Date   

P6133 PROBE TIP NEEDED

Michael W. Lynch
 

All:

Looking for a replacement Probe tip for P6133 - This could be 206-0265-12 or 206-0265-13. New or Good Used would be fine. Anyone who has and extra one and would be willing to sell it, please contact me OFF-LIST.

Thanks!
--
Michael Lynch
Dardanelle, AR


Re: Grabber Slip-On -- P6105 Probe

Mlynch001
 

Be careful of those Chinese made witches hats. They do not always work on the 6105/6106 probes that they are supposed to fit. I had one probe that did not work with them, but worked with a genuine Tektronix item. Strange as they looked identical. Just sayin.

--
Michael Lynch
Dardanelle, AR


Re: Grabber Slip-On -- P6105 Probe

 

If we're talking about the "witches' hats" then they seem pretty commonplace on eBay (in packs of 5 or 6 even). The issue I have is that the witches' hats for the miniature modular probes (e.g. P6120/P6121/P6122), while they look the same, seem to be different internally, so the ones that work for the P6105 (or the P6075/A) won't work on the "miniature" probes.

Here is a listing on eBay for a set of five witches' hats, it even mentions the P6105: https://www.ebay.com/itm/5-New-Probe-Hook-Gray-for-Tektronix-Probes-P6139A-P6138A-P6109-P6105-Etc/183265759558

The miniature probes also use a different ground clip (PN 195-0950-00) with a shrouded, cylindrical connector that is nearly impossible to find.


Re: I built a TM500 mainframe tester, and updated the design. Someone might find this useful?

Larry McDavid
 

No idea. I did not even know the files were up on TekScopes.

There are updates to the instruction manual and to at least the main board Gerber files.

You can access the files on Google Drive and upload them to TekScopes.

Larry

On 1/15/2021 2:54 PM, Mlynch001 wrote:
On Fri, Jan 15, 2021 at 04:05 PM, Larry McDavid wrote:


Note that Jared has updated the Gerber files and manuals stored on the Google
Drive site linked below.
Larry,
Did the files that are listed in the Tekscopes File section get updated as well?
--
Best wishes,

Larry McDavid W6FUB
Anaheim, California (SE of Los Angeles, near Disneyland)


Re: I built a TM500 mainframe tester, and updated the design. Someone might find this useful?

Mlynch001
 

On Fri, Jan 15, 2021 at 04:05 PM, Larry McDavid wrote:


Note that Jared has updated the Gerber files and manuals stored on the Google
Drive site linked below.
Larry,

Did the files that are listed in the Tekscopes File section get updated as well?

--
Michael Lynch
Dardanelle, AR


Re: Tektronix 214 Storage Scope

 

Hi Carl,
I found one for sale at a swap meet that didn't work so I was able to get it at a bargain.
Thanks to a friend I discovered a custom made battery pack was readily available for less than $20.
With a new battery pack I was amazed that this little scope ran for over 6 hours on a full charge.
It is an extremely handy scope to have when you are working on equipment where there is 220V or 440V AC power or isolated equipment where it would be dangerous to connect a conventional scope up for fear of a ground loop blowing out the scope.

I love my 214 storage scope. A few years ago I even found the carrying case for it.

Dennis Tillman W7pF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Carl Hallberg via groups.io
Sent: Friday, January 15, 2021 9:28 AM
To: TekScopes@groups.io
Subject: [TekScopes] Tektronix 214 Storage Scope

Hi Group,
Some years ago I got 2 basket case scopes. The problems involved a leaky diode and bad trigger chip in one and for both I decided to remove the batteries, and not have them internal to the scope. They had been leaking and I didn't want anymore damage. The regulator is a shunt type because a series regulator would have a voltage loss across it. It is good to plug it into the cigar lighter of a car or use a gel cell battery, but no longer uses the internal charging. I sold one of them to Jon Batters, who I miss on Tekscopes. Talked to him on the phone couple of times. Good conversations. The 214 nice little scope but only 500KHz.

Carl Hallberg (W9CJH)

https://groups.io/g/TekScopes/album?id=259407









--
Dennis Tillman W7pF
TekScopes Moderator


Re: I built a TM500 mainframe tester, and updated the design. Someone might find this useful?

Larry McDavid
 

Progress!

I have frozen the Group board-set order aggregation; most of those who "committed" to the group purchase have paid successfully by PayPal. But, these four never paid so are not included:

Glenn Little
Stephen Nabet
Wolfgang Schraml
Bruce Gentry

If any of those do want the board set, they should contact me privately.

I am holding requests from numerous others and can make a few board sets available if the four above don't promptly contact me.

*** And, I have placed the order for the boards with PCBWay! ***

We have Group member participants from USA, UK, Australia, Germany, France, Spain, Ireland, Canada and Romania. Who expected this much desire?

Jared Cabot, the designer of the tester and the circuit boards, has been very helpful throughout this process. Note that Jared has updated the Gerber files and manuals stored on the Google Drive site linked below.

I'll update the progress as I know it.

Larry McDavid

On 12/31/2020 11:27 AM, Jared Cabot via groups.io wrote:
Hi all,
I have been accumulating TM500 modules and mainframes for a little while, so I recently finished building an 067-1201-99 TM500 mainframe tester from the Tek construction notes floating around.
I updated the design somewhat and designed it for simplified construction (Not a single wire to strip and solder!) and I thought someone here might be interested in taking a look or even building one themselves.
Here's a link to the youtube video:
https://www.youtube.com/watch?v=Afwqtc6Fxd4
And here's a link to the google drive with all the gerbers and schematics and stuff. I went so far as to rewrite the manual with the alterations and corrections included.
https://drive.google.com/drive/folders/1yj52Z_BtGZ7Q9BB2jS9Lf2Uz39turS4-
Direct link to the new manual:
https://drive.google.com/file/d/1iqpcqheb01qMioQwcUhyWv6A37v2HPro/view?usp=sharing
Let me know what you think, and let me know if you see any errors that need correcting. :)
Regards
Jared
--
Best wishes,

Larry McDavid W6FUB
Anaheim, California (SE of Los Angeles, near Disneyland)


Grabber Slip-On -- P6105 Probe

 

Is there any source for the slip-on "grabbers" for the P6105 probe. These are Tek P/N 013-0107-0. I seem to have lost one. This will teach me not to keep a trash bucket under the scope on the scope-mobile. I would not minding finding an extra, too, just in case.

Bruce, KG6OJI


Re: Tektronix 492BP

d.schilling.net@...
 

I dropped i photo here
https://groups.io/g/TekScopes/album?id=259372

Photo says the external mixer enable is on the Z-Axis board S1010-2

<Fingers Crossed>


Photo Tek_492_SwitchSettings.jpg uploaded #photo-notice

TekScopes@groups.io Notification <noreply@...>
 

The following photos have been uploaded to the Tek 492BP album of the TekScopes@groups.io group.

By: d.schilling.net@...


Re: [Resurrecting a Tek 485] Sweep not from left to right ?

Tom Lee
 

Hi Leon,

Your post takes me back in time! I feel like adjusting an ion trap magnet now.

-- Cheers,
Tom

--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford University
Stanford, CA 94305-4070
http://www-smirc.stanford.edu

On 1/15/2021 11:23, Leon Robinson wrote:
In the days of 60 degree deflection all it took was turning the yoke end for end.


Leon Robinson  K5JLR

-------- Original message --------
From: Tom Lee <tomlee@ee.stanford.edu>
Date: 01/15/2021 10:23 AM (GMT-06:00)
To: TekScopes@groups.io
Subject: Re: [TekScopes] [Resurrecting a Tek 485] Sweep not from left to right ?
In the old days of crt TVs, it was fun to swap connections on the
deflection yoke. Upside down, right-to-left TV? Nanoseconds of hilarity
for kids.

Simpler times.

--Tom


Re: [Resurrecting a Tek 485] Sweep not from left to right ?

Leon Robinson
 

In the days of 60 degree deflection all it took was turning the yoke end for end.


Leon Robinson  K5JLR

-------- Original message --------
From: Tom Lee <tomlee@ee.stanford.edu>
Date: 01/15/2021 10:23 AM (GMT-06:00)
To: TekScopes@groups.io
Subject: Re: [TekScopes] [Resurrecting a Tek 485] Sweep not from left to right ?

In the old days of crt TVs, it was fun to swap connections on the
deflection yoke. Upside down, right-to-left TV? Nanoseconds of hilarity
for kids.

Simpler times.

--Tom

--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford University
Stanford, CA 94305-4070
http://www-smirc.stanford.edu

On 1/15/2021 08:18, marcosjl31@gmail.com wrote:
that one was an easy fix.





Groups.io Price Increases DO NOT Apply to TekScopes

 

I have read a copy of the email from Mark Fletcher very carefully line by
line. (although I am annoyed I did not receive a copy sent to me directly).

As I understand it these price increases DO NOT APPLY to TekScopes!
There is no reason to bring the subject of price increases up again on
TekScopes so please don't.

If you believe I am mistaken contact me OFF-LIST with the specific sentence
in Mark's email that I misunderstood and your explanation of how I
misunderstand it. If you do not already know how to contact me off list that
is a good clue you haven't been paying attention. Above all else do not send
a post to TekScopes asking how to contact me off-list since it completely
defeats the purpose of keeping irrelevant stuff off of TekScopes.

If you see Mark's message and you panic pay attention to these critical
sentences which you probably did not read or understand, take a deep breath,
and do not post your misunderstanding of what Mark wrote to TekScopes.

1) "I mentioned a year ago that I was considering changing to a per-member
based pricing scheme FOR NEW GROUPS."
--- TekScopes IS NOT a new group.

2) "These changes only apply to groups upgraded after Tuesday, February 2nd,
2021at 9am Pacific Time; EXISTING PREMIUM.GROUPS will keep their legacy
pricing."
--- TekScopes is an EXISTING premium group.

3) "Premium groups will now have 30GB storage. EXISTING PREMIUM GROUPS will
get this storage bump as well."
--- TekScopes will get the storage bump to 30GB from 20GB. This is good
news. We are currently using 5.9GB of storage but it is starting to grow.

Dennis Tillman W7pF


Re: Coketron - the "Real" Story from Peter Keller :) :) :)

Tom Lee
 

Instructions for the humor- and google-impaired, eh?

I never imagined that there would be a need to distinguish what one would do for a one-off hack, from what one does for a commercial product. Silly me.

If one wanted to simplify things to the barest bones, you'd do something not too far off from what the Coketron looks like: A mash-up of two already-manufactured items. You can buy a 1EPx crt -- they're still around on ebay and the like. Not cheap, but not out of the question for a one-off, either. Carefully cut off the face, maybe using the hot-wire-shock technique. This will be a low-yield process.

That gives you a base with pins (so you don't have to master the tricky art of making feedthroughs), the gun, the grids and the deflection plates, all pre-made and pre-aligned.

What about the phosphors? Easy peasy -- just do what Ferdinand Braun did for the first crt: Crush up some willemite (readily available from mineral shops; very cheap), make a slurry with some water and pour a bit into the coke bottle. Swish it around. Let dry. There's your screen.

Ordinary xerox paper would work, too, but the Coke bottle shape doesn't make that too practical. But the fluorescent bleach used to make paper look whiter also lights up quite nicely under electron bombardment. My guess is that you could probably mix laundry bleach with some other goo to make a workable phosphor, too. But that sounds an awful lot like chemistry or materials science, and I'm four years shy of a degree in either.

The trickiest part is to join the two subassemblies. I probably wouldn't try abutting them. Rather, I'd interpose a cylindrical piece, after having made a nipple in it for connecting the vacuum pump. Join the Coke bottle to one end of the cylinder, the gun to the other, then fire up the vacuum pump. Maybe use my homebrew induction ring to heat up the gun to drive out any adsorbed gas picked up after cracking it open.

Want to get fancy? Wind a PDA helix around the Coke bottle for increased intensity. Focus won't be too great, but hey -- /it's a Coke bottle crt/. The point isn't to compete with the 7104's MCP.

--Tom

--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford University
Stanford, CA 94305-4070
http://www-smirc.stanford.edu

On 1/15/2021 09:28, Roy Thistle wrote:
On Fri, Jan 15, 2021 at 06:28 AM, Tom Lee wrote:

makes me want to go and build one
Not to imply one thinks it is... but, it is not so easy... even if one's institution funds a glass fabrication shop (and many no longer do)... and has a skilled scientific glassblower (Dodos may be rarer.)... and one has a source of electron gun assemblies... and one has available high vacuum technology.
Back then electron gun assemblies (basically, the entire rear end of a CRT: from pins, to electron gun... including a getter... and a nipple for evacuation) ... those assemblies were readily available... although sourcing assemblies with deflection plates for electrostatic deflection would probably have been harder. (... electron gun assemblies for CRTs using electromagnetic deflection were being manufactured in the 10s of millions?... specialty ones for electrostatic deflection, not so much.)
Fabricating a reasonable electron gun assembly would probably be an order of magnitude higher, and probably a project breaker too, for most.
Given one has access to the "men and materials," it is not so easy as chucking up a coke bottle on one end of a glass lathe, and a crt assembly on the other end... and then having a go at it with a double headed torch.
There is a technology of skill, and materials, to making successful glass to glass seals that are sufficiently vacuum tight and sufficiently stress free that the seal lasts.
And what about a phosphor... is the visible cathodoluminescence of soda lime glass alone sufficient, given it is the bottom of a bottle being struck.
But about these things... maybe, we shall see.




Re: Coketron - the "Real" Story from Peter Keller :) :) :)

 

My copy of the book just arrived (thanks Dennis!) and I see that I misunderstood how the Coketron was constructed. I had thought that the cathode and deflection plates were inserted into the neck of the Coke bottle, but they are actually contained in their own cylindrical envelope that is merely joined to the mouth of the Coke bottle. That also goes some way toward explaining why they had difficulty with the glass-to-glass joint (though I wonder why they didn't make the other envelope from Coke bottle glass. I suppose that the glass used for the envelope has specific material properties to make a good seal around the metal pins, or something similar)


Re: Coketron - the "Real" Story from Peter Keller :) :) :)

Michael A. Terrell
 

Glass bottles were half gallon, not two liter.

On Fri, Jan 15, 2021 at 9:01 AM Dennis Tillman W7pF <dennis@ridesoft.com>
wrote:

Peter Keller asked me to pass this along to the group.

I'm sure he was smiling the entire time he wrote it.

Dennis Tillman W7pF



I guess it is time for the real story of the Coketron to be exposed.



The Coketron was originally developed for the cost reduction of the 545-B
with the new 545-C [ 545-C nomenclature - C for "Cokescope" ].



Advantages of the "Cokescope" included:

1. Lower material cost - Coke bottles only cost a few cents vs. several
dollars for CRT bulbs.

2. Independence from on-time supply issues caused by labor strikes at
Lancaster Glass and periodic flooding of the Corning Glass plant by the
nearby Chemung River. Coke bottles were always available anywhere.

3. Added employee benefits at Tek - the Coke bottles had to be emptied
by the bulb prep group before use.



The disadvantages that caused the program to be cancelled were pattern
distortions and how-the-heck do you paint the accelerator helix on the
double reentrant curve of the bottle? Also, the glass 2-liter Coke bottles
necessary to better fill the big round hole in the 545-C front panel were
not yet perfected. 2-liter plastic Coke bottles were tried but they tended
to sag into strange shapes at bake-out.



Seriously though, Tom Lee was closest.

Two Coketrons were made several years apart in the Engineering Tube Lab
just
to show that it could be done. The first used a T3100 or T3160 gun and
worked surprisingly well. I can remember it displaying the crosshatch
pattern generated by the CRT engineering B2 test sets. Unfortunately, the
tube later rolled off a bench and failed the impromptu drop test. I believe
it was during a lab move.



The second tube used a T2110 gun and suffered a cracked bulb due to thermal
coefficient mismatch of the glasses during processing. This was repaired
and
became the tube pictured in my book. This one did not have phosphor on the
screen but glass fluorescence would usually suffice to display a trace.
Both
tubes did have complete electron guns with deflection plates. I can't
recall
the second tube actually being operated but excessive gas levels due to
little or no bake-out because of the TC mismatch might have been the
reason.
I remember it was mainly constructed for photos since we had none of the
first tube.



There you have the rest of the stories. Take your pick!



All of this was 30+ years ago so memories are a little fuzzy.



Peter Keller









Re: Coketron - the "Real" Story from Peter Keller :) :) :)

Roy Thistle
 

On Fri, Jan 15, 2021 at 06:28 AM, Tom Lee wrote:


makes me want to go and build one
Not to imply one thinks it is... but, it is not so easy... even if one's institution funds a glass fabrication shop (and many no longer do)... and has a skilled scientific glassblower (Dodos may be rarer.)... and one has a source of electron gun assemblies... and one has available high vacuum technology.
Back then electron gun assemblies (basically, the entire rear end of a CRT: from pins, to electron gun... including a getter... and a nipple for evacuation) ... those assemblies were readily available... although sourcing assemblies with deflection plates for electrostatic deflection would probably have been harder. (... electron gun assemblies for CRTs using electromagnetic deflection were being manufactured in the 10s of millions?... specialty ones for electrostatic deflection, not so much.)
Fabricating a reasonable electron gun assembly would probably be an order of magnitude higher, and probably a project breaker too, for most.
Given one has access to the "men and materials," it is not so easy as chucking up a coke bottle on one end of a glass lathe, and a crt assembly on the other end... and then having a go at it with a double headed torch.
There is a technology of skill, and materials, to making successful glass to glass seals that are sufficiently vacuum tight and sufficiently stress free that the seal lasts.
And what about a phosphor... is the visible cathodoluminescence of soda lime glass alone sufficient, given it is the bottom of a bottle being struck.
But about these things... maybe, we shall see.


Tektronix 214 Storage Scope

Carl Hallberg
 

Hi Group,
Some years ago I got 2 basket case scopes.  The problems involved a leaky diode and bad trigger chip in one and for both I decided to remove the batteries, and not have them internal to the scope.  They had been leaking and I didn't want anymore damage.  The regulator is a shunt type because a series regulator would have a voltage loss across it.  It is good to plug it into the cigar lighter of a car or use a gel cell battery, but no longer uses the internal charging.  I sold one of them to Jon Batters, who I miss on Tekscopes.  Talked to him on the phone couple of times.  Good conversations.  The 214 nice little scope but only 500KHz.

Carl Hallberg (W9CJH)

https://groups.io/g/TekScopes/album?id=259407


Photo Notifications #photo-notice

TekScopes@groups.io Notification <noreply@...>
 

The following photos have been uploaded to the Tektronix 214 storage scope album of the TekScopes@groups.io group.

By: Carl Hallberg


The following photos have been uploaded to the Tektronix 214 storage scope album of the TekScopes@groups.io group.

By: Carl Hallberg


Photo Notifications #photo-notice

TekScopes@groups.io Notification <noreply@...>
 

Carl Hallberg added the album Tektronix 214 storage scope: Converted internal battery operation to external 12 Volts source #Tektronix214


The following photos have been uploaded to the Tektronix 214 storage scope album of the TekScopes@groups.io group.

By: Carl Hallberg

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