Re: Tek 576 Curve Tracer HV Transformer winding
I apologize if I jumped to conclusions. I would have to go back and search the threads to find it. Perhaps next week I can.
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Re: What to do on a lazy summer day near the end of August
Hi John, Just $.02 from the peanut gallery.. Totally worth it if you ask me. I even uploaded some encouragement for you: /g/TekScopes/album?id=94563I just rebuilt a new-to-me as of a few months ago 535A and had to buy most of the tubes to go into it. The B plugin needed a lot of TLC too. All new caps (well, almost - there's a couple of the bumble-bees lurking on the least accessible rotary switches and I haven't got the gumption to go in and replace those yet), almost all new tubes, calibration (I'm not quite happy with my geometry and delay line yet, but I'm close on both) and I use the old beast in my other hobby - tube audio. It is a rather daunting task at first, but doing a little here and there, it's surprising how it doesn't take that long and just how bright, sharp and usable the displays are. So long as you don't need a device that is super fast, they can still make remarkable companions. Plus with winter around the corner, an extra space heater for your workroom may not hurt your feelings either. Lastly, you get the feeling of satisfaction of keeping a genuinely awesome piece of functional engineering going. Where do you see this kind of quality that is this well thought out nowadays? Sure the newer ones may have more bells and whistles, but I can't help but notice how well even the old tube-based triggers just seem so much less fiddly and quick to lock onto what I'm after than the horizontal plugins for my 5113 (5B10N/5B12N), 7834 (7B85/7B80/7B92), and my TAS465. Don't get me wrong, those are fine instruments and I can extract more from them, but for quickly assessing things, my 503 and 535A are just a pleasure to use and aid me in how I want to set up the newer siblings. For what it is worth, I'm just beginning the restoration on my 547. The A trigger is barely functional (I'm not far enough in to even know whether I should suspect the tunnel diode or something else yet), the geometry is definitely needing help, lots of capacitors to replace, although I have replaced most of the tubes in it already. On the upside, the B trigger is strong and time-base seems pretty close, the HV transformer seems fine so far and it is overall in pretty good shape. But again, it will be a half-hour here, an hour or so there and hopefully in a couple months, it will be working alright as well. But all this could just be me and my affliction.. sorry affection for old Tek gear. :-) Jason
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Re: Tek P6xxx probe reference question
What sort of irks me a bit is when Tek refers to an accessory for a x.xmm probe but, yet does not reference that to what probes are covered. Then you look at the probe data sheets and most of the time they do not mention the referenced dimension. So it's then time for a call to the manufacturer.
Greg
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Re: Tek P6xxx probe reference question
On 8/24/19 8:23 PM, Greg Muir via Groups.Io wrote: From a little more digging it appears that the measurement Tek uses applies to the diameter of the metal part of the probe tip body itself; sort of a mystery since Tek does not indicate what they are referring to in any of their literature. It's a planned obsolescence thing. Mentioning that the tip male prong and barrel on the body of the probe are well known standards might reduce sales. Most companies in test equipment know that they make plenty from selling accessories. 5mm barrel and 2.5mm barrel on probe tips are a pseudo standard with Tek and it allows any low frequency parts to swap out or substitute willy nilly. I like some thin small probes by HP such as 10017A probes. Their probe tip barrel diameter is 2.33mm, not standard with Tek at all, and not even a perfect input capacitance match, but I use them up to 20 MHz with no big troubles. For higher frequencies, the probe for the scope will be better. An example of how 5mm probe tip barrel diameters allow swapping things is those funny elephant trunk-looking tips for the P6046 diff probes, and also the nifty shorting tips that come with those probes for performance checks and cal.
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Re: Tek P6xxx probe reference question
I think I have managed to better understand what Tek is doing here, From a little more digging it appears that the measurement Tek uses applies to the diameter of the metal part of the probe tip body itself; sort of a mystery since Tek does not indicate what they are referring to in any of their literature.
Greg
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Re: Tek 576 Curve Tracer HV Transformer winding
Thanks Miguel; my 576 just quit again. It has a dot floating near the top
left. Another bad connection. I will check it tomorrow.
Peter.
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On Sat, Aug 24, 2019 at 3:11 PM Miguel Work <harrimansat@...> wrote: 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: s¨¢bado, 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.
: )
I bought five professionally made transformers. One was donated to
Bob for his kind help. Two were used by me. Two were sold. I am all out.
Another run is ~ $1k for 5 more. Five is the minimum order. A bit
pricey, I know. However, they are made by a professional transformer
company. Fully enclosed and potted in silicone. If you consider what
technical wages are today and overhead and materials, I would say it
is fair pricing. However, at the hobby level, it is pricey.
If we can find five buyers (though this seems unlikely), I will
handle the details, and will sell at my cost + shipping.
Also, as you can see from this thread several people have been
successful winding their own.
One gentleman came here a year or so ago, asked a bunch of questions,
got great support from the group, ended up successfully winding his
own, and left. He was asked to put some details together (pictures,
documentation, video, etc), but apparently could not be bothered.
I hope you find a solution.
Thanks,
Dave
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Tek P6xxx probe reference question
I guess this is sort of an academic question about how Tek refers to their P6xxx probe series via a dimension.
In several probe accessory references Tek Refers to some probes in the series as "2.5mm" and others as "3.5mm" probes. I am trying to figure out to what part of the probe these dimensions apply. i can't seem to find any dimension on the probe body that comes close to those referenced except possibly the length of the bare tip. Could this be it?
Any ideas?
Greg
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DW,
That violet wire is the Flood Gun heater winding if my memory serves me correctly.
--
Michael Lynch
Dardanelle, AR,
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Re: Tektronix 585A Voltage Diagnoses Problem edited
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.
¡°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.
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On Aug 23, 2019, at 6:43 PM, randolphbeebe@... wrote:
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
...
The -150v adjustment pot does not change the voltage value at all.
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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,
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
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-----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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I fixed it, a purple wire soldered to the board broke loose and now it works, when in doubt recheck the wires something might have come loose
Thanks for the reply
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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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Tektronix 585A Voltage Diagnoses Problem
Hello All,
I have a nice 585A scope that has me stumped. The LV power is out of spec and I cannot trace the problem. Here are the voltage readings;
-150
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Exceedingly so.
You need to do the calibration sequence for the storage
section.
-Chuck Harris
DW wrote:
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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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I confirmed I am getting 370V, maybe this feature is know to stop working?
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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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Jason A.
Mlynch001
bill K7WXW
John Williams