Re: Wanted 067-0681-01 Tunnel Diode Pulser by new member
On 05/20/2018 09:41 PM, Jeff Davis wrote: Hi Craig,
You can easily build one in just a few hours. The only challenge is obtaining the right tunnel diode (eBay), mounting it (use conductive epoxy), and confirming the rise time is within spec (I borrowed a high speed scope from my work for this). The other parts are garden varieties obtainable from Digikey.
I built two of them but sold the second on eBay.
There was a great posting by one of our members, Sergey, on this. I don¡¯t have the details handy where I¡¯m at but Please put the link here also.
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Re: Wanted 067-0681-01 Tunnel Diode Pulser by new member
Hi Craig,
You can easily build one in just a few hours. The only challenge is obtaining the right tunnel diode (eBay), mounting it (use conductive epoxy), and confirming the rise time is within spec (I borrowed a high speed scope from my work for this). The other parts are garden varieties obtainable from Digikey.
I built two of them but sold the second on eBay.
There was a great posting by one of our members, Sergey, on this. I don¡¯t have the details handy where I¡¯m at but if you are interested in going this route I¡¯ll look them up and send them to you.
Jeff / N0DY
Sent from my iPhone
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On May 20, 2018, at 7:27 PM, Craig Cramb <electronixtoolbox@...> wrote:
Looking for a working condition Tektronix 067-0681-01 Tunnel Diode Pulser for doing the Cal 6 on a 2400 series scope. I have all other tools but am missing this tool to complete the full calibration sequence. Please reply to electronixtoolbox@...
if you can help.
My background is 42 years working in the HVAC industry. But I have had the hobby for about 25 years learning about and repairing Tektronix scopes. Not an expert just have some experience of a lot of trial and error getting them working. I started with the 475 model and with a manual and advise from Reed D. Learned how to navigate thru the Tek manuals and have been somewhat successful at repairs. Since then I went to the T900, 455, 465, 2430/A, THS700, 222 and onto the 2400 series. Which now I mainly deal with the 465 and 2465b,2467B scopes. Over time I¡¯ve acquired TG501,PG506,SG504,SG503. Several that are non working and still don¡¯t work today and some that are fully working. I seem to not have the knack of fixing plug-ins.
I have many scopes that I need to repair in my shop. I just hate to see them parted out or thrown away when the majority can be fixed with a fair amount of time and effort. I¡¯m not retired yet but hope to be soon so I then can spend more time with the units in my shop.
If you have made it this far in this note. Thanks for reading and ask any questions you have.
Craig Cramb
Wichita,Ks
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Wanted 067-0681-01 Tunnel Diode Pulser by new member
Looking for a working condition Tektronix 067-0681-01 Tunnel Diode Pulser for doing the Cal 6 on a 2400 series scope. I have all other tools but am missing this tool to complete the full calibration sequence. Please reply to electronixtoolbox@...
if you can help.
My background is 42 years working in the HVAC industry. But I have had the hobby for about 25 years learning about and repairing Tektronix scopes. Not an expert just have some experience of a lot of trial and error getting them working. I started with the 475 model and with a manual and advise from Reed D. Learned how to navigate thru the Tek manuals and have been somewhat successful at repairs. Since then I went to the T900, 455, 465, 2430/A, THS700, 222 and onto the 2400 series. Which now I mainly deal with the 465 and 2465b,2467B scopes. Over time I¡¯ve acquired TG501,PG506,SG504,SG503. Several that are non working and still don¡¯t work today and some that are fully working. I seem to not have the knack of fixing plug-ins.
I have many scopes that I need to repair in my shop. I just hate to see them parted out or thrown away when the majority can be fixed with a fair amount of time and effort. I¡¯m not retired yet but hope to be soon so I then can spend more time with the units in my shop.
If you have made it this far in this note. Thanks for reading and ask any questions you have.
Craig Cramb
Wichita,Ks
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Re: vintageTEK Museum Microfiche FINANCIAL help
Got it. I donated $25. Thanks for the pointers and of course, once again, for everyone's help on this forum for the last year. I'm a newcomer to the space and am somewhat overwhelmed by the generosity of this forum's members. On Sun, May 20, 2018 at 6:28 PM, Dave Brown <davebr@...> wrote: The home page, blog, and YouCaring site all say that monies donated above
the goal will help to improve the infrastructure for the scanner. This
would be improved networking, new computer, and new printer. Almost all of
the infrastructure at the museum are donated computers which are old. Any
donations above this will be used to support the museum. We don't charge
for admission or tours and have modest eBay sales so we rely almost
entirely on donations. A small number of people donate through their work,
some send us a check, but the vast majority of our donations are by on-site
visitors in our "fishbowl". We run a pretty slim operation relying
entirely on volunteers so all donations are appreciated.
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Re: 180A Time Mark Generator
Sorry for not replying sooner Tom, but yeah, they appear to be the same ones. A fellow Tekscopes member, Dave Wise, is sending me three of the mounts. Didn't figure McMaster would have them, so I didn't check there.
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On 5/18/2018 10:18 AM, tom jobe wrote: Hello,
I didn't see that you got a reply to your fan mount question yet so let me 'take a swing' at it.
The manual for the 180A does not show us a picture of the fan mounts, but they might be the ordinary ones that were used on many of the 500 series tube style scopes and curve tracers of similar vintage.
If the mounts are rubber with a simple threaded metal stud sticking out of each end, you can buy them from McMaster-Carr and other suppliers.
Maybe have a look at this page of the Mcmaster-Carr catalog, they have quite a selection of that style mount.
tom jobe...
On 5/16/2018 12:34 PM, Jerome D Leach wrote:
Recently picked one of these up in good, original condition. Seems to be an earlier one, with the serial being 5005. Pretty filthy, but literally has no dents, and does not exhibit any evidence of being tampered with.
The one issue that is obvious at this point, is that it possesses those rubber fan mounts, and they have rotted away.
Seems I have read here in the past that some folks have developed a repair for this situation. If so, I would appreciate knowing what others have done. Being a toolmaker by trade, I am sure I can come up with some sort of mounts. Still, I would like to see how other owners have addressed the problem.
.
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Re: vintageTEK Museum Microfiche FINANCIAL help
The home page, blog, and YouCaring site all say that monies donated above the goal will help to improve the infrastructure for the scanner. This would be improved networking, new computer, and new printer. Almost all of the infrastructure at the museum are donated computers which are old. Any donations above this will be used to support the museum. We don't charge for admission or tours and have modest eBay sales so we rely almost entirely on donations. A small number of people donate through their work, some send us a check, but the vast majority of our donations are by on-site visitors in our "fishbowl". We run a pretty slim operation relying entirely on volunteers so all donations are appreciated.
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Using a Tek sampling head
I have much enjoyed the recent discussion here about the 7T11/7S11/7S12 sampling plugins and have learned a lot from the contributions.
I have a long-term quest to get my Soviet Ya4S-100/Ya4S-101 sampling plugins working properly. They're roughly equivalent to the 7T11 and 7S11 but with some neat features, most notably a delta delayed timebase and slideback-type voltage measurement, both with digital display on the scope's readout. The problem is that I don't have the sampling head for them. I'm searching high and low for one (and learning quite a lot of Russian in the process) but they're like hen's teeth and always seem to have gone missing. The official sampling head is a dual channel feed through sampler with SR50-262 (almost identical to 'N' type) connectors for input and output. The good news is that the schematic is available, though seems to have been drawn by someone whose aim was to minimise the use of paper and ink rather than to create useful documentation.
The sampling plugin has a 19-way connector for the sampling head. This carries +/-15V, the signal and feedback for each channel, a single strobe, and a mysterious signal called 'threshold' which looks like a TTL logic output which alternates state on each trigger.
The good news is that my sampling plugins seem to be working well and all the signals on the connector do the right things, so the project is worth pursuing. My idea is to create an adapter cable so I can use Tek S-series sampling heads until I find the original one. I don't have any S-series heads at the moment, only SD-22 and SD-24 ones which involve too much software, so I'd have to buy one to try out.
I've looked at the manuals for the 7S11 and various sampling heads. Is there a clear specification anywhere of the interface, for example the amplitude of the strobe pulse and the signal and feedback connections? I would be quietly amused if the Soviet system turned out to be electrically compatible with the Tek one...
All advice and thoughts much appreciated,
Chris
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Re: vintageTEK Museum Microfiche FINANCIAL help
On 5/20/2018 10:28 AM, David Berlind wrote: Thanks... I just finally had a chance to go to the VintageTek home page and
it says the goal has already been reached. So, I'm trying to ascertain
whether a donation is still necessary?
Necessary: No Appreciated: Yes
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Re: using scope channel 1 and channel 2 invert and add functions vs floating DUT
Harvey, thanks for your example. I do somewhat the same with a voltmeter in respect to measuring voltage drop/gain rather than doing the math, I can get higher resolution too since the decimal moves over.
Your high voltage idea in respect to exceeding limits; would it be possible to use the 2 channels to measure a floating high voltage that exceeds the single channel to scope chassis limit of say, 500V peak? Given a 1M channel impedance, do I end up with a 2M impedance? Could this be a method to cut scope loading on the DUT in half?
And yes, this is an academic question, the examples help me to understand the testing possibilities with my scope.
NielsenTelecom
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Re: vintageTEK Museum Microfiche FINANCIAL help
Thanks... I just finally had a chance to go to the VintageTek home page and
it says the goal has already been reached. So, I'm trying to ascertain
whether a donation is still necessary?
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On Fri, May 18, 2018 at 2:16 PM, Adrian <Adrian@...> wrote: I just donated - The easy way is go to Vintagetek home page and follow the
link to the YouCaring donations page. Takes any credit/debit card but not
PayPal as far as I could see..
On 5/18/2018 7:02 PM, David Berlind wrote:
I would like to donate $25. How do I do that?
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SOLD OUT Tektronix Stuff for Sale
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Re: using scope channel 1 and channel 2 invert and add functions vs floating DUT
Jeff, thanks for the example. A question, I believe I've seen with this type amp, push-pull IIRC, where there is a common 'center' rail, where that voltage is 0, and there is a negative voltage for the lower waveform, and positive for the upper waveform, could you attach both probe's ground to that center rail and get the same waveform when displaying both channels? Assuming there is no potential between that rail and scope chassis.
Also, I'm not really thinking in terms of elevated voltages, perhaps I should be so not to limit the discussion either.
NielsenTelecom
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Re: WTB - Front Cover For 485 Portable Scope
I have a cover for my recently purchased 2213A- I tried not to reveal my delight to the seller :-)
Anyone know what other scopes it would fit? Measures about 13x5.25 inches.
Not sure I'd want to part with it, but I'd rather have a working scope! (I have two scopes that need repair- 465 and 464.)
Now if I could just get someone to visit Southern Indiana and fix my scopes...
Keith Ostertag
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Re: Test devices to check out new scopes??
Thanks to all who responded to my question.
Yes, I had in mind the waveform generator and not the LOGO generator.
Reasonable cost is in my mind is less than $100.
They are now hard to find the originals.
I used to attend the Tek sales demos where each person had a scope to play with and
they gave you a board that you could have to take home with you.
This was many years ago :-)
Again thanks to all who responded.
Marvin
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Re: 7a26 C130 (input compensation)
I'm using a pg506 and adjusting the trimmer right next to C134 the schematic has a pretty clear picture.
Albert Otten
3:53 am #148118
In theory with a 10X probe the sensitivity of the front corner amplification is nearly doubled compared to using a normalizer. So don't expect to see more effect with a normalizer.
Are you sure you use a not too slow (rise, fall) square wave generator?
Are you sure you adjust the correct trimmer? It's a thin tube trimmer with a long shiny center screw.
I am "trying" to calibrate my 7a26. Per table 5-2 on page 5-6 the instructions
tells me to adjust C130 for a square corner. Turning C130 on both channel one
or channel 2 have zero effect on the front corner, or any effect I can see at
all. I'm assuming this is a PEBSAC issue (problem exists between scope and
chair). I have no normalizer. I have ordered a 22pf and a 20pf but they wont
be here until Tuesday-Wednesday so I am using a 10X probe. Any tips on what
I'm doing wrong?
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Re: 7a26 C130 (input compensation)
In theory with a 10X probe the sensitivity of the front corner amplification is nearly doubled compared to using a normalizer. So don't expect to see more effect with a normalizer.
Are you sure you use a not too slow (rise, fall) square wave generator?
Are you sure you adjust the correct trimmer? It's a thin tube trimmer with a long shiny center screw.
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On Sat, May 19, 2018 at 12:07 pm, lop pol wrote:
I am "trying" to calibrate my 7a26. Per table 5-2 on page 5-6 the instructions
tells me to adjust C130 for a square corner. Turning C130 on both channel one
or channel 2 have zero effect on the front corner, or any effect I can see at
all. I'm assuming this is a PEBSAC issue (problem exists between scope and
chair). I have no normalizer. I have ordered a 22pf and a 20pf but they wont
be here until Tuesday-Wednesday so I am using a 10X probe. Any tips on what
I'm doing wrong?
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Re: Special Tek resistor needed
Send me a picture, Morris-if you can. Just need something to roughly ID them. I have a box of old 535/545 bits and pieces I nearly tossed recently but conscience got the better of me (fortunately)- although no telling it might not next time I'm looking to get a bit more space......
DaveB, NZ
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-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Morris Odell Sent: Sunday, May 20, 2018 16:22 To: [email protected]Subject: [TekScopes] Special Tek resistor needed Hi all, I am in need of the two ¡°Graham Cracker¡± resistors for the vertical amplifier of a 535A. They are 1.3K with two taps. If anyone has a couple of spares or a 535A carcass that can be a donor, I¡¯d very grateful if you could find me a couple. All costs reimbursed of course. Thanks, Morris Odell in Melbourne, Australia --- This email has been checked for viruses by AVG.
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Special Tek resistor needed
Hi all,
I am in need of the two ¡°Graham Cracker¡± resistors for the vertical amplifier of a 535A. They are 1.3K with two taps. If anyone has a couple of spares or a 535A carcass that can be a donor, I¡¯d very grateful if you could find me a couple. All costs reimbursed of course.
Thanks,
Morris Odell in Melbourne, Australia
---
This email has been checked for viruses by AVG.
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Re: Test devices to check out new scopes??
On 5/19/18 11:10 AM, Siggi wrote: On Sat, 19 May 2018 at 11:42 Marvin Moss <mmoss@...> wrote:
Hey Marvin,
here's <> a QuickStart 8 board, which
was used to demo the TDS5/6/700 series initially. It has several
interesting signals to look at, including a fast rise clock (with
significant jitter, though I don't know whether that's intentional), etc.
See this link <
>
for a manual. The price seems fairly outrageous though. In 2015 someone
sold a batch of those and I got mine at $40 as I recall. I have one of those as well, but I think I paid more than $40, but much less than the outrageous price.? The QAM is interesting on an analog scope; I don't recall trying it on a digital scope.? My 2440 claims the fast rise is less than a nanosecond, but I don't have anything faster (except perhaps a counter). I also have the board that's intended for the Tek 2440 and similar digital scopes.? It has a signal that requires Peak Detect to see properly. I also have a third board from another scope company (Rigol?? It's not marked.).? Its identifying feature is an off-center weight on a motor, making a vibrator.? IIRC there's a microphone on board.? One 16-position rotarty switch selects the function.? It's a "Solutions 3 Oscilloscope Demo Board". Of the three, I think I paid the most for the third one, but each was under $100.
Here's another demo board <>, though
this one is more recent.
Siggi
-- Jeff Woolsey {{woolsey,jlw}@jlw,first.last@{gmail,jlw}}.com Nature abhors straight antennas, clean lenses, and empty storage. "Delete! Delete! OK!" -Dr. Bronner on disk space management Card-sorting, Joel. -Crow on solitaire
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Re: Test devices to check out new scopes??
Try searching the group files and past messages for the test circuits.? There should be at least two schematics available, because I built one of them, and almost built the other.? I think the one I built had about 8 fixed outputs that highlighted various features of the scope, from simple waveforms to a really bizarre one that I think was meant to show you how to isolate small sections of a complex signal.? Now I'm wondering where it is... (That seems to be a common trend!? I have a box of about 50 chucking reamers in my garage somewhere, but after a few weeks of searching, I still haven't found them) Of course, as Dennis points out, they were made for specific scopes, so YMMV. -Dave From: Marvin Moss <mmoss@...> To: [email protected] Sent: Saturday, May 19, 2018 8:43 AM Subject: [TekScopes] Test devices to check out new scopes?? Tek used to supply little PCB's with various circuits to test out and let you try out new scopes. They had triggering experiments and other waveform generators to give you some experiencce with new scopes. My question is:? Does anyone have any of these that they would be willing to part with for a reasonable cost so I could get one to have for my Tek scopes?? Thanks, Marvin
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Craig Cramb
Marvin Moss