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549 (view source)

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discontinued=1974 |
discontinued=1974 |
manuals=
manuals=
* [[Media:070-0508-00.pdf|549 Instruction]] (PDF)
* [[Media:070-0508-00.pdf|549 Instruction]] (OCR PDF, 22M)
* [http://w140.com/mmm/tek-549.pdf Tektronix 549 Manual (PDF)]
* [http://w140.com/mmm/tek-549.pdf 549 Instruction (PDF, 162M)]
* [http://bama.edebris.com/manuals/tek/549 549 manual on BAMA ]
* [http://bama.edebris.com/manuals/tek/549 549 Instruction @ BAMA (PDF, 27M)]


====Maintenance Notes====
====Maintenance Notes====
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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]].   


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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.
 
==Repair issues==
549 from  Portland factory  uses ONE black paper-capacitor  from Areovox. Capacitor with 0.5 µF 600 V rating is using in horizontal amplifier.  Result: compressing  trace on right side. 
Solution:  Replacing him with ordinary 0.47 µF 630V(and above) capacitor.  Their location is upper chassis, middle.
 
Ironcally, dutch made 549 have never this problem.
 
 
<gallery>
549badtrace.jpg | compressing trace on right side
549-areovox.png | Result of bad ROM by verification-check.
</gallery>
 


==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]
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Tek-549 and d.jpg                | 549 front, earlier round bezel
Tek-549 and d.jpg                | 549 front, earlier round bezel
Tek 549 mt1.jpg                  | 549 front, later rectangular bezel
Tek 549 mt1.jpg                  | 549 front, later rectangular bezel
Tek 549 trace2.jpg              |
Tek 549 trace2.jpg              |  
Tek_549-Front.jpeg              |
Tek_549-Stroage-Ctrl.jpeg        | 549 Storage controls
Tek 549 trace2..jpg              |
Tek 549 trace2..jpg              |
Tek 549 trace.jpg                |
Tek 549 trace.jpg                |
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Tek 549 1a4 1.jpg                |
Tek 549 1a4 1.jpg                |
Tek 549 1a4 2.jpg                |
Tek 549 1a4 2.jpg                |
Tek_549-Rear.jpeg                | 549 Rear 
Tek_549-Line-Range.jpeg          | Line voltage selector           
Tek 549 1a4 3.jpg                |
Tek 549 1a4 3.jpg                |
Tek 549 1a4 4.jpg                |
Tek 549 1a4 4.jpg                |
549_Delayed_Trace.jpg            | B INTEN BY A Trig in 549
549_Delayed_Trace.jpg            | B INTEN BY A Trig in 549
549_Dual_Trace.jpg              | Dual trace display in 549
549_Dual_Trace.jpg              | Dual trace display in 549
Tek 549-1 knob layout.jpg|549 knob layout
</gallery>
</gallery>


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===Internal===
===Internal===
<gallery>
<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_vert_amp.jpg                | Vertical amp
549_Vertical_OP.jpg              | 8608 vertical output tubes
549_Vertical_OP.jpg              | 8608 vertical output tubes
Tek 549 vertamp on.jpg          | 8608 vertical output tubes
Tek 549 vertamp on.jpg          | 8608 vertical output tubes
549 v out.jpg
549_top.jpg                      | Top view
549_top.jpg                      | Top view
549_storage_board.jpg            | Storage board
549_storage_board.jpg            | Storage board
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Wellenkino 549-7.jpg            |
Wellenkino 549-7.jpg            |
Wellenkino 549-6.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_ON1.jpg                | LV power supply tubes  
549_Tubes_ON.jpg                | LV power supply tubes
549_Tubes_ON.jpg                | LV power supply tubes
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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/44479...57291"

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