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549: Difference between revisions
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|model=549 | |model=549 | ||
|summary=30 MHz storage oscilloscope | |summary=30 MHz storage oscilloscope | ||
|image=Tek-549 | |image=Tek-549-front.jpg | ||
|caption=Tektronix 549 front | |caption=Tektronix 549 front | ||
|introduced=1965 | |introduced=1965 | ||
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|manuals= | |manuals= | ||
* [[Media:070-0508-00.pdf | Tektronix 549 Manual]] (OCR) | * [[Media:070-0508-00.pdf | Tektronix 549 Manual]] (OCR) | ||
'''Maintenance Notes''' | |||
* [[Media:tek_549_crt_socket_leak.pdf|Maintenance Note: 549 CRT Socket Leakage]] (OCR) | * [[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) | * [[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_catalog.pdf|Tektronix 549 in 1968 Catalog]] (OCR) | ||
* [[Media:tek_549_german_intro.pdf|Tektronix 549 Introduction in German]] (OCR) | * [[Media:tek_549_german_intro.pdf|Tektronix 549 Introduction in German]] (OCR) | ||
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{{Spec | Accessories | [[012-0102-00|012-0102-00 remote control cable/switch]] }} | {{Spec | Accessories | [[012-0102-00|012-0102-00 remote control cable/switch]] }} | ||
{{EndSpecs}} | {{EndSpecs}} | ||
==Links== | |||
* [https://lazyelectrons.wordpress.com/2018/01/11/tektronix-549-restoration/ Rajesh's Tek 549 Restoration] / [https://www.youtube.com/watch?v=8rWH-uuf60U Video] | |||
* [https://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] | |||
* [https://www.youtube.com/watch?v=D6szONQe1go&t=6s Deon's 549 with 564 HT Transformer] | |||
{{Documents|Link=549}} | |||
{{PatentLinks|549}} | |||
==Internals== | ==Internals== | ||
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===HV Transformer Problem and Replacement=== | ===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. | 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. | ||
==Pictures== | ==Pictures== | ||