Date   
Re: Tek CRTs supplied to competing manufacturers

Greg Muir
 

George,

Do you or anyone else have a copy handy of "Winning with People; The first 40 years of Tektronix" to confirm this? I can’t seem to find my copy at the moment.

Thanks,

Greg

On 01-26-2018 at 12:55 pm George Gonzales wrote:
“I think it was the other way around. Tek used to buy CRTs from Dumont and RCA but found out they were getting below average CRTs….”

Re: 11801 questions - funny fan noise and light

 

Hi Ragnar,
Maybe Tek switched to these kinds of fans to make their instrument more
energy efficient.
With the heightened interest in being ecologically responsible many
companies, like Tektronix for example, have made a concerted effort to make
their equipment more efficient. Every watt used by any electronic device
ultimately ends up as heat that other machines (like fans and air
conditioners) have to remove. The engineers designing new equipment know the
savings that will come from every wasted watt they can eliminate result in a
savings of several watts. Temperature sensing fans save power by not running
at all until needed and then only running as fast and as long as necessary
to remove the heat from the instrument.

Dennis Tillman W7PF

-----Original Message-----
From: Ragnar S
Sent: Sunday, January 26, 2020 9:20 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] 11801 questions - funny fan noise and light

Thank you gentlemen for your replies!
So it is unclear if it is supposed to do this, but it is at least not
unheard of.

I checked the voltages on the feed wires to the fan relative chassis ground.
From start, the positive wire has about +6.3 V and the negative about +0.7
V.
When the fan revving occurs, the negative wire goes to about -6 V for about
35 ms, making a total voltage over the fan of about 12 V. For some reason
the pulses come irregularly, around 1 or a few times per second.

My current hypotheses is that the intention is to regulate the speed of the
fan, but I would be surprised if this actually is how it was designed to
work. It is somewhat annoying. :-)

Are there any schematics on these boxes to be found?

Also - the neon (?) light in the power supply, right behind the fan, that
starts to flicker as soon as it has power (also in standby mode) - do you
guys have that too?

Thanks for you help and best regards,

Ragnar

On 25 Jan 2020, at 16:01, Chuck Harris <cfharris@...> wrote:

Mine is normal until after the scope has been turned on for about 30
minutes, and then it starts going "Brummm..... Brummm..."

I suspect a capacitor failure, as it is annoying, and would have
caused notice if it were a "normal" condition.

Annoying, though it may be, I can't see how it would cause any harm...
unless it presages a total failure.

What it isn't is a bearing failure, or lack of lubrication. My fan
spins for what seems like half a minute after power is turned off.

-Chuck Harris

Reginald Beardsley via Groups.Io wrote:
I don't recall mine ever doing that. I'm very sensitive to noise as I
investigate anything I can't identify, so I think I would have noticed it.

A fan on one of my HP Z400 workstations was doing that. I shut it down
to reduce the heat in the room and when I tried to boot it the fan was dead.
I've not had time to correct it yet.

Good luck,
Reg



--
Dennis Tillman W7PF
TekScopes Moderator

FS: Tektronix 1140A load & current fixture

Brad Thompson
 

Hello--

I'm offering FS one only Tektronix model 1140A load and current-shunt fixture
That's in very good mechanical but unknown electrical condition and
hence is offered as-is.

The 1140A test fixture is designed  for calibrating 1140A [[[coincidence? I think not...]]]]
power supplies, but based on its schematic and operating manual as shown here...

http://w140.com/tekwiki/wiki/067-0764-00

...It's likely very useful for calibrating and troubleshooting other power supplies.

I'm asking $30.00 plus shipping cost.

Questions welcomed, PayPal honored.

Thanks, and 73--

Brad  AA1IP

Re: TDS3012B to TDS3052B upgrade

Tom B
 

Hello Håkan,

Thank you for the information.  I think this tells me what I want to know.   It is good to know that the hardware is all the same.

I also have a TDS2024 but I don't have any plans to change that one.

I don't own any calibration equipment so I don't think your software will do me any good.

Tom

On 1/26/2020 7:32 AM, zenith5106 wrote:
On Sun, Jan 26, 2020 at 04:55 AM, Tom B wrote:

I have seen a lot of postings from people who have upgraded the bandwidth of
their TDS3000 scopes with firmware.   I have a TDS3012B that I was thinking
about doing that with but it seems strange that you could go from 100MHz to
500MHz without any hardware changes.  What I want to know is; how well does
this work?  Are there any issues to watch out for?
I have done that upgrade on several TDS3000 scopes including my own TDS3014B. It works fine
and it does not need an adjustment after the change. It's done with GPIB. It can also be done on
TDS200 and TDS1000/2000 but they need a full adjustments sequence to be done.

I have written several softwares to do a Performance Check on most of the older TDS's and for
the TDS's mentioned above I included a procedure to change the type. Initially I had an idea to
charge a small fee for that specific function. I have later abandoned this idea but until the software
has been changed you will need to get a key from me.

Find it here: https://urldefense.com/v3/__http://www.hakanh.com/dl/TDS_pv.htm__;!!KfGNmQmE!yrE_0JSiIWARxe7y9YW-lbIqsXEU4CHzxS-GQGAYYzlbrLpDm40Tmx3YVrQn$

Re: Guernsey Island 2445

David DiGiacomo
 

On Sun, Jan 26, 2020 at 12:35 PM Chuck Harris <cfharris@...> wrote:

I am pretty sure that the last 5 digits between Guernsey
and Beaverton units are not unique, but rather, are sync'd
to each other so the change orders apply.

In other words, you can have a B012345 and an 8012345 scope,
and each will use the revisions specific to B012345.
There have been a few times when Håkan looked up the cross references
in the modification summaries, and the last 5 digits were not synced,
e.g.:

https://groups.io/g/TekScopes/message/60534

"In a very limited cross reference for mods B230000 corresponds to
108670 and B327100 to 110610 so I would say your Guernsey 7B53A
is the newest one."

Re: Guernsey Island 2445

 

On Sun, Jan 26, 2020 at 10:17 PM, Chuck Harris wrote:


The primary thing I was trying to relate is the last
5 digits determines which engineering change orders
apply to your instrument.
I'm pretty sure that's incorrect across serial numbers from different countries of manufacture, Chuck, but I'm happy to check and provide (dis)proof when I'm back in the lab...
Unless unwelcome signs of old age have set in, ISTR that's exactly what many of us (mostly non-US based) have had to deal with for years.
It is one unfortunate thing that I have never understood from Tek.

Raymond

Re: Guernsey Island 2445

 

On Sun, Jan 26, 2020 at 08:50 PM, n4buq wrote:


Did all the Guernsey serial numbers begin with 8? Mine has a six-digit serial
number that begins with 1.
As I wrote elsewhere, AFAIK no serial numbers starting with 8 exist and 1... means made in Guernsey.

Raymond

Re: Guernsey Island 2445

 

On Sun, Jan 26, 2020 at 08:35 PM, Chuck Harris wrote:


In other words, you can have a B012345 and an 8012345 scope,
and each will use the revisions specific to B012345.
I don't think that's the case:
AFAIK, no regular serial numbers starting with 8 exist
Numbers starting with B were US-made (Beaverton)
Numbers starting with 1 were Guernsey-made
Numbers starting with 2 were UK-made
Numbers starting with 3 were Japan made
Numbers starting with 7 and those with H were Heerenveen made
I've been told that sometimes, letter-codes were used

All this applies at least from very late 60's to early 70's. AFAIK, all 7K-series serial numbers obey these rules.

I have a few 'scopes made in Heerenveen (The Netherlands, NL) with very low serial numbers (<200 and even <100 are pretty common) that are obviously much newer than that number would suggest.
AFAIK, regular Beaverton made 'scopes never carried such low serial numbers.
I have always assumed that production of a particular model in NL and Guernsey just started later than in the US and nicely rounded number series weren't used, explaining low non-Beaverton numbers applying to much higher Beaverton revisions. My two NL-made 7854's are examples. Also, creating a gap and continuing numbering from e.g. 250000 definitely hasn't been synchronized between Beaverton and non-Beaverton. One example of this are the many 465 portables made in Heerenveen, which are on both sides of the 250000 range and never carry a > 250000 serial number. The same holds true (MM) for 2465(X,A,B)'s made in Heerenveen.

Re: Guernsey Island 2445

Chuck Harris
 

Everything you want to know about serial numbers is in
the front of the 2445 manual, usually on the copyright
page.

I was using "8" as a sample prefix, Beaverton is "B",
Gurnsey is "1", UK is "2", Sony is "3", and Holland
is "7"

The primary thing I was trying to relate is the last
5 digits determines which engineering change orders
apply to your instrument.

-Chuck Harris

n4buq wrote:

Okay. Apparently I inferred too much from the example.

Thanks,
Barry - N4BUQ

----- Original Message -----

Re: Guernsey Island 2445

Chuck Harris
 

I am mix mashing Holland and Gurnsey.

But my point still stands. There was undoubtedly
a connection between all of the tek factories that
made a given instrument. I am certain that they
linked the serial numbers so that the engineering
changes apply to the last 5 digits of the serial
number, regardless of which factory made it.

-Chuck Harris

Colin Herbert via Groups.Io wrote:

I believe that all of the manuals were printed in Beaverton, but I might be talking rubbish. The Guernsey products had either no beginning letter or the letter "G", where Beaverton-made items are "Bxxxxxx".

I think that the part-numbers are the same, wherever the equipment is made. Otherwise, I think Deane Kidd would have had something to say about it!

Colin.

Re: Guernsey Island 2445

n4buq
 

Okay. Apparently I inferred too much from the example.

Thanks,
Barry - N4BUQ

----- Original Message -----
From: "cmjones01" <chris@...>
To: TekScopes@groups.io
Sent: Sunday, January 26, 2020 2:39:47 PM
Subject: Re: [TekScopes] Guernsey Island 2445

On Sun, Jan 26, 2020 at 8:51 PM n4buq <n4buq@...> wrote:

Did all the Guernsey serial numbers begin with 8? Mine has a six-digit
serial number that begins with 1.
Most of my Tek equipment was built in Guernsey, and it all has serial
numbers starting with 1. My 535A is right in front of me, serial
number 101936, and my 7904A (built in Guernsey even though I bought it
in the USA) is (I think) 100084.

Chris



Re: Guernsey Island 2445

cmjones01
 

On Sun, Jan 26, 2020 at 8:51 PM n4buq <n4buq@...> wrote:

Did all the Guernsey serial numbers begin with 8? Mine has a six-digit serial number that begins with 1.
Most of my Tek equipment was built in Guernsey, and it all has serial
numbers starting with 1. My 535A is right in front of me, serial
number 101936, and my 7904A (built in Guernsey even though I bought it
in the USA) is (I think) 100084.

Chris

Re: 11801 questions - funny fan noise and light

Leo Bodnar
 

Quiter fan would mean that 11801 can be used more and for longer.
And this is exactly what I don't want!
Leo

Re: Your generosity is STUNNING!

Michael A. Terrell
 

Why not set up a bank account for it, and Autopay for Groups.io? It could
also be used to fund group purchases for custom made replacement parts,
when you are short a person or two. Put the money back into the account
when the extras are sold. We did this for a computer club, in the '80s. It
was registered as a non profit, but it wouldn't be difficult to do that for
a group this size.

On Sun, Jan 26, 2020 at 12:46 AM Dennis Tillman W7PF <@Dennis_Tillman_W7pF>
wrote:

Hi Raymond,

You are one of the few people who did correctly identify your contribution
in my list.
This is the information I have on your contribution:
### DENNIS' LOCAL TIME $$$ STATUS CONTRIBUTOR
PAYPAL TRANSACTION
128 Wed 1/1/2020 2:50 PM $22.57 TO BE RETURNED Raymond Domp
Frank 9SK435895B100851N

Yes, Siggi is correct PayPal did this for everyone. They also obscure the
time you made your contribution because they strip out your UTC offset
(time zone) so I can’t tell the hour of the day you sent it. The minutes
are close however.

Thank you for your contribution. We received too much money to keep it all
so we will be refunding anything above $10.00 as soon as I have had a
chance to contact everyone who asked for confirmation that I received their
contribution.

Dennis

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
Raymond Domp Frank
Sent: Monday, January 20, 2020 9:45 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Your generosity is STUNNING!

Dennis,
My transaction could well be
9SK43*******0851N $22.57 TO BE REFUNDED
That's the only transaction in your list for the amount that I transferred.
Siggi may be right in assuming that Paypal references change between
sender and receiver (nice!) for international transactions.

Raymond




Re: Tek CRTs supplied to competing manufacturers

Bob Koller
 

I believe that the AN/UPM-137 IFF Test Set, at least the units made by Teledyne Electronics back in the day, had a Tek made CRT.

Re: Tek CRTs supplied to competing manufacturers

george gonzalez <grg2gonzalez@...>
 

I think it was the other way around, Tek used to buy CRTs from Dumont and
RCA but found out they were getting the below average CRTs. This came to
light when some university bought like 50 CRTs and some alert Tek person
noticed the tubes were not in serial number order and they all were
extremely bright and sharp, better than the ones sent to Tektronix. This
spurred Tek to start up their own CRT factory. Expensive but had superb
results.

On Friday, January 24, 2020, Greg Muir via Groups.Io <big_sky_explorer=
yahoo.com@groups.io> wrote:

Thanks, Dennis.

I did think it came from a fairly reputable source. But the years that
passed after reading of it made it rather fuzzy in the ol' brain.

As for another title, i would add "...and why was it subject to such
suffering under control of a holding company?"

("Big fish eating smaller fish")

Greg



Re: Guernsey Island 2445

n4buq
 

Did all the Guernsey serial numbers begin with 8? Mine has a six-digit serial number that begins with 1.

Thanks,
Barry - N4BUQ

----- Original Message -----
From: "Chuck Harris" <cfharris@...>
To: TekScopes@groups.io
Sent: Sunday, January 26, 2020 1:34:58 PM
Subject: Re: [TekScopes] Guernsey Island 2445

I am pretty sure that the last 5 digits between Guernsey
and Beaverton units are not unique, but rather, are sync'd
to each other so the change orders apply.

In other words, you can have a B012345 and an 8012345 scope,
and each will use the revisions specific to B012345.

They were in communication with each other.

-Chuck Harris

n4buq wrote:
My 2445 was made in Guernsey Island. In the manual I have, I notice there
are references to certain serial numbers for certain parts, etc., and that
that made me wonder if/how those would apply to the Guernsey model
numbers. I presume there was not a separate manual for those models,
correct, and, if not, I wonder which serial numbers might apply?

Thanks,
Barry - N4BUQ






Re: 2400 series Test 4 Fail 3,13, 1

Craig Cramb
 

It would probably be fine.

Thanks Chuck, it looks like there are some used and new ones from private sellers.

Craig

On Jan 26, 2020, at 1:20 PM, Chuck Harris <cfharris@...> wrote:

It would probably be fine.

Re: Guernsey Island 2445

Chuck Harris
 

I am pretty sure that the last 5 digits between Guernsey
and Beaverton units are not unique, but rather, are sync'd
to each other so the change orders apply.

In other words, you can have a B012345 and an 8012345 scope,
and each will use the revisions specific to B012345.

They were in communication with each other.

-Chuck Harris

n4buq wrote:

My 2445 was made in Guernsey Island. In the manual I have, I notice there are references to certain serial numbers for certain parts, etc., and that that made me wonder if/how those would apply to the Guernsey model numbers. I presume there was not a separate manual for those models, correct, and, if not, I wonder which serial numbers might apply?

Thanks,
Barry - N4BUQ




Re: Guernsey Island 2445

Colin Herbert
 

I believe that all of the manuals were printed in Beaverton, but I might be talking rubbish. The Guernsey products had either no beginning letter or the letter "G", where Beaverton-made items are "Bxxxxxx".

I think that the part-numbers are the same, wherever the equipment is made. Otherwise, I think Deane Kidd would have had something to say about it!

Colin.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of n4buq
Sent: 26 January 2020 19:07
To: TekScopes@groups.io
Subject: [TekScopes] Guernsey Island 2445

My 2445 was made in Guernsey Island. In the manual I have, I notice there are references to certain serial numbers for certain parts, etc., and that that made me wonder if/how those would apply to the Guernsey model numbers. I presume there was not a separate manual for those models, correct, and, if not, I wonder which serial numbers might apply?

Thanks,
Barry - N4BUQ