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{{Oscilloscope Sidebar |
{{Oscilloscope Sidebar
title=Tektronix 549 |
|manufacturer=Tektronix
summary=30 MHz storage scope |
|series=500-series scopes
image=Tek-549 and d.jpg |
|model=549
caption=Tektronix 549 front |
|summary=30 MHz storage oscilloscope
introduced=1966 |
|image=Tek-549 and d.jpg
discontinued=1974 |
|caption=Tektronix 549 front
manuals=
|introduced=1965
* [http://w140.com/mmm/tek-549.pdf Tektronix 549 Manual (PDF)]
|discontinued=1974
* [http://bama.edebris.com/manuals/tek/549 549 manual on BAMA ]
|designers=Mel Holznagel;Bob Shand;
* [http://w140.com/tek_549_1968_catalog.pdf Tektronix 549 in 1968 Catalog (PDF)]
|manuals=
* [http://w140.com/Tektronix_549_deutsch_300dpi.pdf Tektronix 549 Introduction in German (PDF)]
* [[Media:070-0508-00.pdf | Tektronix 549 Manual]] (OCR)  
* [http://w140.com/tekwiki/images/e/e1/Tek_549-Remote-DS.pdf Tektronix 549 Remote Control Datasheet (PDF)]
* [https://w140.com/mmm/tek-549.pdf Tektronix 549 Manual]
* [[Media:Tek 549 prb crt socket leakage.pdf|Maintenance Note: 549 CRT Socket Leakage (PDF)]]
* [https://bama.edebris.com/manuals/tek/549 Tektronix 549 Manual] @ BAMA
* [[Media:Tek 549 prb ringing with 1a1.pdf|Maintenance Note: 549 Ringing with 1A1 (PDF)]]


* [[Media:tek_549_catalog.pdf|Tektronix 549 in 1968 Catalog (PDF, OCR)]]
====Maintenance Notes====
* [[Media:tek_549_german_intro.pdf|Tektronix 549 Introduction in German (PDF, OCR)]]
* [[Media:tek_549_crt_socket_leak.pdf|Maintenance Note: 549 CRT Socket Leakage]] (OCR)
* [[Media:tek_549_Remote_Control_DS.pdf|Tektronix 549 Remote Control Datasheet (PDF, OCR)]]
* [[Media:tek_549_note_ringing_1a1.pdf|Maintenance Note: 549 Ringing with 1A1]] (OCR)
* [[Media:tek_549_crt_socket_leak.pdf|Maintenance Note: 549 CRT Socket Leakage (PDF, OCR)]]
 
* [[Media:tek_549_note_ringing_1a1.pdf|Maintenance Note: 549 Ringing with 1A1 (PDF, OCR)]]
====Data Sheets and Catalogs====
* [[Media:tek_549_catalog.pdf|Tektronix 549 in 1968 Catalog]] (OCR)
* [[Media:tek_549_german_intro.pdf|Tektronix 549 Introduction in German]] (OCR)
* [[Media:tek_549_Remote_Control_DS.pdf|Tektronix 549 Remote Control Datasheet]] (OCR)
}}
}}
The '''Tektronix 549''' is the only [[CRT_storage_scope|storage scope]] in the 500 series (except for the [[537]] that never left prototype stage).
The '''Tektronix 549''' is the only [[CRT_storage_scope|storage scope]] in the 500 series (except for the [[537]] that never left prototype stage).


It takes a [[Letter-series_and_1-series_plug-ins|letter-series or 1-series vertical plug-in]].  
It takes a [[Letter-series_and_1-series_plug-ins|letter-series or 1-series vertical plug-in]].  
The 549 was [[introduced in 1966]] and discontinued after 1973.   
The 549 was [[introduced in 1965]] and discontinued after 1973.   
 
The 549 vertical output stage was designed by [[Mel Holznagel]].  [[Bob Shand]] did the mechanical design.


{{BeginSpecs}}
{{BeginSpecs}}
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{{Spec | Rise time | 12 ns }}
{{Spec | Rise time | 12 ns }}
{{Spec | Writing speed | 5 cm/μs }}
{{Spec | Writing speed | 5 cm/μs }}
{{Spec | Line voltage | 104/115/127/208/230 V<sub>AC</sub> ±10%,selected via primary voltage selector and voltage range selector switches, 50 to 60 Hz }}
{{Spec | Line voltage | 104/115/127 or 208/230/254 V<sub>AC</sub> ±10%, selected via primary voltage selector (inside cabinet) and voltage range selector (on rear panel), 50 to 60 Hz }}
{{Spec | Thermal protection | 65°C (150°F) Automatic resetting [[thermal cutoff]] }}
{{Spec | Thermal protection | 65°C (150°F) Automatic resetting [[thermal cutoff]] }}
{{Spec | Power consumption | 650 W, 750 VA }}
{{Spec | Power consumption | 650 W, 750 VA }}
{{Spec | Size |  43.2 cm × 32.9 cm × 60.7 cm (W/L/H, 13" × 24" × 17")  }}
{{Spec | Size     |  43.2 cm × 32.9 cm × 60.7 cm (W/L/H, 13" × 24" × 17")  }}
{{Spec | Weight | 31 kg (68 lb) }}
{{Spec | Weight   | 31 kg (68 lb) }}
{{Spec | Cooling  | AC Fan }}
{{Spec | Cooling  | AC Fan }}
{{Spec | Construction  | Aluminum alloy chassis. Anodized front panel. Blue vinyl coated cabinet }}
{{Spec | Accessories  | [[012-0102-00|012-0102-00 remote control cable/switch]] }}
{{EndSpecs}}
{{EndSpecs}}


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to have linear phase response over this same frequency range.   
to have linear phase response over this same frequency range.   


In the 549, this buffer is implemented as follows:  A [[6DJ8]] tube configured as a
In the 549, this buffer is implemented with a [[6DJ8]] cathode follower at the plug-in interface
cathode follower is used at the interface with the plug-in to present a high impedance
driving an NPN BJT differential amplifier at the bottom of a cascode with a [[7119]] tube on top.   
to the plug-in.  This input stage drives an NPN BJT differential amplifier,
which operates at the bottom of a cascode configuration with a [[7119]] tube on top.   
The output of the cascode (the plate of the 7119) drives the [[delay line]].   
The output of the cascode (the plate of the 7119) drives the [[delay line]].   


Since the entire signal path is differential,  
Since the entire signal path is differential, the common-mode voltage does not have to be zero,
the common-mode voltage does not have to be zero, and it is not;
and it is not – the differential signal in the delay line rides on 167 volts of DC.   
the differential signal in the delay line rides on 167 volts of DC.   


After the delay line, the signal enters another cascoded differential amplifier with NPN BJTs  
After the delay line, the signal enters another cascoded differential amplifier with NPN BJTs  
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The 549 uses the [[T5490]] CRT which has two storage targets, upper and lower,
The 549 uses the [[T5490]] CRT which has two storage targets, upper and lower,
whose storage mode and erase signals can be controlled independently.
whose storage mode and erase signals can be controlled independently.
There is a remote control cable/switch, part number 012-0102-00 (photo below),
 
that can erase the screen and reset the single sweep. It connects to an  
The [[012-0102-00|012-0102-00 remote control cable/switch]] (also used for [[564B]]) can be used to remotely erase the screen and reset the single sweep.  
[[Amphenol 165 series connectors|Amphenol 165-16 socket]] at the rear top of the scope.
It connects to an [[Amphenol 165 series connectors|Amphenol 165-16 socket]] at the rear top of the scope (see [[549 remote control connector]] for pin-out).


===Power Supply===
===Power Supply===
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Line input is connected to main transformer primary via two switches, one inside the chassis to select the 110 V or 230 V range, and another on the rear of the chassis to select Low/Medium/High voltage in either range.
Line input is connected to main transformer primary via two switches, one inside the chassis to select the 110 V or 230 V range, and another on the rear of the chassis to select Low/Medium/High voltage in either range.


Multiple secondary windings feeds diodes for rectification for different voltages. Both center-tap and bridge configuration is used.
Multiple secondary windings feeds diodes for rectification for different voltages. Both center-tap and bridge configuration is used. Transistors and/or tubes are used for regulation.  
Transistors and/or tubes are used for regulation.  


As is common in many Tektronix scopes, all regulated voltages are referred to the negative regulated rail (−150 V in this case) by fixed low-tolerance dividers.  Only the −150 V voltage is trimmed, its reference is a [[5651]] VR tube.  A [[12AX7]] is used as the comparator, three [[12B4]] in parallel are used as series pass tubes. A [[6AU6]] is used as an error amplifier.
As is common in many Tektronix scopes, all regulated voltages are referred to the negative regulated rail (−150 V in this case) by fixed low-tolerance dividers.  Only the −150 V voltage is trimmed, its reference is a [[5651]] VR tube.  A [[12AX7]] is used as the comparator, three [[12B4]] in parallel are used as series pass tubes. A [[6AU6]] is used as an error amplifier.
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The 549 has a 65°C (150°F) [[thermal cutoff]].
The 549 has a 65°C (150°F) [[thermal cutoff]].


The 549 uses a [[120-0423-00]] HV transformer.
The 549 uses a [[120-0423-00]] HV transformer driven by a [[6GF5]] tube from +470 V.
 
===HV Transformer Problem and Replacement===
The HV transformer (part #120-0423-00) uses epoxy impregnation like models 544,545B,546,547,556 and as such suffers the same issue of increasing losses with age unlike the earlier bee's wax transformers. This issue will eventually lead to failure of the HV oscillator circuit resulting in loss of display intensity, blooming and finally vanishing trace. One solution is to use a donor HV transformer out of a 564 storage scope. This was successfully implemented by Morris Odell and Deon Vandenberg however invented by another. A photo is provided below showing the new transformer installed with terminals arbitrarily labelled to help others perform the same task. Looking at the photo the top connections are obvious. The left middle connection goes to the right strip pin 9 (labelled as 9) The bottom section has two connections, one on the left towards the neons(labelled A) this goes to the anode of the driver tube V800 pin 7. The other obscured wire is the bottom left which goes to the 4th pin on the left strip (labelled as 4). Resistor R807 is to be changed from 39k to 47k. Resistor R2 is to be added between the junction of D836 and C842 and R837. (See schematic.) When this is done adjust the HT at the test point to -3700V (R855) and adjust R815 to make the grid voltage -3790V (located at test point labelled TP). To see the new transformer in action click on the bottom youtube link.


==Links==
==Links==
* [https://lazyelectrons.wordpress.com/2018/01/11/tektronix-549-restoration/ Rajesh's Tek 549 Restoration]
* [https://lazyelectrons.wordpress.com/2018/01/11/tektronix-549-restoration/ Rajesh's Tek 549 Restoration] / [https://www.youtube.com/watch?v=8rWH-uuf60U Video]
* [http://www.radiomuseum.org/forum/tektronix_the_storage_story.html Tektronix, the Storage Story]  (1966) @ radiomuseum.org  
* [http://www.radiomuseum.org/forum/tektronix_the_storage_story.html Tektronix, the Storage Story]  (1966) @ radiomuseum.org  
* A [https://www.youtube.com/watch?v=1SRtm7eva0A 549 @ YouTube]
* A [https://www.youtube.com/watch?v=1SRtm7eva0A 549 @ YouTube]
* [https://www.youtube.com/watch?v=D6szONQe1go&t=6s Deon's 549 with 564 HT Transformer]


==Pictures==
==Pictures==
<gallery>
<gallery>
Tek 549 trace2.jpg
Tek-549 and d.jpg               | 549 front, earlier round bezel
Tek 549 trace2..jpg
Tek 549 mt1.jpg                 | 549 front, later rectangular bezel
Tek 549 trace.jpg
Tek-549-front.jpg
Tek 549 front fl.jpg
Tek 549 trace2.jpg               |  
549_front.jpg|Front of a 549.
Tek_549-Front.jpeg              |
549_vert_amp.jpg|Vertical amp.
Tek_549-Stroage-Ctrl.jpeg        | 549 Storage controls
549_top.jpg|Top view.
Tek 549 trace2..jpg             |
549_storage_board.jpg|Storage board.
Tek 549 trace.jpg               |
549_inside_door.jpg|Power supply behind door.
Tek 549 front fl.jpg             |
Wellenkino_549-8.jpg|Right side internal.
549_front.jpg                   | Front of a 549
Wellenkino 549-7.jpg
Wellenkino 549-1.jpg             |
Wellenkino 549-6.jpg
Tek 549 front fl.jpg             |
Wellenkino 549-1.jpg
Tek 549 1a4 1.jpg               |
Tek 012-0102-00.jpg|012-0102-00 remote control for 549
Tek 549 1a4 2.jpg               |
Tek 012-0102-00 photo.jpg|012-0102-00 remote control for 549
Tek_549-Rear.jpeg                | 549 Rear 
Tek 549 mt1.jpg|549 with Rectangular Bezel
Tek_549-Line-Range.jpeg          | Line voltage selector           
Tek 549 front fl.jpg
Tek 549 1a4 3.jpg               |
Tek 549 1a4 1.jpg
Tek 549 1a4 4.jpg               |
Tek 549 1a4 2.jpg
549_Delayed_Trace.jpg           | B INTEN BY A Trig in 549
Tek 549 1a4 3.jpg
549_Dual_Trace.jpg               | Dual trace display in 549
Tek 549 1a4 4.jpg
Tek 549-1 knob layout.jpg       | 549 knob layout
549_Delayed_Trace.jpg|B INTEN BY A Trig in 549
Tek 549 - Electronics 1965-08-23.jpg | 549 ad in Electronics 1965-08-23
549_Vertical_OP.jpg|8608 Vertical Output Tubes of 549
Tek 549 vertamp on.jpg|8608 Vertical Output Tubes of 549
549_Dual_Trace.jpg|Dual Trace in 549
549_Tubes_ON1.jpg|549 LV Power Supply Tubes
549_Tubes_ON.jpg| 549 LV Power Supply Tubes
Tek_549-Rempte-2.jpg | 549 Remote Control For Storage Control
Tek_549-Remote-1.jpg | 549 Remote Control Rear
Tek_549_Storage_Board.jpg | Storage Board (Recapped)- Rev "PC"
Tek_549-storage_board_Rev_PE.JPG | Storage Board Rev "PE"
</gallery>
</gallery>
===Internal===
<gallery>
Tek_549-LHS.jpeg                | LHS
Tek_549-RHS.jpeg                | RHS
Tek_549-RHS-Timebase.jpeg        | RHS Timebase Ch: Door Open
Tek_549-Top.jpeg                | Top
Tek_549-Under.jpeg              | Underside
Tek_549-V-Amp.jpeg              | 8608 vertical output tubes
549_vert_amp.jpg                | Vertical amp
549_Vertical_OP.jpg              | 8608 vertical output tubes
Tek 549 vertamp on.jpg          | 8608 vertical output tubes
549 v out.jpg
549_top.jpg                      | Top view
549_storage_board.jpg            | Storage board
549_inside_door.jpg              | Power supply behind door
Wellenkino_549-8.jpg            | Right side internal
Wellenkino 549-7.jpg            |
Wellenkino 549-6.jpg            |
Tek_549-Prim-Sel-Sw.jpeg        | Primary voltage range selector
549_Tubes_ON1.jpg                | LV power supply tubes
549_Tubes_ON.jpg                | LV power supply tubes
Tek_549_Storage_Board.jpg        | Storage board Rev "PC" (recapped)
Tek_549-storage_board_Rev_PE.JPG | Storage board Rev "PE"
</gallery>
===HT Transformer modification===
<gallery>
564 HV Transformer installed in the 549.jpeg  | 564 HV transformer installed in the 549
Schematic of HT transformer modifications.jpeg | Schematic showing other changes required
</gallery>
==Components==
{{Parts|549}}




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[[Category:Introduced in 1966]]
[[Category:Introduced in 1966]]
[[Category:Analog storage scopes]]
[[Category:Analog storage scopes]]
 
Retrieved from "https://w140.com/tekwiki/wiki/Special:MobileDiff/36751...90629"