Date   

Where to find a serial number on a 335 Sony/Tektronix

Phillip Potter
 

Hi all,

I searched to exterior, and the interior, but could not find a SN for my 335.

The reason for the search is, I have two 335 manuals a want to figure out which one to keep.  One has part number 070-1943-*00 *and the other is 070-1943-01. I figured that I would need the SN to tell which manual is more appropriate.

I did see that there was a date of 1973 on the etching on a board inside, so that gets me closer.  BUT, still no joy!

Thanks,

Phil


Re: What can you do with a 1502?

Harvey White
 

On Tue, 27 Feb 2018 16:57:17 -0500, you wrote:

I pulled a 1502 TDR out of the buck a pound box at Dayton a few years back
and finally got it completely fixed the other week. I had to fab a
battery pack and then fix the charging circuitry, but otherwise it
was fine.

You are quite lucky. The tunnel diode is very fragile and directly
connected to the BNC. (I'm thinking of the 1502, not sure about the
later revisions). There should be a shorting BNC connector that needs
to be on at all times unless you're doing a measurement.

The tunnel diode can be damaged by DC (a typical damage scenario) or
by RF transmitted into the TDR.

The 1503 is harder to damage, doesn't use a tunnel diode, has a
different presentation on the screen, but is for cables about 10x
longer.



Turned out I had an immediate need for it to measure how much coax I
had left on a roll (answer: exactly enough to do a job). Pretty handy
getting an answer without having to string the cable or unrolling
the entire reel and finding out I'm a foot short.

Anyone have any neat applications for one of these, other than the
obvious ones of finding cable breaks and identifying where connectors are?
Determining the velocity factor of the cable, for one. I think you
can also determine the impedance of a cable as well.

Again, be really careful with this, simply because the tunnel diode is
unobtainable (period, sincerely yours, etc....). There *may* be a
Russian equivalent, but I've not heard of one offhand.

Mine needed battery packs, too.

Harvey


Re: What can you do with a 1502?

 

Hi Paul,
It has lots of uses. Get the Tek book Time Domain Reflectrometry
Measurements for insights.

I use it to test every cable, connector, and adapter I buy from ham fests
the Chinese, and anyone else. It doesn't go into my drawer until I confirmed
it is stable, the connections are sound, and the impediance is 50 Ohms (or
not more than 53 ohms if you are dealing with RG-53.

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Paul
Amaranth
Sent: Tuesday, February 27, 2018 1:57 PM
To: TekScopes@groups.io
Subject: [TekScopes] What can you do with a 1502?

I pulled a 1502 TDR out of the buck a pound box at Dayton a few years back
and finally got it completely fixed the other week. I had to fab a battery
pack and then fix the charging circuitry, but otherwise it was fine.

Turned out I had an immediate need for it to measure how much coax I had
left on a roll (answer: exactly enough to do a job). Pretty handy getting
an answer without having to string the cable or unrolling the entire reel
and finding out I'm a foot short.

Anyone have any neat applications for one of these, other than the obvious
ones of finding cable breaks and identifying where connectors are?

--
Paul Amaranth, GCIH | Rochester MI, USA
Aurora Group, Inc. | Security, Systems & Software
paul@... | Unix & Windows




--
Dennis Tillman W7PF
TekScopes Moderator


Re: Problems with MG Chemicals Super Contact Clearer

 

Hi Stan,
I had the same problem just yesterday on a new MG Chemicals Super Contact Cleaner I bought.
On my own I figured that I would have more success by removing the nozzle.
That was the case, but it was not enough.
Next I grabbed the spray tube with a pair of pliers close to the end that I wanted in the nozzle.
Eventually I started twisting as I was applying downward pressure on the spray tube.
The nozzle was on the desk so it couldn't move. That made it easy to hold under the pressure from the Spray tube.
It did go in after a struggle. The nice thing about this after I got it inserted is "that sucker ain't never coming out". It was satisfying when I thought about how many spray tubes have fallen out of their nozzles and I realized that MG Chemicals came up with a solution at last.

MG Chemicals I have some advice for you: Beware of unintended consequences.

Perhaps if you created a short YouTube video showing how it's done your customer's would appreciate it more.

STAN: If you send me your nozzle and spray tube I think I can put them together for you. Contact me off list for my address.

Dennis Tillman W7PF
PS I have no relationship with MG Chemicals

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of brasscat
Sent: Tuesday, February 27, 2018 12:53 PM
To: TekScopes@groups.io
Subject: [TekScopes] Problems with MG Chemicals Super Contact Clearer

Hello the forum,

Relevance to Forum, it is used in cleaning switches in Tektronix equipment.

I bought a can of this product, 801B-125G. The spray tube just will not insert. Like many of you, I have inserted these spray tubes over the years.
I contacted the dealer, they take no responsibility, said contact MG Chemical.
So I did.

--- EMAIL ----------------------------------------------------------------------------------------------------
Hello Mg Chemicals,

I have now purchased a second spray can of your SUPER CONTACT CLEANER 801B-125G.
I bought the second can from a different seller, intending to return the first can!!
The red spray tube DOES NOT FIT INTO THE NOZZLE!! This second can has the SAME PROBLEM!

I am in my 60's and worked as electronic / microcomputer engineer 3 decades. I have used may sprays, and inserted many spray tubes. Yes, it needs to be a snug fit. But these red spray tubes are not inserting, if I use any more force it would damage the tube. I see no instructions showing some SPECIAL method to insert the tube.

Since these two cans came from different suppliers, this problem is a bigger problem.

Please help.
--- FORUM -----------------------------------------------------------------------------------------

Well, they responded
--- RESPONSE ------------------------------------------------------------------------------------
Hello Stan,

I do apologize for inconvenience this has caused. The easy way to do fit it in is to take the nozzle out first. Secondly, hold the nozzle upright with one hand and the other hand with tube. Make sure to angle the tube about 45 degrees downwards as you adjust the fit. Apply gentle force and it should fit in without any issue. I just tried few cans and it worked. Do not hesitate if you have any questions.


Regards,

Titus Cheruiyot, B.S.E.E,M.ENG

-- ME TO FORUM --------------------------------------------------------------------------------

It did not work. I have sent another email

-- EMAIL AGAIN -----------------------------------------------------------------------------------

Hello Titus Cheruiyot, thanks for your reply.

Never having had to used this procedure, I gave it a try, I take it that to "hold the nozzle upright" to mean to align the receiving cylindrical opening so its center line (axis) is vertically aligned. an inserted spray tube would stand upright.
Then position the spray tube with its axis at a 45 deg to the nozzle axis, and insert. A gentle force!

IT DOES NOT INSERT. IT WILL NOT GO IN.

I decided to "scrapped" it's end a bit, if I screw up I can just cut with exacto knife 1/2" with little loss of tube length. I did not "cut" or "shave" off material. I "scrapped" off a tiny amour all the way around the circumference. Using the blade in a negative rake (lathe term). It is "dragging"
the blade instead of pushing the blade into the material. This removes a very thin amount.

Now I inserted it with difficulty, not sure how well it will stay inserted. Perhaps I should glue it?

This makes me think something is wrong here.

1> Was there a production lot of defective spray tubes or nozzles?
2> Are there counterfeits of this product?

I sure would like a nozzle and spray tube that are working correctly. This spray cleaner is highly respected, and it costs a fair amount also!

I am going to post this questions on a couple of electronic / test equipment forums.

Sincerely, Stan Krumme

-- TO FORUM --------------------------------------------------------------------------------------------

So, Am I the only one having this problem, anyone else have this problem??

Thanks, Stan



--
Dennis Tillman W7PF
TekScopes Moderator


What can you do with a 1502?

Paul Amaranth
 

I pulled a 1502 TDR out of the buck a pound box at Dayton a few years back
and finally got it completely fixed the other week. I had to fab a
battery pack and then fix the charging circuitry, but otherwise it
was fine.

Turned out I had an immediate need for it to measure how much coax I
had left on a roll (answer: exactly enough to do a job). Pretty handy
getting an answer without having to string the cable or unrolling
the entire reel and finding out I'm a foot short.

Anyone have any neat applications for one of these, other than the
obvious ones of finding cable breaks and identifying where connectors are?

--
Paul Amaranth, GCIH | Rochester MI, USA
Aurora Group, Inc. | Security, Systems & Software
paul@... | Unix & Windows


Re: 7623A + 7A26 + 7B53

Fabio Trevisan
 

Thank you all guys, for the advice...

David... any particular reason why you specified "and the TB triggers OK"?

I mean... the video that the owner posted...(here:
https://www.youtube.com/watch?v=L6RDLs3xzxc&t=10s)
indeed doesn't show it triggering... but I`m just assuming he doesn't know
how to do it.

I hope I didn't assume too much... I already bought it.

What does the 7B53A uses for triggering? Tunnel Diodes?

Rgrds,

Fabio

2018-02-27 18:15 GMT-03:00 David C. Partridge <@perdrix

:
If it powers on and works and the TB triggers OK, than just buy it.

Dave

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Fabio
Trevisan
Sent: 27 February 2018 18:27
To: TekScopes@groups.io
Subject: [TekScopes] 7623A + 7A26 + 7B53

Hello folks,
I`m having a chance to acquire a 7623A + 7A26 + 7B53A combination.
Since I will have little chance to check it onsite I would like to ask you
experts, if there is any known quirks or component that fails or break
often, that I need to be more concerned?
What do you think of the combination?
Thanks for your thoughts,
Fabio





Re: 7623A + 7A26 + 7B53

 

If it powers on and works and the TB triggers OK, than just buy it.

Dave

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Fabio Trevisan
Sent: 27 February 2018 18:27
To: TekScopes@groups.io
Subject: [TekScopes] 7623A + 7A26 + 7B53

Hello folks,
I`m having a chance to acquire a 7623A + 7A26 + 7B53A combination.
Since I will have little chance to check it onsite I would like to ask you experts, if there is any known quirks or component that fails or break often, that I need to be more concerned?
What do you think of the combination?
Thanks for your thoughts,
Fabio


Re: 7623A + 7A26 + 7B53

Dave Voorhis
 

I have a 7623 (not A) + 7A26 + 7B53A and I have no real complaints, though the mainframe could probably do with some attention to cure a minor display instability — probably due to dirty or loose contacts somewhere — and to correct a tendency for the readout to drift from offscreen to onscreen over several minutes as it warms up. Sometimes the readout stops working entirely for a few minutes — or doesn’t come up immediately on startup — but it always comes back after a little while. This too is probably dirty or loose contacts.

When I got it, the mainframe switches were sticky to the point of being unusable, but were easily freed with careful (to avoid melted plastic) application of Servisol switch cleaner. I don’t know if this is a common problem, or from use or storage in a dusty and sooty environment.

I’ve heard of problems with burn-in on storage CRTs and that the chances of finding an unburnt one are slim — I think you can check by switching to storage mode and painting the whole display with the trace — though unless I’m misunderstanding something, both my analog storage scopes, the 7623 and a 549, appear to be burn-free. To keep it that way, I’m careful to use storage mode sparingly, with as low brightness as possible and only briefly.

On 27 Feb 2018, at 18:26, Fabio Trevisan <fabio.tr3visan@...> wrote:

Hello folks,
I`m having a chance to acquire a 7623A + 7A26 + 7B53A combination.
Since I will have little chance to check it onsite I would like to ask you
experts, if there is any known quirks or component that fails or break
often, that I need to be more concerned?
What do you think of the combination?
Thanks for your thoughts,
Fabio


Problems with MG Chemicals Super Contact Clearer

brasscat
 

Hello the forum,

Relevance to Forum, it is used in cleaning switches in Tektronix equipment.

I bought a can of this product, 801B-125G. The spray tube just will not
insert. Like many of you, I have inserted these spray tubes over the years.
I contacted the dealer, they take no responsibility, said contact MG Chemical.
So I did.

--- EMAIL ----------------------------------------------------------------------------------------------------
Hello Mg Chemicals,

I have now purchased a second spray can of your SUPER CONTACT CLEANER 801B-125G.
I bought the second can from a different seller, intending to return the first can!!
The red spray tube DOES NOT FIT INTO THE NOZZLE!! This second can has the SAME PROBLEM!

I am in my 60's and worked as electronic / microcomputer engineer 3 decades. I have used may
sprays, and inserted many spray tubes. Yes, it needs to be a snug fit. But these red spray
tubes are not inserting, if I use any more force it would damage the tube. I see no instructions
showing some SPECIAL method to insert the tube.

Since these two cans came from different suppliers, this problem is a bigger problem.

Please help.
--- FORUM -----------------------------------------------------------------------------------------

Well, they responded
--- RESPONSE ------------------------------------------------------------------------------------
Hello Stan,

I do apologize for inconvenience this has caused. The easy way to do fit it in is to take the nozzle out first. Secondly, hold the nozzle upright with one hand and the other hand with tube. Make sure to angle the tube about 45 degrees downwards as you adjust the fit. Apply gentle force and it should fit in without any issue. I just tried few cans and it worked. Do not hesitate if you have any questions.


Regards,

Titus Cheruiyot, B.S.E.E,M.ENG

-- ME TO FORUM --------------------------------------------------------------------------------

It did not work. I have sent another email

-- EMAIL AGAIN -----------------------------------------------------------------------------------

Hello Titus Cheruiyot, thanks for your reply.

Never having had to used this procedure, I gave it a try,
I take it that to "hold the nozzle upright" to mean to align the receiving cylindrical opening
so its center line (axis) is vertically aligned. an inserted spray tube would stand upright.
Then position the spray tube with its axis at a 45 deg to the nozzle axis, and insert. A gentle force!

IT DOES NOT INSERT. IT WILL NOT GO IN.

I decided to "scrapped" it's end a bit, if I screw up I can just cut with exacto knife 1/2" with little
loss of tube length. I did not "cut" or "shave" off material. I "scrapped" off a tiny amour all the
way around the circumference. Using the blade in a negative rake (lathe term). It is "dragging"
the blade instead of pushing the blade into the material. This removes a very thin amount.

Now I inserted it with difficulty, not sure how well it will stay inserted. Perhaps I should glue it?

This makes me think something is wrong here.

1> Was there a production lot of defective spray tubes or nozzles?
2> Are there counterfeits of this product?

I sure would like a nozzle and spray tube that are working correctly. This spray cleaner is
highly respected, and it costs a fair amount also!

I am going to post this questions on a couple of electronic / test equipment forums.

Sincerely, Stan Krumme

-- TO FORUM --------------------------------------------------------------------------------------------

So, Am I the only one having this problem, anyone else have this problem??

Thanks, Stan


Re: 7623A + 7A26 + 7B53

Bert Haskins
 

On 2/27/2018 1:26 PM, Fabio Trevisan wrote:
Hello folks,
I`m having a chance to acquire a 7623A + 7A26 + 7B53A combination.
Since I will have little chance to check it onsite I would like to ask you
experts, if there is any known quirks or component that fails or break
often, that I need to be more concerned?
What do you think of the combination?
Thanks for your thoughts,
Fabio

I have the same combination along with a big bunch of other plugins.
This is a one setup that I use quite often, sometimes with a non Tek curve tracer .
I have had this for many years and I think its finally trying to tell me that it's recap time.

--Bert


Re: 7623A + 7A26 + 7B53

Harvey White
 

On Tue, 27 Feb 2018 15:26:36 -0300, you wrote:

Hello folks,
I`m having a chance to acquire a 7623A + 7A26 + 7B53A combination.
Since I will have little chance to check it onsite I would like to ask you
experts, if there is any known quirks or component that fails or break
often, that I need to be more concerned?
What do you think of the combination?
Decent enough, although I'm not an owner of the 7600 series. Take two
or three BNC cables and a T. That ought to let you get a good view of
the calibrator waveform. Swapping slots is another good idea, of
course.

Fair amount can be told (gross failures) with just that, I think.

Check for bent shafts and the like, as well as noisy pots.



Harvey



Thanks for your thoughts,
Fabio



Re: TekWiki Helper Idea. Brainstorm or Washout?

 

Hi Kurt,
I can dig up the names of the designers of some of the Tek instruments. I may even be able to get in touch with some of them to see if they were willing to share the history of the instrument. Because some former Tek employees might prefer their privacy they would need to be contacted first to get permission to connect him/her with the TekWiki editor who has volunteered to take responsibility for that particular instrument.

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Kurt Rosenfeld
Sent: Monday, February 26, 2018 11:41 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] TekWiki Helper Idea. Brainstorm or Washout?

I agree that it would be great to have a list of options for each instrument. And I agree that the information is not easy to find.

I'm happy to make a Tekwiki account for anyone who emails me and requests an account. This formality is just to keep out the bots that post junk on wikis. (This has been a problem in the past.) Some people in the Tek community don't want to mess around with the wiki directly and, instead, tend to email me corrections and things to add. That's fine, too.

The 7603 page (http://w140.com/tekwiki/wiki/7603) is probably the best overall Tekwiki page, currently. Of course, it could be better in many ways (e.g., it lacks history about the instrument (e.g., who designed it), it lacks discussion of the circuitry, it lacks context in terms of how it compared with other models, etc). But it is pretty good with listing the options.






--
Dennis Tillman W7PF
TekScopes Moderator


Re: TDS540B Power On Self Test Pass, but changing results from SPC [Solved]

satbeginner
 

Hi all,

again an update on the repair of my TDS540B:

I was able to fix it!
Today the ChipQuik arrived, and that enabled me to remove the ADC from the donor board as well as from the board of my TDS540B
After cleaning the Acquisition board I carefully replaced the ADC.
Running the diagnostics and the SPC still gave errors, but the "DDataL stuck Hi" message was gone, so the outputs of the ADC were working again. :-)

Since I was was careful when replacing the ADC chip, so not too much solder to avoid shorts, it turned out I had several pins with no connection, so I was just a bit too careful.

After careful inspection with a magnifying glass I found all the pins that were missing their connection, and after soldering all these properly the scope was back in business !! :-)

I put up some more pictures in this album: https://groups.io/g/TekScopes/album?id=21745


Un saludo,

Leo


Re: TekWiki Helper Idea. Brainstorm or Washout?

Brian Bloom
 

I'd be willing to take on the 465 and 485 for starters and go from there.

I know this is solely for the options, and I know where to find those, but I'm quite curious where the MODS info is to be found. Would that be in the rear of the manuals under change information that is not specifically just corrections to the contents of the SM?
If so, I have a few pages worth on the 7854 - they're listed as 070-****-**

Brian


7623A + 7A26 + 7B53

Fabio Trevisan
 

Hello folks,
I`m having a chance to acquire a 7623A + 7A26 + 7B53A combination.
Since I will have little chance to check it onsite I would like to ask you
experts, if there is any known quirks or component that fails or break
often, that I need to be more concerned?
What do you think of the combination?
Thanks for your thoughts,
Fabio


Re: 7603 15+ rail dead. Options?

Dave Voorhis
 

Thanks, point(s) taken.

I’ve ordered appropriate discrete parts, should have the power supply working in a few days, and can then move on to other problems.

On 27 Feb 2018, at 03:31, dadhills@... wrote:

Is there any good reason why I can't simply obtain +15 v from a 2 amp 15 volt regulator chip — like an L78S15CS — and ignore the +15v sense line?>>
Three that I can think of.

First, you will disrupt the power-up sequences of the various DC supplies. Many IC's and discrete circuits don't like seeing positive
voltages before the negative rail comes up. May or may not be a problem, but you have to ask why the various regulators are sequenced as they are?
Second, what will happen to the calibration of your plug-ins when +15v is outside the limits of the original design and no longer tracks the -50v supply? Lastly,
+15v current limit, will something go @#poof--!! if your supply is not limited to the same value and function as the original?

Also, a thin layer of epoxy bonding together the flat sides of a pair of TO-92's is would be my choice over thermal compound.

Dave


Re: TekWiki Helper Idea. Brainstorm or Washout?

 

Hi Kurt,
WOW! The 7603 page is stunning. Where do you find the time to do all of this?

I would be happy to take charge of the 7854, 7A26, 7A24, 7A18, 7A16A, and the 7A25 (yes, I meant the 7A25) pages. With a little luck you will meet the designer of all of these on Saturday.

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Kurt Rosenfeld
Sent: Monday, February 26, 2018 11:41 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] TekWiki Helper Idea. Brainstorm or Washout?

I agree that it would be great to have a list of options for each instrument. And I agree that the information is not easy to find.

I'm happy to make a Tekwiki account for anyone who emails me and requests an account. This formality is just to keep out the bots that post junk on wikis. (This has been a problem in the past.) Some people in the Tek community don't want to mess around with the wiki directly and, instead, tend to email me corrections and things to add. That's fine, too.

The 7603 page (http://w140.com/tekwiki/wiki/7603) is probably the best overall Tekwiki page, currently. Of course, it could be better in many ways (e.g., it lacks history about the instrument (e.g., who designed it), it lacks discussion of the circuitry, it lacks context in terms of how it compared with other models, etc). But it is pretty good with listing the options.




--
Dennis Tillman W7PF
TekScopes Moderator


Re: 7603 working .... then blank

Roger Evans
 

Ian,

Delighted you have the scope fixed despite my best efforts to cause confusion. No, I am not a night owl, I live in the UK.

If you browse around here and elsewhere you will find the general recommendation when replacing tantalums with aluminium (UK spelling!) electrolytics to approximately double the capacitance to ensure low ESR so 2.2uF at 100V as and when you can get hold of one.

Enjoy your now working scope,

Roger


Re: Ceramic strip soldering tek video

Brendan
 

"A sure way to crack a strip is to tilt your iron." So I tilted my iron and cracked a strip. I watched the video about a week to late.


Re: 2465B Horizontal problem

Mlynch001
 

I bought a scope from Mr, Schonfeld as well. I have read some really shady
stories about him in this forum after I bought a scope, so this was a
concern for me. My purchase was a TDS360 and it was supposed to have new
NVRAM installed. The scope worked fine for some time after it arrived.
However,after a few hours of operation, the display quit working. I will
say that contrary to what many have said, I found that he responded and
solved my problem with a minimum of drama, up to and including replacing
the defective scope. I opened the original scope and found that he had
indeed done the work that I had originally bargained for (New NVRAM was in
place on a socket in the board), so this was a good sign. The work that he
did appeared to be very good, as far as I can visually determine. As far
as Making 2445's into 2465's, that is something that I am not in a position
to speak about. But I can say that my particular transaction with Mr.
Schonfeld was very satisfactory. I am breathing a big sigh of relief.



Michael Lynch
11993 Wildcat Hollow Rd.
Dardanelle, AR 72834


479-477-1115 Cell Phone
479-229-0126 Land Line

@mlynch001
@mlynch002

On Mon, Feb 26, 2018 at 9:56 AM, M Yachad <@yachadm> wrote:

[Edited Message Follows]

Project complete.
Replaced U700, and the trace came back to normal.
A BIG thanks for everyone's help!!!

Just an additional story here.
You all remember that I bought this scope from Alexander Schonfeld in
California (ebay username - 2465b), who up-modded the 2445B A1's frequency,
without telling the customers.

Well, I got in contact with him, and I suggested to him that the right
thing to do, would be to send me the new IC's free of charge.

He did, so I do say that the man is making amends in a small way, and I
appreciated that.