549: Difference between revisions

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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                |
Line 128: Line 114:
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
Line 153: Line 149:
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]]
 

Revision as of 06:12, 15 September 2020

{{{manufacturer}}} 
30 MHz storage scope
Tektronix 549 front

Produced from 1965 to 1974

Manuals
Manuals – Specifications – Links – Pictures

The Tektronix 549 is the only storage scope in the 500 series (except for the 537 that never left prototype stage).

It takes a letter-series or 1-series vertical plug-in. The 549 was introduced in 1966 and discontinued after 1973.

Key Specifications

Bandwidth DC to 30 MHz (−3 dB) with fast plug-ins (1A1, 1A2, 1A4, 1A5)
Rise time 12 ns
Writing speed 5 cm/μs
Line voltage 104/115/127 or 208/230/254 VAC ±10%, selected via primary voltage selector (inside cabinet) and voltage range selector (on rear panel), 50 to 60 Hz
Thermal protection 65°C (150°F) Automatic resetting thermal cutoff
Power consumption 650 W, 750 VA
Size 43.2 cm × 32.9 cm × 60.7 cm (W/L/H, 13" × 24" × 17")
Weight 31 kg (68 lb)
Cooling AC Fan
Construction Aluminum alloy chassis, anodized front panel, blue vinyl coated cabinet

Internals

Mix of Transistors and Tubes

Like many Tek scopes from the period, the 549 uses a mix of transistors and tubes. For example, consider the buffer amplifier in the 549, whose purpose is to interface the high-impedance output of the plug-in with the low-impedance of the 200 ns delay line in the 549. As is usual in oscilloscope vertical circuits, the requirement is to have flat frequency response from DC to the maximum frequency of the scope and to have linear phase response over this same frequency range.

In the 549, this buffer is implemented with a 6DJ8 cathode follower at the plug-in interface driving an NPN BJT differential amplifier at the bottom of a cascode with a 7119 tube on top. The output of the cascode (the plate of the 7119) drives the delay line.

Since the entire signal path is differential, the common-mode voltage does not have to be zero, and it is not; 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 on the bottom and a pair of 10-watt 8608 power pentodes on the top whose plates drive the CRT's vertical deflection plates of the CRT through inductive matching/peaking networks.

Non-Distributed Amplifier

The 549 is slightly unusual among 54x-series scopes in that it does not use a distributed vertical amplifier. (Other exceptions include the 545B and 547).

Triggering

Triggering is done using an NPN BJT Schmitt trigger.

Storage

The 549 uses the T5490 CRT which has two storage targets, upper and lower, 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 Amphenol 165-16 socket at the rear top of the scope (see 549 remote control connector for pin-out).

Power Supply

The 549's power supply provides regulated outputs of −12.4 V, −150 V, +100 V, +225 V, +300 V, +350 V, and +500 V as well as a +475 V unregulated output.

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. 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.

Most other stages replicate the same design, except slight changes in tubes used − the +350 V, +225 V and +100 V regulators employ a 6080 as the pass element.

The −12.4 V regulator is transistor-based.

The 549 power supply uses a 6N030 delay relay (P/N 148-0021-00) to control a relay that switches supply voltages on only after the tubes are warmed up. On power up, only heater voltage is applied to the tubes. After a delay of up to 60 seconds, the thermal delay relay activates the main relay (driven from unregulated +170 V). This also cuts out the delay relay, which can cool down and will be ready to delay again even after a quick interrupt in power input.

The 549 has a 65°C (150°F) thermal cutoff.

The 549 uses a 120-0423-00 HV transformer driven by a 6GF5 tube from +470 V.

Links

Pictures

Remote Control

Internal