549: Difference between revisions

3,690 bytes added ,  31 January
no edit summary
(Power Supply Description)
No edit summary
(64 intermediate revisions by 7 users not shown)
Line 1: Line 1:
{{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)
* [https://w140.com/mmm/tek-549.pdf Tektronix 549 Manual]
* [https://bama.edebris.com/manuals/tek/549 Tektronix 549 Manual] @ BAMA
 
====Maintenance Notes====
* [[Media:tek_549_crt_socket_leak.pdf|Maintenance Note: 549 CRT Socket Leakage]] (OCR)
* [[Media:tek_549_note_ringing_1a1.pdf|Maintenance Note: 549 Ringing with 1A1]] (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]]
The '''Tektronix 549''' is the only [[CRT_storage_scope|storage scope]] in the 500 series (except for the [[537]] that never left prototype stage).
that 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 1965]] and discontinued after 1973.   


It was [[introduced in 1966]] and discontinued after 1973.   
The 549 vertical output stage was designed by [[Mel Holznagel]].  [[Bob Shand]] did the mechanical design.


{{BeginSpecs}}
{{BeginSpecs}}
{{Spec | Bandwidth | DC to 30 MHz (at -3 dB Point), depending on vertical plug-in  }}
{{Spec | Bandwidth | DC to 30 MHz (−3 dB) with fast plug-ins ([[1A1]], [[1A2]], [[1A4]], [[1A5]]) }}
{{Spec | Rise time | 12 ns }}
{{Spec | Rise time | 12 ns }}
{{Spec | Deflection Factor | 100 mV/Div }}
{{Spec | Writing speed | 5 cm/μs }}
{{Spec | Line Voltage | 104/115/127/208/230 VAC ±10%,selected via primary voltage selector and voltage range selector Switches, 50 Hz 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 | Automatic resetting thermal cutout, in case internal temperature exceeds safe operating level }}
{{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  | 13W x 24L x 17H Inches or 43.2W x 32.9L x 60.7L cm}}
{{Spec | Size     | 43.2 cm × 32.9 cm × 60.7 cm (W/L/H, 13" × 24" × 17")  }}
{{Spec | Weight | 68 lb or 31Kg }}
{{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}}


Line 40: Line 52:
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 on the bottom and [[8608]] tubes on the top.   


The vertical deflection plates of the CRT are driven by the plates of an [[8608]]  
After the delay line, the signal enters another cascoded differential amplifier with NPN BJTs
10-watt power pentode through inductive matching/peaking networks.
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===   
===Non-Distributed Amplifier===   
Line 64: Line 72:


===Storage===
===Storage===
The 549 uses the [[T5490]] CRT.
The 549 uses the [[T5490]] CRT which has two storage targets, upper and lower,
whose storage mode and erase signals can be controlled independently.
 
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.
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).


The screen has two storage targets, upper and lower,
===Power Supply===
whose storage mode and erase signals can be controlled independently.
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.
There is a remote control cable/switch,
part number 012-0102-00 (photo below), that can erase the screen and reset the single sweep.
===Low Voltage Power Supply===
549 Low Voltage Power Supply provides voltage for all the stages and heater voltage. It provides DC -12.4V, -150V, +100V, +225V, +300V, +350V, +500 regulated output and +475V Unregulated output.


Line input is connected to main transformer primary via two switches, one to select 110/230V Range - (which is inside the chassis) and another switch (on the rear of the chassis) to select Low/Medium/High voltage range in both the above line voltage class.
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.  


The design regulates one power rail (of -150V in this case) and refer all other voltage rails to this output to keep all voltages stable.
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 dividersOnly 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.
This enables adjusting all rail voltages with one Trim resistor/Potentiometer.
   
5651 VR Tube is used as the reference for -150V, 12AX7 is used as the Comparator, 3 Nos of 12B4 are used as series regulator tubes. 6AU6 is used as error amplifier.


Most other stages replicate the same design, except slight changes in Tubes used,6080 Tube is used as series regulator for +350V, +225V and +100V
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 -12.4V rail is all transistor regulator.
The −12.4 V regulator is transistor-based.


A thermal delay tube which controls a relay is used to delay the plate voltages to the Tubes till they are warmed up. On power up, only heater voltage is applied to the tubes, which also drives the thermal delay tube. After a time delay of up to 60 seconds, the thermal delay tube activates the relay, powering all outputs ON. Unregulated +100V is used to drive this relay.
The 549 power supply uses a [[delay relay|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 circuit is designed such that Thermal delay tube cut itself off the circuit once it turns the relay and outputs on, but holding the relay on.
The 549 has a 65°C (150°F) [[thermal cutoff]].
This allows the thermal delay tube to cool down and allow heater warmup time even after a quick interrupt in power input.


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
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
</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}}




Line 133: Line 170:
[[Category:Introduced in 1966]]
[[Category:Introduced in 1966]]
[[Category:Analog storage scopes]]
[[Category:Analog storage scopes]]