Date   

Re: Serial numbers on 2465, 2465A and 2465B

victor.silva
 

This is clearly answered in the service manual available for free online.
Right in the beginning of the parts list for Assembly A1 there is a serial number range for each revision.
The 2465. 2465A and 2465B all start at B010...., so no your 2465 is no newer than your 2465B.

A quick look at the date codes on devices would confirm that also.
S/Ns for Beaverton units are "B0..." not "BO..."

--Victor


Re: Troubleshooting a TM500 series plugin

 

Hi Ernesto,
You do us all a disservice by quoting a $730 price for an extender. Anyone can put a ridiculous price on anything they want in their auction listing. Unfortunately some people don't understand this and assume eBay is to blame. EBay had nothing to do with it.

A more responsible thing to do is to look at the completed listings for a few months in a row to see what buyers ARE willing to pay on average for a typical extender. In that case you would find the actual selling price is most likely to be $200 to $250. And if you are a smart, patient bidder who checks the listings frequently you can sometimes snatch one as soon as it is listed for as little as $150.

$150 may not be affordable by many people but it far more REALISTIC than the $730 you quoted.

I agree it can be very satisfying to come up with your own "free" solution if you don't have an extender or can't afford one. The ancient Greek philosopher Plato first said it perfectly: "Necessity is the mother of invention".

Dennis Tillman W7pF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Ernesto
Sent: Thursday, April 16, 2020 1:49 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Troubleshooting a TM500 series plugin

Hi Dennis,

Thank you for the information. Yes, I should have used the "search" feature of the forum I will do this first next time.
Fortunately, the solution of striping the covers off a TM-500 rack (or the supply section from the back?) is quite satisfactory and one gets access to the whole plugin.

Now my mind is on possible repairs of 7000 scope plugins. I already found your post in thread "7A24 Channel 2 issues" where you recommended the access to the plugin through an empty bay in a multi-bay scope. I have a four bay scope (7704) and I will always find one or two empty bays besides the plugin under test. In this way, it is always possible to bring out test leads from points of interest. This can imply many plugging-in, plugging-out, but it beats paying $730 for a plugin extender, ha ha. (it's not the money, it's the satisfaction of working around a problem)





--
Dennis Tillman W7PF
TekScopes Moderator


Re: Serial numbers on 2465, 2465A and 2465B

robert Johnson
 

thank you great info I wanted to add I bought some of the safety caps on the input of the 2445b scope so if anyone needs any get back to me 
bob

On Friday, April 17, 2020, 10:32:33 AM EDT, stevenhorii <sonodocsch@gmail.com> wrote:

Some additional information from the earlier Tek group. The letter is
manufacturing location, but here are some other letters besides “B”: The
first digit if there is no letter is the location of manufacture.

wrote:

Hi all
Tek used serial numbers to identify manufacturing sites
100XXXX was UK/Guernsey
200000 was Japan
700000 was Herinveen in Holland (excuse the spelling)
BXXXXXX was Beaverton
MYXXXX was Malaysia (TAS200 series)
CXXXXXX is China (TDS200,1000,2000 series)
TWXXXX was Taiwan (Classroom series)
HKXXXXX was Hong Kong (DMM's)
There were a few others including limited production kits in Brazil

and

India.
Regards
Denis Cobley

Denis, I think you are mistaken in some of these S/N series. Unless I
am too, 100XXX was Guernsey, 200XXX and E200XXX was UK, 300XXX (and
possibly J300XXX) was Japan, 700XXX and H700XXX was Heerenveen.
/Zenith, Sweden

On Fri, Apr 17, 2020 at 10:23 stevenhorii via groups.io <sonodocsch=
gmail.com@groups.io> wrote:

There was an explanation in the older Tek group about Tek serial numbers.
There is (or was) no correlation with manufacturing date. Apparently, the
“B” stands for “Beaverton” (where made). The two digits following are for
changes to design within the same series followed by consecutive numbers,
so “B000001” would be the first production of an instrument line.
“B0100001” would be the first instrument in the first modification of that
same instrument line. You can find the original description if you search
“Tektronix serial numbers” in Google and look for the older “groups.io”
reply to this question. The author of it says that modifications could flip
the “5th digit”, but that would be counting from the least significant
digit in the number, not from the most significant.

I agree that looking at code dates is likely the best way to estimate
manufacturing date (unless parts have been replaced, but that should be
evident, except for socketed parts).

Steve H



On Fri, Apr 17, 2020 at 09:42 Lawrance A. Schneider <
llaassllaaass@gmail.com>
wrote:

When Tektronix started making 2465s, there must have started with an
original serial number; I'm sure I'm wrong, but let's say BO00001.  Then
they started making 2465As.  Did they again start at let's say BO00001 or
did they continue at what ever the last 2465 serial number happened to
be.
Or, did they make all three models until the very last unit and keep the
serial numbers separate relative to each individual line.

Why do I ask?  My 2465B # is BO14xxx.  My 2465 # is BO24xxx.  Thus, is my
2465 newer than my 2465B?  I'm following a seaming policy of not giving
the
full serial number - I don't know why that seems to be the convention.
Clearly my 'push buttons' on the 2465B are different than the 'toggle
switches' on my 2465.

Thanks,          larry






Re: Possible source for 1502 20mA tunnel diodes

Paul Amaranth
 

This is the reference I found:

https://www.eevblog.com/forum/chat/tektronix-1502-tdr/

This is also referenced in the tekwiki:
w140.com/tekwiki/wiki/1502

If you look up the Russian tunnel diode specs on the Tekwiki:
http://w140.com/tekwiki/wiki/Russian_tunnel_diodes

The 308J diodes have an Ifc of 8mA while the 308E variant is 20mA.
The J part is quite easy to find however.

Generally, if you blow the 20mA diode you have yourself a
small doorstop. This is the only part I know of that is
remotely close to a replacement. I haven't actually tried
this myself because a) my 1502 works and b) I haven't
been able to find any to this point.

Paul

Have you been able to verify that they actually work as expected ?

About 5 years ago I was fixing a 1502 for a friend and I purchased a lot of two
NOS GI308J/1I308J from a seller in Moldova at $36 plus shipping.
It turned out that they did work but with a pulse rise time not even close to the original.

/Håkan





!DSPAM:5e99d45a54781548557725!
--
Paul Amaranth, GCIH | Manchester MI, USA
Aurora Group of Michigan, LLC | Security, Systems & Software
paul@AuroraGrp.Com | Unix & Windows


Re: Serial numbers on 2465, 2465A and 2465B

Lawrance A. Schneider
 

I thank everyone having replied. I'm sorry did not find my answer in archives; guess I needed to look harder.

Again thank you all, larry


Re: Possible source for 1502 20mA tunnel diodes

 

On Fri, Apr 17, 2020 at 04:03 PM, Paul Amaranth wrote:

I've located a possible source for the Russian replacement for
the 20mA tunnel diode used in the 1502. This is the 1i308E
which I've been looking for, on and off, for a few years.

The Ai201V 10mA replacement is relatively easy to find, but
the 1i308E/Gi308E are very scarce.
Have you been able to verify that they actually work as expected ?

About 5 years ago I was fixing a 1502 for a friend and I purchased a lot of two
NOS GI308J/1I308J from a seller in Moldova at $36 plus shipping.
It turned out that they did work but with a pulse rise time not even close to the original.

/Håkan


Re: Any Tektronix magnetic shield for a CRT? A strange problem...

lilacbarn
 

Hi Ernesto.
That is strange.

I just "replied to sender" on the bottom of the post, really because my
query was a bit 'off topic" for the Tekscopes group.
Maybe your email address in this group has changed or is incorrect.
It shows up as "ebordon at swbell dot net" on my outgoing mail.
Anyway to save further problems (and I hope the group does not think it
cluttering the site) I will re-post it below:
--------------------------------------------------
Hi Ernesto, I am looking for a similar solution for my old Heathkit
oscilloscope.
It picks up a lot of noise from what I think is the mains transformer
leakage fields (magnetic)
But I also think there is some e-field coupling into the high impedance
lines.
You said you purchased some EMR magnetic shielding.
What product number was it? was it their WMF-300 product?
When you wrapped it around the neck of the tube, how far up the bulb to the
front (display)did you go? Did you ask for a special length as I see it is
sold by the foot?
If your tube widens, was it easy to form to the non-cyclindrical shape?
How did you hold it onto the tube?
Do think that the E-Field products would help (like the 100dB fabrics they
display?
Thanks for your comments.
Geoff


1502 vs 1502B 1502C

John Griessen
 

The cheap old 1502 is the fastest, best for a few centimeters to a few meters right?


Re: Serial numbers on 2465, 2465A and 2465B

stevenhorii
 

Some additional information from the earlier Tek group. The letter is
manufacturing location, but here are some other letters besides “B”: The
first digit if there is no letter is the location of manufacture.

wrote:

Hi all
Tek used serial numbers to identify manufacturing sites
100XXXX was UK/Guernsey
200000 was Japan
700000 was Herinveen in Holland (excuse the spelling)
BXXXXXX was Beaverton
MYXXXX was Malaysia (TAS200 series)
CXXXXXX is China (TDS200,1000,2000 series)
TWXXXX was Taiwan (Classroom series)
HKXXXXX was Hong Kong (DMM's)
There were a few others including limited production kits in Brazil

and

India.
Regards
Denis Cobley

Denis, I think you are mistaken in some of these S/N series. Unless I
am too, 100XXX was Guernsey, 200XXX and E200XXX was UK, 300XXX (and
possibly J300XXX) was Japan, 700XXX and H700XXX was Heerenveen.
/Zenith, Sweden

On Fri, Apr 17, 2020 at 10:23 stevenhorii via groups.io <sonodocsch=
gmail.com@groups.io> wrote:

There was an explanation in the older Tek group about Tek serial numbers.
There is (or was) no correlation with manufacturing date. Apparently, the
“B” stands for “Beaverton” (where made). The two digits following are for
changes to design within the same series followed by consecutive numbers,
so “B000001” would be the first production of an instrument line.
“B0100001” would be the first instrument in the first modification of that
same instrument line. You can find the original description if you search
“Tektronix serial numbers” in Google and look for the older “groups.io”
reply to this question. The author of it says that modifications could flip
the “5th digit”, but that would be counting from the least significant
digit in the number, not from the most significant.

I agree that looking at code dates is likely the best way to estimate
manufacturing date (unless parts have been replaced, but that should be
evident, except for socketed parts).

Steve H



On Fri, Apr 17, 2020 at 09:42 Lawrance A. Schneider <
llaassllaaass@gmail.com>
wrote:

When Tektronix started making 2465s, there must have started with an
original serial number; I'm sure I'm wrong, but let's say BO00001. Then
they started making 2465As. Did they again start at let's say BO00001 or
did they continue at what ever the last 2465 serial number happened to
be.
Or, did they make all three models until the very last unit and keep the
serial numbers separate relative to each individual line.

Why do I ask? My 2465B # is BO14xxx. My 2465 # is BO24xxx. Thus, is my
2465 newer than my 2465B? I'm following a seaming policy of not giving
the
full serial number - I don't know why that seems to be the convention.
Clearly my 'push buttons' on the 2465B are different than the 'toggle
switches' on my 2465.

Thanks, larry






Re: Serial numbers on 2465, 2465A and 2465B

Chuck Harris
 

Tektronix made it a policy to start each model of a
Beaverton made instrument at: B010001

They did this to cause total and utterly impenetrable
confusion to their competitors over the total number of
instruments they made... BWAHA HAH HAH HAAAAA!

That means that the serial number ranges are only unique to
an instrument model number.

The first 2465 was B010001, the first 2465A was B010001, ...

But, theie policy differed for the non US located factories.

Again the serial number ranges were unique to an instrument
model number, but they started at 1 + the factory identifier
number or letter, or number and letter....

-Chuck Harris

Lawrance A. Schneider wrote:

When Tektronix started making 2465s, there must have started with an original serial number; I'm sure I'm wrong, but let's say BO00001. Then they started making 2465As. Did they again start at let's say BO00001 or did they continue at what ever the last 2465 serial number happened to be. Or, did they make all three models until the very last unit and keep the serial numbers separate relative to each individual line.

Why do I ask? My 2465B # is BO14xxx. My 2465 # is BO24xxx. Thus, is my 2465 newer than my 2465B? I'm following a seaming policy of not giving the full serial number - I don't know why that seems to be the convention. Clearly my 'push buttons' on the 2465B are different than the 'toggle switches' on my 2465.

Thanks, larry




Re: Serial numbers on 2465, 2465A and 2465B

stevenhorii
 

There was an explanation in the older Tek group about Tek serial numbers.
There is (or was) no correlation with manufacturing date. Apparently, the
“B” stands for “Beaverton” (where made). The two digits following are for
changes to design within the same series followed by consecutive numbers,
so “B000001” would be the first production of an instrument line.
“B0100001” would be the first instrument in the first modification of that
same instrument line. You can find the original description if you search
“Tektronix serial numbers” in Google and look for the older “groups.io”
reply to this question. The author of it says that modifications could flip
the “5th digit”, but that would be counting from the least significant
digit in the number, not from the most significant.

I agree that looking at code dates is likely the best way to estimate
manufacturing date (unless parts have been replaced, but that should be
evident, except for socketed parts).

Steve H



On Fri, Apr 17, 2020 at 09:42 Lawrance A. Schneider <llaassllaaass@gmail.com>
wrote:

When Tektronix started making 2465s, there must have started with an
original serial number; I'm sure I'm wrong, but let's say BO00001. Then
they started making 2465As. Did they again start at let's say BO00001 or
did they continue at what ever the last 2465 serial number happened to be.
Or, did they make all three models until the very last unit and keep the
serial numbers separate relative to each individual line.

Why do I ask? My 2465B # is BO14xxx. My 2465 # is BO24xxx. Thus, is my
2465 newer than my 2465B? I'm following a seaming policy of not giving the
full serial number - I don't know why that seems to be the convention.
Clearly my 'push buttons' on the 2465B are different than the 'toggle
switches' on my 2465.

Thanks, larry




Possible source for 1502 20mA tunnel diodes

Paul Amaranth
 

I've located a possible source for the Russian replacement for
the 20mA tunnel diode used in the 1502. This is the 1i308E
which I've been looking for, on and off, for a few years.

The Ai201V 10mA replacement is relatively easy to find, but
the 1i308E/Gi308E are very scarce.

If anyone is interested in one or more of these, drop me a
note OFF LIST. If I get sufficient interest, I'll purchase
the lot and serve as a middleman. They're not cheap and the
price would be $12 each + $2 shipping. These are new surplus
parts, but there is some risk of course, although I may be able
to verify them on a curve tracer for a buck or two more. I will
need interest in 35 for this to be viable. I think the max
would be around 45, so the queue would be FIFO. US and Canada
only, please.

If I do not get enough interest, I'll pick up a few for
myself and publish the contact info and whoever wants one
can try for themselves.

Email is in the sig. Let me know in the next couple of days.
No money at this point, just let me know if you would be
interested.

Paul
--
Paul Amaranth, GCIH | Manchester MI, USA
Aurora Group of Michigan, LLC | Security, Systems & Software
paul@AuroraGrp.Com | Unix & Windows


Re: Serial numbers on 2465, 2465A and 2465B

Colin Herbert
 

A similar question was asked some time ago and Dave of Artek Manuals stated that there was no correlation between serial-numbers and the dates of manufacture. Date-codes on components is the best way to find out when a piece of Tek test-gear was manufactured, apparently.
Colin

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Lawrance A. Schneider
Sent: 17 April 2020 14:43
To: TekScopes@groups.io
Subject: [TekScopes] Serial numbers on 2465, 2465A and 2465B

When Tektronix started making 2465s, there must have started with an original serial number; I'm sure I'm wrong, but let's say BO00001. Then they started making 2465As. Did they again start at let's say BO00001 or did they continue at what ever the last 2465 serial number happened to be. Or, did they make all three models until the very last unit and keep the serial numbers separate relative to each individual line.

Why do I ask? My 2465B # is BO14xxx. My 2465 # is BO24xxx. Thus, is my 2465 newer than my 2465B? I'm following a seaming policy of not giving the full serial number - I don't know why that seems to be the convention. Clearly my 'push buttons' on the 2465B are different than the 'toggle switches' on my 2465.

Thanks, larry


Re: Serial numbers on 2465, 2465A and 2465B

Lawrance A. Schneider
 

Not being very smart, I'll add to my query.

My 2465B is a 2465BDM. Mt 2465 is a'plain vintage' type of scope. i.e. no add ons. Does that have meaning relative to serial numbers?

Again thanks, larry


Serial numbers on 2465, 2465A and 2465B

Lawrance A. Schneider
 

When Tektronix started making 2465s, there must have started with an original serial number; I'm sure I'm wrong, but let's say BO00001. Then they started making 2465As. Did they again start at let's say BO00001 or did they continue at what ever the last 2465 serial number happened to be. Or, did they make all three models until the very last unit and keep the serial numbers separate relative to each individual line.

Why do I ask? My 2465B # is BO14xxx. My 2465 # is BO24xxx. Thus, is my 2465 newer than my 2465B? I'm following a seaming policy of not giving the full serial number - I don't know why that seems to be the convention. Clearly my 'push buttons' on the 2465B are different than the 'toggle switches' on my 2465.

Thanks, larry


Re: Troubleshooting a TM500 series plugin

NigelP
 

Problem with this method is that you can't easily roll the unit around to get probe access without having the possibility (probability?) that the PI will fall out of the connector.... Bad news.

So what I did, since I had a "spare" TM502, is to cut out big slots in either side of the TM502 casing so that the PI stays in exactly as it was intended and you have a pretty good access to most bits. The only bit to be careful of is to ensure you remove case metal as close as possible to the front frame so that you can get the most access to the rear of the PI front panel.

If anyone is interested I can provide the dimensions of the holes I cut out.

I suppose if you don't want to cut holes in the casing another idea is to make some kind of temporary lashing (massive ty-wrap etc) around the PSU and the PI back-panel until your repair work is completed.

I actually got this idea from some 7000 mainframes I have that had been used by Tek-UK Service Department for exactly the same purpose..... now I want to get some complete 7904A side panels to get rid of the holes!!!! Well at least there is plenty of fresh air getting into my 7904A!

Regards

Nigel G8AYM


Re: Extenders For 7000 series Plugins (correction)

 

Ignacio and others,
Please keep any communication with John Griessen regarding the items you want to buy off TekScopes.
8,000 other members of TekScopes were copied on this message unnecessarily.
Dennis Tillman W7pF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of EB4APL
Sent: Thursday, April 16, 2020 6:21 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Extenders For 7000 series Plugins (correction)

Hi John,
Could you send a board and a female connector for making an extender to Spain?
Regards,
Ignacio EB4APL



--
Dennis Tillman W7PF
TekScopes Moderator


Re: Tek 465B parts for sale

exojam825@...
 

To the gentleman who enquirers day about the probes, I apologize but I do not ship to Canada. I tried to e-mail you but it bounced backed.


2465B. Focus Problem

Craig Cramb
 

Looking at an issue on a Pre 50,000 Serial number 2465B unit.

Seems that the trace focus is vey good. But the cursors and display text are not as sharp.
During the CRT Cal08 adjustment procedures step 3 focus of the trace is very good but the cursors dots are in line but instead of a well defined dot they look like a small bubble. Alignment is also good. Step 3 item H. Moving the cursors to the 1st and 11th graticule alignment is also good but toward the top and bottom of the cursors instead of dots the look like small feathers. I complete the cal08 and trace is very well defined and the readout is a little blurry. As I reduce the readout intensity focusing will get very good just before the off position. So Nothing major just trying to get better defined readout at a brighter setting.
Any thoughts well appreciated.

Craig


Re: Extenders For 7000 series Plugins (correction)

EB4APL
 

Hi John,

Could you send a board and a female connector for making an extender to Spain?

Regards,

Ignacio EB4APL

El 17/04/2020 a las 3:11, John Griessen escribió:
On 4/16/20 7:54 PM, George Livanes wrote:
Would any of the members have the Gerber files, to make PCB's
  for the male ends of 7000 series extenders ?
Sure, the files for these are available, and plenty of the actual boards also...
just not all the connectors for the kits.

https://www.ecosensory.com/tek/TEK_7K_FLEX_production-board-2.jpg
https://www.ecosensory.com/tek/TEK_7K_FLEX_production-board-3.jpg

I can send a pair of boards for $15 + $3 ship.  Just for this month.  The usual price is $22 for bare pcbs.

--
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