|Tektronix 561A Factory Calibration Procedure (PDF, needs OCR)]]
* [http://bama.edebris.com/download/tek/561a/561a.djvu Tektronix 561A Manual (BAMA, DjVu)]
* [[Media:Tek 561a field recal proc sep 1962.pdf | Tektronix 561A Field Recalibration Procedure, September 1962 (PDF, needs OCR)]]
* [[Media:Tek 561b fcp.pdf|Tektronix 561B Factory Calibration Procedure (PDF, needs OCR)]]
* [[Media:Tek 561b fcp.pdf|Tektronix 561B Factory Calibration Procedure (PDF, needs OCR)]]
* [[Media:Tek 561A manufacturing memos late 1964.pdf]]
* [http://w140.com/mmm/tek-561b.pdf Tektronix 561B Manual (PDF)]
* [http://w140.com/mmm/tek-561b.pdf Tektronix 561B Manual (PDF)]
* [http://bama.edebris.com/download/tek/561b/561b.djvu Tektronix 561B Manual (BAMA, DjVu)]
* [[Media:Tek 561b mod 272c.pdf|Tektronix 561B Mod 272C]]
* [http://bama.edebris.com/download/tek/561/561scope.pdf Tektronix RM561A & RM561B Manual (BAMA, PDF)]
* [http://w140.com/tek-561s.pdf Tektronix 561S Manual (PDF)]
* [http://w140.com/tek-561s.pdf Tektronix 561S Manual (PDF)]
* [[Media:Tek 561s fcp jan 1964.pdf | Tektronix 561S Factory Calibration Procedure, January 1964 (PDF, needs OCR)]]
* [http://w140.com/tek_561_irb.pdf Tektronix 561 Instrument Reference Book (OCR, PDF)]
* [http://w140.com/tek_560_561_product_release.pdf Tektronix 560 and 561 Product Release (PDF)]
* [http://w140.com/tek_560_561_product_release.pdf Tektronix 560 and 561 Product Release (PDF)]
* [http://w140.com/tek_561_irb.pdf Tektronix 561 Instrument Reference Book (OCR, PDF)]
 
* [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)]
* [http://bama.edebris.com/download/tek/561b/561b.djvu Tektronix 561B Manual (BAMA, DjVu)]
* [[Media:Tek 561a field recal proc sep 1962.pdf]]
}}
}}
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
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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.
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.
The 561 uses the [[T5032]] CRT, which has a glass envelope.
 
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.
 
Early serial numbers of the 561 use a neon bulb (B633) in the -100V 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.


===561A===
===561A===
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side of the faceplate, totally eliminating parallax errors, and allowing for better  
side of the faceplate, totally eliminating parallax errors, and allowing for better  
edge illumination.  
edge illumination.  
The 561A supports all 2 and 3 series plug-ins. 
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.
The 561A was one of the mainframes offered for the [[Engine Analyzer]] package.
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===561B===
===561B===
The 561B / RM561B were [[introduced in 1969]].
The 561B / RM561B were [[introduced in 1969]].
The B models actually provided no performance improvements over 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,  
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 improves reliability of the mainframe, no all solid state plug-ins were ever designed. 
While this change improves reliability of the mainframe,  
The 561B uses the same 2 and 3 series plug-ins used by the 561A.
Tektronix never produced fully solid state amplifier or non-sampling timebase plug-ins for the 560 Series.


===561S===
===561S===
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The 561S has no post-deflection acceleration, and a CRT cathode
The 561S has no post-deflection acceleration, and a CRT cathode
voltage of -3,300 V, like the other 561 models.
voltage of -3,300 V, like the other 561 models.
===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 sn101to579, the +6V 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}}
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<gallery>
<gallery>
Tek 561 trace.jpg|Tek 561 with camera mount
Tek 561 trace.jpg|Tek 561 with camera mount
561 Front.jpeg|Tek 561 with round CRT and external graticule
561 Left.jpeg|Left side of the scope
561 Right.jpeg|Right side of the scope
561 Back.jpeg|Back of the scope
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==
==Pictures of 561A==
<gallery>
<gallery>
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561b_inside_left.jpg | left inside
561b_inside_left.jpg | left inside
561b_inside_top.jpg | top inside
561b_inside_top.jpg | top inside
 
Tek r561b.jpg|R561B
</gallery>
</gallery>


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Tek rm561a top inside.jpg|RM561A top inside
Tek rm561a top inside.jpg|RM561A top inside
LINC console.jpg | RM561A in LINC computer console  
LINC console.jpg | RM561A in LINC computer console  
RM561A with 3B3 and 3A74.jpg | RM561A with 3B3 and 3A74
RM561 with 3A1 and 3B4 from NASA AMES.jpg | RM561 with 3A1 and 3B4 from NASA AMES
</gallery>
</gallery>


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

Revision as of 23:35, 5 March 2021

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.

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. Some later plugins intended for use with the 561A or 561B have higher power requirements and may not be compatible with the 561.

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.

Early serial numbers of the 561 use a neon bulb (B633) in the -100V 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.

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 package.

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

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.

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.

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 sn101to579, the +6V 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 of 561

Pictures of 561A

Pictures of 561B

Pictures of 561S

Pictures of RM561(A)