Date   

Re: In search of holdoff pot for 2235

John Hudak
 

clarification: it is a Clarostat.
Confusion: the Tek SM says it is a 50 Ohm pot which seemed wrong.
Searching I turned up says it is a 50K pot.
https://www.sphere.bc.ca/test/tek-parts/tekpots.html
Can someone clarify?


Re: In search of holdoff pot for 2235

adesilva_1999@...
 

Try this site: http://www.smcelectronics.com/tekpart.htm

If you cannot find it there, post a photo of the broken parts and we can see if we can give some ideas depending on how it is broken.


Re: 2247A Is this normal?

nielsentelecom@sbcglobal.net
 

Tom,

What is the P-P frequency response spec referred to as? I have a 2246A. I would think it is the same as a 2247A.


Re: In search of holdoff pot for 2235

 

part number came right up on eBay: https://www.ebay.com/itm/Tektronix-2235-oscilloscope-Variable-hold-off-potentiometer-311-2146-00-50Kohm/124429504441

Of course you could also pickup an entire parts mule for not much more.


In search of holdoff pot for 2235

John Hudak
 

Due to a freak accident, the shaft of the Variable Holdoff potentiometer broke and I need to replace it. The details are:
R9521 311-2146-00 Res, Var, Nonwir: 50 ohm, 20% 0.5W CM41773
It is a Clairstat p/n.
After doing a number of google searches, I am coming up empty.
Can someone please point me a source of the part?
(I am afraid that because it is so old, it may be NLA anywhere)
Thank you
Best regards
J


Re: Tektronix 492BP

 

Hi, but now when I do reseat the noise floor is bellow the screen I cant see it and the 100MHz cal signal is -57dBm instead of -20dBm hence I cant do the runtine calibration as it said not cal signal detected. What could of happened?


Re: Tektronix 492BP

 

Now I can heard a relay clicking and the external mixer lights glows. But I cant change the bands higher than the 15-21Ghz band, How can I get it to display the higher frequencies?


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

Michael W. Lynch
 

You can access the files on Google Drive and upload them to TekScopes.
Larry,
I will take care of that right now.
After review: they look like they are the latest versions on TEKSCOPES Files Section.

you can also find them here:

https://groups.io/g/TekScopes/files/Tek%20TM500%20Power%20Module%20Tester%20067-1201-99%20New%20Ver.

If anyone finds that these are NOT the latest file please let me know or upload the correct files from the google drive.
--
Michael Lynch
Dardanelle, AR


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

Michael W. Lynch
 

On Fri, Jan 15, 2021 at 05:07 PM, Larry McDavid wrote:


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,

I will take care of that right now.

--
Michael Lynch
Dardanelle, AR


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

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