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Re: Tektronix 585A Voltage Diagnoses Problem edited
Roy Morgan
I no longer have my 585 or a manual, but I am pretty sure that all the other B+ voltages depend on the -150 supply. I suggest you focus on that one - you may find that all the others come to correct voltage if that one is right. I suggest you read the 585 manual section about the B+ supplies.
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“Typical OscilloscopeCircuitry” confirms this on pg 12-22. Fig 12-16 shows the supply for the 531A and 545A. The 585 supply is likely very similar. Your report below about the -150 volt adjustment pot having no effect is the smoking gun!! There are 4 capacitors .01 uF in the 531/545 supply shown. If ANY of them is a “black beauty” cap, replace them ALL. Check for reasonable voltages on all 3 terminals of that adjustment pot. Note: the calibration of the entire scope depends on the -150 and the others to be right. I assume you can rely on your voltmeter to be right. Roy sends. On Aug 23, 2019, at 6:43 PM, randolphbeebe@... wrote: |
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WTB - Tektronix P6406 Word Recognizer Probe
I am restoring a pair of Tektronix 338 and 308 logic analyzers. I've managed to find all of the probes except for the P6406 Word Recognizer for the 308, so here I am...
If anyone has a working or non-working P6406 available for sale, please contact me OFF LIST via K7WXW at pdx dot org. Thanks, Bill |
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Re: 11801C and the T1331 error: lost factory TB calibration data.
Hi Leo,
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The S-4 and S-6 were designed by George Fry. They were a radical departure from the previous, much slower sampling heads. I once asked George why they were faster and he said it was because he saw the problem in terms of a wave front moving through the sampling gates. George is alive and well. He sells custom hearing aids in the Portland area. A few years ago I visited Agoston Agoston in Beaverton. I'm not sure when he left Tek but I don't believe he designed the newer heads for the 11K series. Right after he left Tek he formed HyperLabs and produced a series of sampling plugins that are the same form factor as the S series plugins. That's why I don't think he ever designed anything for the 11K series. His S series heads had better specs than the Tek heads. Here are the plugins HyperLabs made: HL-11 100 pS 50? BNC SAMPLING HEAD HL-12 100 pS 10 K? BNC SAMPLING HEAD HL-13 20 pS 50?, K (SMA), SAMPLING HEAD HL-14 <35 pS 50?, K (SMA), TDR HEAD HL-15 25 pS PHOTONICS HEAD HL-16 25 pS, 50?, K (SMA), PULSE GENERATOR HEAD Hyperlabs is still in business. You can read about what they are up to at I have datasheets somewhere for each of these sampling heads but I never saw a price list so I have no idea how much they sold for. In 20 years searching for them on eBay I have never come across any of them. When I was at his house we did not discuss the sampling heads. His company is now making TDR based systems that test and characterize the performance of extremely fast cables. His wife worked at Tek at the time of my visit. Dennis Tillman W7PF -----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Leo Bodnar Sent: Saturday, August 24, 2019 3:47 PM On Sat, Aug 24, 2019 at 05:06 PM, Reginald Beardsley wrote: I'd love to know who designed it and whether they are still alive.I think most heads were designed by Agoston Agoston. Other than that: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ This product was made possible by the dedicated efforts of a group of inspired, tireless, and often times ingenious individuals of the design team. The following is a list of a few of the cast of many that contributed to the development of this oscilloscope. Design Team: Mark Anderson Brian Colony John DeLacy Rob DeVoe Jim Edwards Larry Hattery Tim Holte Roy Kaufman Jim Lamb Les Larson Chan Lee Jim Long Ben McCarroll Clark Morgan Jim Peterson Jim Schlegel Bob Simpson Ken Smith David White Wayne Wilburn Contributing Engineers: Ray Blohm Thomas Dye Scott Halsted Ron Henricksen Steve Herring Bev Kramlich Mehrab Sedeh Jim Stanley Gil Stephens Engineering Support: Bob Chandler Hilde Cochran John Eskeldson Pam Fodrea Lorna Goedel Dick Griffin John Hazard Diane Kemper Beverly McClenathan Jerry Sternes Wally Sutton Pat Wiley Manuals: Brian Diehm Amy Farrell Susan Grace Julie Leonetti Krystn McCaleb Chuck Melikian Roland Parenteau David Powe Mark Stade Carolyn Strong Manufacturing: Tim Bennington-Davis Donna Brown Jerry Brucken Kevin Cosgrove Lew Cummings Jeanne Eick Jerry Feickert Berdine Garner Clark Jarvis Paulette Jesse Murlan Kaufman Phil Lloyd Woody Ngincharoen Tina Noll Howard Nutt Carol Parks Al Phillips Steve Ratner Doug Rowe Bill Schell Colleen Swanson Mark Swenson Ron Tegner Rod Van Loon Walt Ventgen Marketing/Service: Denny Chamberlin Roger Ensrud Tom Freeman Theresa Graf Ivan Jackson Dennis Kucera Paul Kristof Ray Blohm John Boatwright Betty Bonham Bob Bousquet Jim Carter Dennis Chamberlin Jo Chi John Cooper Jerry Coulter Connie DeClerck Laszlo Dobos Tom Dye Brad Figg Dean Gehnert Ted Gerlinger Larry Hershiser Ken Holland Will Hott Shirley Humphreys David Irwin Stan Kaveckis Ray Kazlauskas Hedy Leidelmeyer Roy Lewallen Ken Longgrear Tina Newkirk Reba Norris Oris Nussbaum Mike O'Shanecy Janet Peters Barbara Ports V. Prasannan Mary Rehse John Rettig Glen Rollins Ava Stupek Dan Taylor Erik Teose Mark Tilden Jan Todd Harold Vandecoevering Mona Webber Vaughn Weidel Bob Windham -- Dennis Tillman W7PF TekScopes Moderator |
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Re: 11801C and the T1331 error: lost factory TB calibration data.
Wow!!! Leo, where did you find that information? Does anyone reading this know if any of them might have some schematics in a box some where? I'd really like to prevent these from all dying off for lack of repair data. And if you've worked around a packrat, you know who they are. So if someone recognizes the name of a packrat they worked with who might still be around, please drop me a private email.
I have been having a blast with my SD-24. Being able to see the SMA-F to SMA-M connection separately from the N-F to N-M connection on an adapter which is ~32 mm long is incredible. I could sort of manage it using the calibrator output and a tee, but the mismatch produced by parallel 50 ohm loads at the tee obscured things. Lots of reflections in the SMA tee to sort out. It's especially fun for me coming from reflection seismology because I'm so used to interpreting time domain data in the frequency domain by inspection. I'm still getting used to having complex reflection coefficients instead of the pure real coefficients of elasticity, but the wave equation is still the same and transmission lines are *much* simpler than 3D. All I need now is an SD-32 at a sensible price. The jitter I'm referring to is video system jitter. It makes me very nervous not having any data for it. Can it be repaired without data? Sure, but that's a long slog even with very simple gear. And these are anything but simple. BTW To return to the thread topic, has anyone investigated substituting a GPSDO for the timebase clock? It would seem to me that one of Leo's units would completely obviate the T1331 issue. But the errors might be gate and divider delays in which case it would be device specific. However, in that case I'd question whether they would be the same after 30 years. Have Fun! Reg |
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Tektronix 585A Voltage Diagnoses Problem edited
Hello All,
I have a 585A scope that has me stumped.. the LV voltages are out of spec and I cannot find the problem. Here are the voltage readings; -150 = -182 -100 = -115 225 = 263 350 = 409 500 = 587 The -150v adjustment pot does not change the voltage value at all. All the tubes were pulled and tested for shorts and emission. Not being very good at diagnosis I shotgunned all the electrolytics and filter caps although most of the tested good in circuit I found a couple of bad ones. No improvement. I have the schematic and can upload that if it helps. Can anyone suggest a way I can isolate the circuit causing me grief? The scope is clean and intact otherwise. Thanks in advance. |
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Re: 577 D1
Chuck Harris
Exceedingly so.
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You need to do the calibration sequence for the storage section. -Chuck Harris DW wrote: I recently recapped the power supply of the 577 and only had to slightly adjust +30 -30V, when I went to use the D1 storage option the screen doesn't show a faint green background or store the trace at all. Perhaps the D1 storage is picky about the voltages as it worked before, any thoughts? Thanks |
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Re: 11801C and the T1331 error: lost factory TB calibration data.
On Sat, Aug 24, 2019 at 05:06 PM, Reginald Beardsley wrote:
I'd love to know who designed it and whether they are still alive.I think most heads were designed by Agoston Agoston. Other than that: ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ This product was made possible by the dedicated efforts of a group of inspired, tireless, and often times ingenious individuals of the design team. The following is a list of a few of the cast of many that contributed to the development of this oscilloscope. Design Team: Mark Anderson Brian Colony John DeLacy Rob DeVoe Jim Edwards Larry Hattery Tim Holte Roy Kaufman Jim Lamb Les Larson Chan Lee Jim Long Ben McCarroll Clark Morgan Jim Peterson Jim Schlegel Bob Simpson Ken Smith David White Wayne Wilburn Contributing Engineers: Ray Blohm Thomas Dye Scott Halsted Ron Henricksen Steve Herring Bev Kramlich Mehrab Sedeh Jim Stanley Gil Stephens Engineering Support: Bob Chandler Hilde Cochran John Eskeldson Pam Fodrea Lorna Goedel Dick Griffin John Hazard Diane Kemper Beverly McClenathan Jerry Sternes Wally Sutton Pat Wiley Manuals: Brian Diehm Amy Farrell Susan Grace Julie Leonetti Krystn McCaleb Chuck Melikian Roland Parenteau David Powe Mark Stade Carolyn Strong Manufacturing: Tim Bennington-Davis Donna Brown Jerry Brucken Kevin Cosgrove Lew Cummings Jeanne Eick Jerry Feickert Berdine Garner Clark Jarvis Paulette Jesse Murlan Kaufman Phil Lloyd Woody Ngincharoen Tina Noll Howard Nutt Carol Parks Al Phillips Steve Ratner Doug Rowe Bill Schell Colleen Swanson Mark Swenson Ron Tegner Rod Van Loon Walt Ventgen Marketing/Service: Denny Chamberlin Roger Ensrud Tom Freeman Theresa Graf Ivan Jackson Dennis Kucera Paul Kristof Ray Blohm John Boatwright Betty Bonham Bob Bousquet Jim Carter Dennis Chamberlin Jo Chi John Cooper Jerry Coulter Connie DeClerck Laszlo Dobos Tom Dye Brad Figg Dean Gehnert Ted Gerlinger Larry Hershiser Ken Holland Will Hott Shirley Humphreys David Irwin Stan Kaveckis Ray Kazlauskas Hedy Leidelmeyer Roy Lewallen Ken Longgrear Tina Newkirk Reba Norris Oris Nussbaum Mike O'Shanecy Janet Peters Barbara Ports V. Prasannan Mary Rehse John Rettig Glen Rollins Ava Stupek Dan Taylor Erik Teose Mark Tilden Jan Todd Harold Vandecoevering Mona Webber Vaughn Weidel Bob Windham |
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What to do on a lazy summer day near the end of August
Well summer is rapidly passing me by and here I am sitting watching Netflix while my wife makes a pie. Wondering what to do. I have an original 535 in the garage with no tubes and a messed up AC input. I am wondering if I should drag it upstairs to my workroom and see if I can get at least some of it working. Just retubing it will take me most of the rest of the day by the time I find and test all the needed tubes. What do you think. Does this make sense? I need to either fix it or get rid of it.
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577 D1
I recently recapped the power supply of the 577 and only had to slightly adjust +30 -30V, when I went to use the D1 storage option the screen doesn't show a faint green background or store the trace at all. Perhaps the D1 storage is picky about the voltages as it worked before, any thoughts? Thanks
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For Sale - 2465BDM with lots of extras
Thinning out my collection so l’m offering an excellent operating and cosmetic condition 2465BDM scope for sale. A5 board has new SMD caps (no leakage damage) and a new socketed NVRAM module. Original calibration constants were saved from the old NVRAM module and reprogrammed into the new one. Power supply has all new electrolytic and HV film capacitors. Has option 1E (external frequency input) factory installed. Serial number B06xxxx and includes
Front cover Probe pouch Ground binding post Clear and blue filters Viewing hood Trigger probe Temperature probe DMM probes 2 x P6137 400 MHz probes Original operators manual Original service manual Original options service manual Price is $1050 plus actual shipping cost. US sale only at this time. Manuel |
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Re: Tek 576 Curve Tracer HV Transformer winding
I have two 576, if you told me which test you need to compare, I will do it with mine. Do you know ferrite core specs? Could be changed some transformer HV turns for a voltage multiplier?
FERRITE CORE E 20 N27 Core Type : E Core Size : E20/10/6 Core Material Grade : N27 For Use With : - Effective Magnetic Path Length : 46.3mm Ae Effective Cross Section Area : 32.1mm? Inductance Factor Al : 1.3?H Product Range : B66311 Series SVHC : No SVHC (15-Jun-2015) Accessory Type : Ferrite Core Material Grade : N27 -----Mensaje original----- De: [email protected] [mailto:[email protected]] En nombre de peter bunge Enviado el: sábado, 24 de agosto de 2019 16:08 Para: [email protected] Asunto: Re: [TekScopes] Tek 576 Curve Tracer HV Transformer winding Thanks David for your generous offer; Where do they get the cores to make a compatible transformer that works in the 576 circuit. This is not a 115v 60 Hz transformer. A friend suggested a plate transformer and doublers or triplers. 225v is also needed. I have been looking at using a 4 kV and 225 V switching power supplies from China and I have used some for other projects. They tend to be noisy but can be cleaned up. Since my 576 is still working there is no great urgency. I also want to look at my friend's 577 and compare it to my 576. His is smaller and lighter but may not do as much. My 576 does weird things at lower currents (all loops) and PNP do not seem to work the same as NPN (lack of steps) so the transformer is not the only issue. I spent a couple of days working on it a few years ago but could not improve it. I need to find someone with a 576 and compare traces to see if mine is "normal". I need the 1500v capability which rules out some of the newer ones which are also more expensive. I will think about your offer. Peter On Fri, Aug 23, 2019 at 4:28 PM drawding@... <drawding@...> wrote: Yes. David Rawding is still here. |
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Re: P6139a with broken tip
Hi,
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Well, that is what I have and will continue to use ’till I win the lottery; since I don’t play…' larry On Aug 24, 2019, at 2:39 PM, Raymond Domp Frank <hewpatek@...> wrote: |
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Re: P6139a with broken tip
On Sat, Aug 24, 2019 at 04:12 PM, Lawrance A. Schneider wrote:
The P6139A was designed for the 500 MHz TDS-series (TDS500 e.a.). The P6137 was designed for the 2465B. Raymond |
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Re: 11801C and the T1331 error: lost factory TB calibration data.
I plan to browse chipxs regularly. This is hardly an NOS SD-24. Last cal was 2011 due next in 2013. Measured rise times are ~14 ps with uncertainties of 4 ps. I am extremely pleased with it.
I did some calculations this morning. With an adjustable shorted stub on a 0.0001" reading micrometer head, the reflection would shift ~25 femtoseconds for each 0.0001" movement. At 5 ps/div and 5120 samples we've got samples at ~10 femtosecond intervals. So measuring timebase nonlinearity is rather challenging. I don't think any piece of gear I have has been as just plain amazing. The idea that it is 30 year old technology blows me away. I just wish I had better service data for it. I'm quite alarmed that after being idle for a few months I now have display jitter even after warming up for several hours. I'd love to know who designed it and whether they are still alive. |
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Re: P6139a with broken tip
Bob Koller
The 2465B originally shipped with P6137 probes. They too are difficult to find in good condition, and at a good price.
Many cheap probes will work, how important is signal fidelity to the user? Tek probes were very carefully designed for the vertical system of the specific instrument. |
bill K7WXW
John Williams
Raymond Domp Frank
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