Date   

Re: 2465B - Weak Readout Intensity

flanneltuba@...
 

I have to admit it is tempting to try bumping up the heater voltage and seeing if the tube will eek out a bit more brightness. Some part of me though can't bring myself to making such mods to a Tek scope of this particular pedigree. This old gal is too proud to stoop to a facelift! :) Another aspect that holds me back from this is knowing that this would really amount to a temporary fix. If the cathode is already spitting out its last gasps of electrons, forcing it to work harder surely will only bring desired results for limited amount of time. I would always be worrying that it would fizzle out at any moment. It also seems to me this technique would cause a considerable amount of extra heat to be generated in the tube, which feels bad somehow. I suppose if there were no surplus/used CRTs available at all, this would be a much more enticing path.

I recall using one of the old fashioned color TV CRT "restorers" on a Sony Trinitron sidewalk salvage back in my college days in the early 80's. It did the trick quite neatly as I recall. Never tried the grid-cathode arc technique. Sounds fun, but pretty chancy. Then there's the CRT neck whack... I'm just imagining the Wile E. Coyote comic moment standing there with that resigned look on his face, the imploding CRT in his hands in a halo of flying glass. We used to whack old hard disks that had developed "sticktion" in a similar fashion to the horror of any onlookers. Worked about 50% of the time.


Re: Push-push switch repair (need some theory of operation)

Ke-Fong Lin
 

I dare to say perfect. It seems it's industry standard.


Re: Push-push switch repair (need some theory of operation)

EJP
 

Ke-Fong

How was the fit of the original Tek shaft to the actuator on the new button?

EJP


Re: Push-push switch repair (need some theory of operation)

Ke-Fong Lin
 

Hi Dennis,

I should have mentioned that these switches are the best solution available so far that is easily and cheaply available.
Indeed, they would have been perfect drop-ins if they were to be directly soldered on PCB (for instance TM500 modules).
With Tek's original switches, the soldering pins are basically metal rods.
I guess they can slide it up or down to the correct height and trim the excess.
Yet, on the 5CT1N, the risers ("stilts") are not even at the correct height.
The shafts to the panel buttons have a slight angle making them slight diagonal and not completely straight.
That should put some stress on the mechanism.
Yet, that module is probably older than me, and still working. So I guess it's ok :)

Best regards,


Re: TDS3000B USB floppy emulator

Tom B
 

Hello,

Thank you.  I looked at several youtube videos and loading the firmware looks pretty straight forward.  I noticed that there are Gotek branded products, and I assume, there are clones from the same design.  I have not seen anyone that said which firmware works for the TDS3000 but the flashfloppy looks pretty generic.

Tom

On 2/2/2020 5:02 AM, Alexandre Souza wrote:
You can buy any gotek floppy emulator (pratically all new flloppy emulators
are gotek made/compatible) and load the flashfloppy firmware. Probably it
will work. If not you can drop a message on github or flashfloppy facebook
comunity and people will help you

---8<---Corte aqui---8<---
https://urldefense.com/v3/__http://www.tabajara-labs.blogspot.com__;!!KfGNmQmE!w3lbKVHzXgsFQkTAySPtOGa8lkWAAzjuPWUIk1-ySLHuMvJN19L3cFxXqJFQ$
https://urldefense.com/v3/__http://www.tabalabs.com.br__;!!KfGNmQmE!w3lbKVHzXgsFQkTAySPtOGa8lkWAAzjuPWUIk1-ySLHuMvJN19L3cBHAcUwo$
---8<---Corte aqui---8<---


Em dom., 2 de fev. de 2020 às 00:15, Tom B <tbryan@...> escreveu:


Re: Push-push switch repair (need some theory of operation)

 

Hi Ke-Fong Lin,
At the time I suggested these switches I forgot that occasionally Tek did use switches that were high up on "stilts". I think Tek must have done this so the push button ended up located in a spot on the front panel where there was room for it. For the application I had, I was glad when I finally found a switch that1) came in so many configurations, 2) had pins in exactly the right spacing, and 3) cost so little. They were a perfect solution for me because they were replacing a switch that was mounted on the PC Board.
Dennis Tillman W7pF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Ke-Fong Lin
Sent: Sunday, February 02, 2020 12:32 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Push-push switch repair (need some theory of operation)

Hi everyone,

So I bought the replacement switches suggested by Dennis.
And it now works! I've updated the photos.
However, these are not completely drop-ins, issue is mainly length of the solder pins.

The 6PDT switches are ok, with the risers (green), the leads are barely crossing the PCB soldering holes.
But that's actually not a problem as the PCB is double sided and I've soldered the soldering pins from "above", while filing the bottom with solder. The result is as sturdy as before.
In fact, here, the switches are higher than originals (the green risers sit lower because of the soldering pins shape), but that's a better.
It's difficult to see on the photo but the black shafts of the non replaced switches are slightly "diagonal" and that put some stress on them.
The replaced ones, which sit higher, have "straighter" black shaft.

The 4PDT is problematic as the soldering pins are just too short. So I cut them and resolder on the solder lugs so as to make "extenders".
I've used epoxy to glue the (gray) risers on the switch so they are at correct height.
The solder pins are hard metal difficult to bend and solder is actually quite solid, so it works!
It looks a bit "ghetto style" (see photo) but once soldered, that's not so much apparent, and above all, probably as sturdy as the original.

Best regards,






--
Dennis Tillman W7PF
TekScopes Moderator


Re: 5111 Storage Scope Loss of -30VDC

p mc
 

tl;dr: check the 5115 manual at http://w140.com/tekwiki/wiki/5115

I don't know how much 51xx history you know, so please pardon if I tell what you already know.

Maybe you have two manuals from early years when your scope was sold as two products, 5103N & D11, with two separate manuals. Like this:
http://w140.com/tek_5103N_brochure.pdf

After a few years Tek changed 5100-series nomenclature so that each combination became a single product. What was 5103N + D11 became 5111. They also combined the manuals. (This story has a point, I promise) The first turn of combined manuals were simply three things in a single binding: a cover page announcing that the formerly separate manuals were now bound together followed by the two formerly separate manuals. Initially, the D11 display was covered by the "D11/D15" manual. The early 5115 manual simply bound the D11/D15 manual & 5103N manuals together. So (the point), the early 5115 manual covers your 5111. Link above. Presumably, the first 5111 & 5115 manuals differed only by part number and title page. It's "one manual", but really not much different from having two manuals.

Christian Weagle wrote about the 5000-series at http://www.i9t.net/5000_scopes.html
There is lots of info and a few... imperfections. Mr. Weagle disappeared without comment, so it remains as it is.

Thanks for answering re your interface board. I've been trying to work out a conherent history of the 51xx line since researching the 5D10 - which depended on interface board revision. I think maybe late 5111/pre 5111A units did not have that daughter card. Just a piece of a puzzle.


Re: Push-push switch repair (need some theory of operation)

Ke-Fong Lin
 

Hi everyone,

So I bought the replacement switches suggested by Dennis.
And it now works! I've updated the photos.
However, these are not completely drop-ins, issue is mainly length of the solder pins.

The 6PDT switches are ok, with the risers (green), the leads are barely crossing the PCB soldering holes.
But that's actually not a problem as the PCB is double sided and I've soldered the soldering pins from "above", while filing the bottom with solder. The result is as sturdy as before.
In fact, here, the switches are higher than originals (the green risers sit lower because of the soldering pins shape), but that's a better.
It's difficult to see on the photo but the black shafts of the non replaced switches are slightly "diagonal" and that put some stress on them.
The replaced ones, which sit higher, have "straighter" black shaft.

The 4PDT is problematic as the soldering pins are just too short. So I cut them and resolder on the solder lugs so as to make "extenders".
I've used epoxy to glue the (gray) risers on the switch so they are at correct height.
The solder pins are hard metal difficult to bend and solder is actually quite solid, so it works!
It looks a bit "ghetto style" (see photo) but once soldered, that's not so much apparent, and above all, probably as sturdy as the original.

Best regards,


Re: 7000 Series plugins in need of repair and a good home

Miguel Work
 

Can you please send me list to harrimansat@...?


All my 7000 plugins are working, I have learn a lot those years with them. Now I need a TDR to play with it, a 7L5 with TG and a rare 7L18

Thanks
Regards

Miguel

-----Mensaje original-----
De: TekScopes@groups.io [mailto:TekScopes@groups.io] En nombre de Dennis Tillman W7PF
Enviado el: domingo, 2 de febrero de 2020 1:24
Para: TekScopes@groups.io
Asunto: [TekScopes] 7000 Series plugins in need of repair and a good home

I have quite a few 7000 plugins in need of repair and I don't have the time to do it.
I have two goals in mind: 1) be sure each plugin goes where it will do the most good;
2) Learn how to become a better troubleshooter from your suggestions and skills.

THEY ARE IN PERFECT CONDITION
They are complete - all parts are there. Nothing is broken.
All knobs, switches, push buttons, levers, etc work.
All the knobs are present. There are no bent shafts, etc.
Last summer I tested every one. I spent about an hour checking everything.
If I encountered a problem with it I wrote down what the problem was.
I then guessed what might be causing it and looked at that section of the circuitry.
If I found nothing unusual or out of the ordinary I set it aside for something to do when I had more time.

These are not parts mules.
DON'T ASK FOR A LIST UNLESS YOU INTEND TO REPAIR THEM.
If you find debugging hardware challenging then there might be something you can use in my list of plugins.
If you would like my list email me off list at dennis at ridesoft dot com.
The SUBJECT of your email should be" Send me your list of broken 7K plugins".
Otherwise your email might be lost in all the other stuff I get.

ESSAY QUESTIONS: I am very interested in learning more about you and how you go about troubleshooting 7K plugins.
It is likely I will get more requests than I have plugins. In that case your answers to these questions will help me choose who to give them to:
Which 7K MFs and plugins do you have now?
What do you use them for?
What have you repaired in the past?
Why tools, instruments, hardware, documentation, education, skills, strategies, checklists, and anything else do you have that makes it more likely that you will be able to find the problems in these or any 7K plugins?
Which plugin you want and why?
What will you use it for when you fix it?
What is the most interesting thing you have ever used a 7K oscilloscope for?
How bad do you want this plugin?
If you have pictures of you lab include them in your email.

THE BAD NEWS: There is no free lunch
These will cost $20 to $25 in USPS postage to ship to anywhere in the US.
Nobody makes boxes the right size to send a single plugin in.
They do make boxes that are the perfect size for two plugins.
These are the boxes I bought. If you find two plugins on my list the postage goes up to $30 to $35 which is less per plugin.

Dennis Tillman W7pF


Re: Looking for some TM500 series modules.

Craig Cramb
 

Jared,
I can help fill this list. Contact me off list. Electronixtoolbox at gmail dot com

Craig


If anyone has any of these in the list below that you are willing sell and to ship to Japan,


Re: 5111 Storage Scope Loss of -30VDC

Bob Wilson
 

Yes it does have the plug in board on the rear of the Interface board. I think I saw somewhere there two differerent versions of this board. One for single beam and one for dual beam scopes.
For some reason I seem to be switching between two different downloaded manuals for this scope. One has part of the schematics and one had the other half.

Bob


Looking for some TM500 series modules.

Jared Cabot
 

I have a small list of TM500 series modules that I am looking to obtain. If anyone has any of these in the list below that you are willing sell and to ship to Japan, let me know.

- TM506 / TM5006 enclosure
- PS503A
- PG506
- SG504
- FG501A
- TG501A (with Option 01)
- PG502

Let me know what you've got! :)
Thanks!


Re: Darlington Transistor Generic Number

Dale H. Cook
 

On 2/2/2020 2:11 AM, Gary Robert Bosworth wrote:

Does anyone know the generic part number and manufacturer for the Tektronix part number 151-0405-00?
As Tim Phillips noted, this is a selected part, and an ordinary MJE800 may not perform properly in its place. Sphere Research in West Kelowna, BC has 3 used 151-0405-00 in stock for $5 each (plus shipping and duty). Sphere has long been my go-to for original HP and Tek parts.
--
Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA
https://plymouthcolony.net/starcity/radios/


Re: My TDR Evaluation of the SG503 012-0482-00 Cable has been uploaded

Jared Cabot
 

Sorry for digging up an old post, but has anyone compared the Pomona 2249-Y cable to the Tek 012-0482-00?

The Pomona one uses RG223/U cable like the Tek part and is available in a 36" length so I'm wondering how close its performance is?


Please send me your list of broken 7K plugins

momemeca
 

Hello Dennis,
Greetings from the beautiful Mornington Peninsula, near Melbourne, Australia.
I am Physicist and professional Electrical / Electronics / Mechatronics Engineer working at The Australian Synchrotron where I work mainly on accelerator control systems.
My love affair with all Tektronix equipment of old began with the 500 series oscilloscopes at college and university in the UK (late 70s) and, subsequently, in my early professional years in Oz (early 80s onwards).
I have been a keen collector and restorer for some 35 years now and have, mainly, series 500 CROs (~6), associated plug-ins (~12), accessories (misc) and series 7000 (4), associated plug-ins (~20).
Most of those are in current use in my lab as they are "cycled" into service according to their functions and capabilities.
Apart from those I have a 2465B CRO and 2712 spectrum analyser in the lab plus a contingent of Hewlett-Packard high precision instruments.
Why do I love these instruments? Well, my answer would certainly resonate with that of many fellow contributors herein; it is the elegant design of Textronix's bygone years, their clever manipulation and application of foundation electrical and electronics theories and use of the latest devices of the day. Not to mention the sheer accessibility and gorgeous mechanical build.
I genuinely feel that I am doing my bit to contribute to the survival of these old gems and, one day, pass them on to a new generation of appreciative "fan-a-tics".
Now that I have started to plan towards my impending retirement, I will have more free time to devote my free time to working on restoration, repairs and calibration (and perhaps even writing articles on same for our excellent TEK-WiKi).
We are not as blessed, here in Oz, with the availability of vintage Tektronix (or other USA equipment) as compared to the USA. Therefore, I am constantly on the internet searching for affordable instruments. Unfortunately, freight charges tend to be a prohibitive kill-joy!
If I am Lucky enough to benefit from your generosity I would be more than happy to provide components of your "Essay" list.

On another note - I was saddened to read of Barrie Gilbert's passing. A huge loss, indeed, to the world of analogue design.

Cheers,

Rick
Mornington Peninsula, Victoria, Australia.

On 2 Feb 2020, at 11:23, Dennis Tillman W7PF <@Dennis_Tillman_W7pF> wrote:

I have quite a few 7000 plugins in need of repair and I don't have the time
to do it.
I have two goals in mind: 1) be sure each plugin goes where it will do the
most good;
2) Learn how to become a better troubleshooter from your suggestions and
skills.

THEY ARE IN PERFECT CONDITION
They are complete - all parts are there. Nothing is broken.
All knobs, switches, push buttons, levers, etc work.
All the knobs are present. There are no bent shafts, etc.
Last summer I tested every one. I spent about an hour checking everything.
If I encountered a problem with it I wrote down what the problem was.
I then guessed what might be causing it and looked at that section of the
circuitry.
If I found nothing unusual or out of the ordinary I set it aside for
something to do when I had more time.

These are not parts mules.
DON'T ASK FOR A LIST UNLESS YOU INTEND TO REPAIR THEM.
If you find debugging hardware challenging then there might be something you
can use in my list of plugins.
If you would like my list email me off list at dennis at ridesoft dot com.
The SUBJECT of your email should be" Send me your list of broken 7K
plugins".
Otherwise your email might be lost in all the other stuff I get.

ESSAY QUESTIONS: I am very interested in learning more about you and how you
go about troubleshooting 7K plugins.
It is likely I will get more requests than I have plugins. In that case your
answers to these questions will help me choose who to give them to:
Which 7K MFs and plugins do you have now?
What do you use them for?
What have you repaired in the past?
Why tools, instruments, hardware, documentation, education, skills,
strategies, checklists, and anything else do you have that makes it more
likely that you will be able to find the problems in these or any 7K
plugins?
Which plugin you want and why?
What will you use it for when you fix it?
What is the most interesting thing you have ever used a 7K oscilloscope for?
How bad do you want this plugin?
If you have pictures of you lab include them in your email.

THE BAD NEWS: There is no free lunch
These will cost $20 to $25 in USPS postage to ship to anywhere in the US.
Nobody makes boxes the right size to send a single plugin in.
They do make boxes that are the perfect size for two plugins.
These are the boxes I bought. If you find two plugins on my list the postage
goes up to $30 to $35 which is less per plugin.

Dennis Tillman W7pF




Re: TDS3000B USB floppy emulator

Alexandre Souza
 

You can buy any gotek floppy emulator (pratically all new flloppy emulators
are gotek made/compatible) and load the flashfloppy firmware. Probably it
will work. If not you can drop a message on github or flashfloppy facebook
comunity and people will help you

---8<---Corte aqui---8<---
http://www.tabajara-labs.blogspot.com
http://www.tabalabs.com.br
---8<---Corte aqui---8<---


Em dom., 2 de fev. de 2020 às 00:15, Tom B <tbryan@...> escreveu:

Hello,

I looked at these. It looks like all are SD, not USB. I also need a 26
pin interface. HXC did have one USB emulator with a 26 pin interface
but it is USB type B. Not quite what I want.

I did find one on ebay for about $30US that looks like it will fit but
I don't know if it will function in the oscilloscope.

Tom



On 2/1/2020 8:03 PM, Geoffrey Smith wrote:
Have a look at
https://urldefense.com/v3/__http://hxc2001.free.fr/floppy_drive_emulator/__;!!KfGNmQmE!1spBXzicCsUJKw4KZxEE3pSMbfpGjM0Hm2JVHq4ESgwQLxm3yt0zLa67KhdX$

HXC may already have one or , from experience, seem happy to program one
for you.

-



Re: Darlington Transistor Generic Number

 

Hi Gary,
Yes there is a database of Tek semiconductors.
You need to discover the amazing resource we have called Tekwiki.
http://w140.com/tekwiki/wiki/Main_Page

If you search for Common Design Parts Catalogs you will find a whole bunch of them. In your case you would want the Semiconductor one this time. It lists Tek semiconductors lots of different ways, including by manufacturer's part number, specifications, etc.
Have fun.
Dennis Tillman W7pF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Tim Phillips
Sent: Saturday, February 01, 2020 11:23 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Darlington Transistor Generic Number

from Tim P (UK)
151-0405-00 is a MJE800
My manual for the 5441 'scope says 'selected from'
Tim


On Sun, 2 Feb 2020 at 07:12, Gary Robert Bosworth <@grbosworth>
wrote:

Does anyone know the generic part number and manufacturer for the
Tektronix part number 151-0405-00? It is an NPN Silicon darlington
transistor in a TO-126 package. It is used in the power supply of the
Tektronix Model 577 curve tracer. Also, is there a database of
cross-referenced Tek part numbers?

Gary







--
Dennis Tillman W7PF
TekScopes Moderator


Stan Griffiths Obituary

 

I uploaded Stan's obituary to the files section of TekScopes. It is at
https://groups.io/g/TekScopes/files/Stan%20Griffiths%20Obituary

Dennis Tillman W7pF


Re: Darlington Transistor Generic Number

Tim Phillips
 

from Tim P (UK)
151-0405-00 is a MJE800
My manual for the 5441 'scope says 'selected from'
Tim


On Sun, 2 Feb 2020 at 07:12, Gary Robert Bosworth <@grbosworth>
wrote:

Does anyone know the generic part number and manufacturer for the
Tektronix part number 151-0405-00? It is an NPN Silicon darlington
transistor in a TO-126 package. It is used in the power supply of the
Tektronix Model 577 curve tracer. Also, is there a database of
cross-referenced Tek part numbers?

Gary




5441 Storage Scope Loss of +30VDC, -15V

p mc
 

Tim,

I've changed the subject for this post.

So maybe the 30V will be an easy "fix". tbd.

Someone reported fixing a dead +15V rail in a 5440 with a new MJE800, so apparently they aren't invincible.

https://groups.io/g/TekScopes/message/126094

Dunno that one event counts as a ding against reliability.

pmc

On Sat, Feb 1, 2020 at 02:02 PM, Tim Phillips wrote:


From Tim P (UK)

I have a manual, thanks - in fact, after perusing the schematic, I realised
that my +38 V on the +30V test point is the UNREG voltage.
So, maybe the erstwhile +30V is not being regulated at all. I will check
around the +30V circuitry. Are the Darlington pass transistors (MJE800)
reliable with age ?

Tim


On Sat, 1 Feb 2020 at 21:06, p mc <pmc@...> wrote:

Tim,

TekWiki has a complete 5441 manual. http://w140.com/tekwiki/wiki/5441
It doesn't have "voltage and waveform" data but has the schematic, board
layout, adjustment & Theory of Operation info.

Do you have that?

pmc

On Fri, Jan 31, 2020 at 10:14 AM, Tim Phillips wrote:


from Tim P (UK)
re the 5111 - what was the problem with the -30V ?
I have a 5441 with a low -15V (11V) and a high +30V (+38V)
The LVPS in the 5000-series seem to be very similar. I would be
interested
in your investigations and cure
regards
Tim