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549: Difference between revisions
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{{Oscilloscope Sidebar |manufacturer=Tektronix | | {{Oscilloscope Sidebar | ||
model= 549 | | |manufacturer=Tektronix | ||
summary=30 MHz storage | |series=500-series scopes | ||
image=Tek-549 and d.jpg | | |model=549 | ||
caption=Tektronix 549 front | | |summary=30 MHz storage oscilloscope | ||
introduced=1965 | | |image=Tek-549 and d.jpg | ||
discontinued=1974 | | |caption=Tektronix 549 front | ||
manuals= | |introduced=1965 | ||
* [[Media:070-0508-00.pdf|549 | |discontinued=1974 | ||
* [ | |designers=Mel Holznagel;Bob Shand; | ||
* [ | |manuals= | ||
* [[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==== | ====Maintenance Notes==== | ||
* [[Media:tek_549_crt_socket_leak.pdf|Maintenance Note: 549 CRT Socket Leakage ( | * [[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 ( | * [[Media:tek_549_note_ringing_1a1.pdf|Maintenance Note: 549 Ringing with 1A1]] (OCR) | ||
====Data Sheets and Catalogs==== | ====Data Sheets and Catalogs==== | ||
* [[Media:tek_549_catalog.pdf|Tektronix 549 in 1968 Catalog ( | * [[Media:tek_549_catalog.pdf|Tektronix 549 in 1968 Catalog]] (OCR) | ||
* [[Media:tek_549_german_intro.pdf|Tektronix 549 Introduction in German ( | * [[Media:tek_549_german_intro.pdf|Tektronix 549 Introduction in German]] (OCR) | ||
* [[Media:tek_549_Remote_Control_DS.pdf|Tektronix 549 Remote Control Datasheet ( | * [[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 | 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 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 | 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 | {{Spec | Size | 43.2 cm × 32.9 cm × 60.7 cm (W/L/H, 13" × 24" × 17") }} | ||
{{Spec | Weight | {{Spec | Weight | 31 kg (68 lb) }} | ||
{{Spec | Cooling | AC Fan }} | {{Spec | Cooling | AC Fan }} | ||
{{Spec | | {{Spec | Accessories | [[012-0102-00|012-0102-00 remote control cable/switch]] }} | ||
{{EndSpecs}} | {{EndSpecs}} | ||
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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. | ||
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 | 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 scope (see [[549 remote control connector]] for pin-out). | |||
===Power Supply=== | ===Power Supply=== | ||
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The 549 uses a [[120-0423-00]] HV transformer driven by a [[6GF5]] tube from +470 V. | 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== | ||
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* [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== | ||
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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-front.jpg | |||
Tek 549 trace2.jpg | | Tek 549 trace2.jpg | | ||
Tek_549-Front.jpeg | | Tek_549-Front.jpeg | | ||
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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 | Tek 549-1 knob layout.jpg | 549 knob layout | ||
Tek 549 - Electronics 1965-08-23.jpg | 549 ad in Electronics 1965-08-23 | |||
Tek | |||
</gallery> | </gallery> | ||
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Tek_549-storage_board_Rev_PE.JPG | Storage board Rev "PE" | Tek_549-storage_board_Rev_PE.JPG | Storage board Rev "PE" | ||
</gallery> | </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}} | |||