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Question for the experts

Lynn Lewis
 

I would like to get to the point where I can calibrate my own
oscilloscopes. To keep this question within reasonable limits, let's say (1)
analog only and (2) 500MHz or less. Rather than buy all this specialized
equipment, some of which seems to go with one scope and not with another,
can I buy generic equipment with minimum specifications that I can use to
calibrate any scope within those limitations? If yes, what do you recommend?
Re: Silly prices on eBay

Lynn Lewis
 

That's not a bad price. Is there any chance the 500 series extender can be
made to fit a 7000?

I had thought about taking a female from a backplane and a male from the
back of a junk card and making my own extender. The problem is that the
cards don't have print running to all the pins. I remember seeing something,
in MCM I think, where you could "paint" new print on a PCB. Has anyone here
ever tried that?

-----Original Message-----
From: Richard W. Solomon [mailto:w1ksz@...]
Sent: Friday, January 25, 2002 5:20 PM
To: TekScopes@...
Subject: RE: [TekScopes] Silly prices on eBay


Not that nuts - they are quite rare and very useful if you do a lot of
repair work.
Even the 500 series extenders go for $20-50.
Re: On screen display and other CRT items....

 

Craig,
The option is 122C and Tek calls it 'High Voltage Diode Check'. I do not
have that option on my 575 but I infer from manual that current capability
is less than 1 mA: manual recommends to set display current to 0.01mA/div
when using this option. If you really want to convert your 575, I have a
write up, but work appears quite messy. The major additions are a
transformer and sections to rotary switches and there are also some changes
to wiring.
Regards
Miroslav Pokorni

----- Original Message -----
From: "Craig Sawyers" <c.sawyers@...>
To: <TekScopes@...>
Sent: Thursday, January 24, 2002 11:00 AM
Subject: RE: [TekScopes] On screen display and other CRT items....


I'm coming in late, so pardon if I'm responding
to a non-issue. Someone doesn't recognize the 571.
That was Tek's first transistor curve tracer.
Looks similar to its predecessor the 570 tube
curve tracer.
I think you're thinking of the 575, David. I have one just behind me as I
type. They do Tunnel Diodes too (with care), and mine will in due course
do
tubes as well (via an add-on box fed from the 175 connector on the back
and
the tranny sockets on the front). The only limitation for tubes is the
200V
maximum collector (anode) sweep. Those lucky ones who have an option (I
think 21?) have a 400V sweep, and that would clearly be even more useful.

Craig
Re: On screen display and other CRT items....

 

I have never heard of 571. But, Dave, I take exception to your leap to 576.
As a proud owner of a 575 I can not let it go by that you skip mentioning
the old transistor tracer stalwart.

Regards
Miroslav Pokorni

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

From: "David Wise" <david_wise@...>
To: <TekScopes@...>
Sent: Thursday, January 24, 2002 10:34 AM
Subject: RE: [TekScopes] On screen display and other CRT items....


From: donlcramer@... [mailto:donlcramer@...]

My apologies Miroslav. Our curve tracer is I think a 576,
not a 571. A bad
I'm coming in late, so pardon if I'm responding
to a non-issue. Someone doesn't recognize the 571.
That was Tek's first transistor curve tracer.
Looks similar to its predecessor the 570 tube
curve tracer.

I used one in school, great instrument but
superseded by the 576 (smaller, looks more 7000-ish,
claims to do FETs as well as bipolars*) and I don't
know what-all since then.

* You can sort of do FETs on the 571 too, but it won't tell
you how.

Regards,
Dave Wise
Re: HP counter - off topic

 

Hello Craig,

You might want to consider using a wire-OR of 2-input open collector NANDs,
e.g. 74LS38. It is still a kludge but it is only one IC with few wires and a
flying resistor. If you place a socket on the circuit board and use one of
those 'discrete component adapters' you can do whole thing without cutting
original board.

While on the subject of strange ICs, does anyone know what are Tek's
155-0015-01 and 155-0038-01; the latter is used in 7M13, a Readout Unit, a
plug in that puts text on the screen of 7000 scope.

Regards
Miroslav Pokorni

----- Original Message -----
From: "Craig Sawyers" <c.sawyers@...>
To: <TekScopes@...>
Sent: Thursday, January 24, 2002 12:39 AM
Subject: [TekScopes] HP counter - off topic


Hi List

I *know* this is a Tek list - so this is off topic. However, I was so
pleased to have sorted out a problem on my HP 5328A timer I just had to
crow
a little.

Ever since I got it, some of the funtions didn't work well (like time
interval and ratio). However, when frequency and period measurement died
too it was clearly time to do something about it. Now this counter cost
me
???22 (around $30) on eBay, so it owed me nothing - but I'm a determined
cuss
and rarely admit defeat.

Followed around 3 days of diagnostics - derailed by errors in the manual
(the military version). Eventually it turned out to be a chip on the
Function Selector card - labelled Time Base Multiplexer. Now this was a
7454, now obsolete. So having dug out the chip, isolated the output pin
and
confirmed that it was indeed *that* chip (and not the one it was driving
holding its output low) I was then confronted with what to do.

Now the chip is a bunch of ANDs and a NOR that does /(AB + CD + EF + GH).
So it would have been possible to replace it with a 7400 and a 4-input
NOR -
except that there is no 4-input NOR in fast TTL, just in slow CMOS (and
this
chip has to handle a PLL synthesised 100MHz clock). So I transformed the
logic funtion to /(AB)./(CD)./(EF)./GH and used a 74F00 (quad 2-input
NAND)
and 74ALS21 (dual 4-input AND), strung together in place of the original
7454.

Works an absolute treat!

Cheers

Craig
Re: Silly prices on eBay

Richard W. Solomon
 

Not that nuts - they are quite rare and very useful if you do a lot of
repair work.
Even the 500 series extenders go for $20-50.

Regards,
Dick S.

-----Original Message-----
From: Craig Sawyers [mailto:c.sawyers@...]
Sent: Friday, January 25, 2002 8:51 AM
To: TekScopes@...
Subject: [TekScopes] Silly prices on eBay


This one really is nuts - 1692324316 - a Tek 7000 series card extender
closed at $162.50 after 9 bids.

Craig


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Re: Silly prices on eBay

Lynn Lewis
 

Tektronix 067-0616-00 Calibration Fixture
Item # 1689683477

The flexible version sold for $270.96

I'd like to have either one but that's more than I want to pay.

-----Original Message-----
From: Craig Sawyers [mailto:c.sawyers@...]
Sent: Friday, January 25, 2002 7:51 AM
To: TekScopes@...
Subject: [TekScopes] Silly prices on eBay


This one really is nuts - 1692324316 - a Tek 7000 series card extender
closed at $162.50 after 9 bids.
Re: Silly prices on eBay

John Miles
 

Those are worth their weight in gold if you need one, though. I paid more
than that for a set of 492 extender boards and haven't regretted it yet.

-- jm

----- Original Message -----
From: "Craig Sawyers" <c.sawyers@...>
To: <TekScopes@...>
Sent: Friday, January 25, 2002 5:51 AM
Subject: [TekScopes] Silly prices on eBay


This one really is nuts - 1692324316 - a Tek 7000 series card extender
closed at $162.50 after 9 bids.

Craig
Re: Warning - Military Manuals

William de Bruyn
 

Hello Jim, I would be very interested in some of the manuals I haven't been
able to aquire, I will look forward to seeing what you have, perhaps we can
exchange some information also.

William de Bruyn

You are right. Many of the military manuals are only
parts lists and calibration info. The Army website
listed on this forum previously showed 68 Tektronix
manuals. Only about a dozen of these are complete
Operator/Service type manuals (I know, I downloaded
all of them plus the HP, Fluke, Wavetek, etc.). I
have spent many hours sorting through my downloads to
label the files as regular manuals or parts manuals.

I have also found many more manuals on the Marines and
Navy websites. There is a statement on the Marine
site that now says all of these manuals are free for
public use and unlimited distribution.

If anyone in this group needs one of these manuals on
CD, let me know. I will try to make a list of what I
have and put it on an FTP site.

I am not going to try to sell CDs like others, but
will give you the CD for my cost to make,package, and
ship (I already traded Stan Griffiths a set).

I also have hundreds of original manuals also I will
usually sell for a lot less than most manual places.

Jim Reese

--- jcastanton <jstanton@...> wrote:
Recently CD collections of military test equipment
manuals have
become available. With excitement I bought a
collection of "31
Tektronix Manuals".

To my disappointment the "manuals" were in fact
simple notes; some
just parts lists, others simplified calibrations
instructions. There
are no schematics or service information. Beware.

On the question of life of TV and monitor tubes I
seem to recollect
that life was extended by limiting brightness.
Monitor quality
certainly makes a difference, we have 15 year old
IBM monitors that
cost around $3,000 when new but still work perfectly
yet only expect
modern PC monitors to function for a couple of years
before they fail
and are discarded as beyond economical repair.


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Re: Warning - Military Manuals

Lynn Lewis
 

Tektronix Copyright is not a problem. I checked with both the Army and with
Tektronix before I distributed any PDF files.
Here are my questions and the answers provided by the Army:

* * * * * * * * * *

"1 If they are approved for public release, is it okay to access this site?"
Response: Yes.

"2. If it is not okay to access this site, then where can I get the files
since they have been approved for public release?"

Response: It is okay to access this site. Those publications that are do not
have distribution code A (public release) require a logonid and password to
access.

"3. Since these documents were authored by the U.S. Army or its agents and
they have been approved for public release with unlimited distribution, is
there any copyright infringement when the documents are copied and sent to
others?

Response: Please let us know if you find a publications that indicates
copyright.

"4. It appears that the creation of the online manuals was interrupted since
many manuals do not appear there. Is there another source from which the
missing manuals can be obtained? (Or does the fact that they are not there
indicate that they were never placed in PDF files?)"

Response: They may be Interactive Electronic Technical Manuals(IETM). At
this time, they IETMs are not at the ETMs Online website.

Other source: National Technical Information Service (NTSI) sells
nonclassified/nonrestricted publications to nonDOD persons. 1-800-553-6847
(Sales Office - can check to see if they have pub and what it will cost
requestor.)

Your interest in electronic technical manuals is greatly appreciated. If
future inquiries to LOGSA are necessary on this e-mail, please refer to
Control Number 2964, via e-mail address: logetm@...

Judith Stephens

ETM Configuration Spec

DSN 645-9844

Commercial 256 955-9844

* * * * * * * * * *

Of course we know that some manuals do indicate a Tektronix copyright but
then here are my questions to Tektronix and their responses:

* * * * * * * * * *

Dear Mr. Lewis:


This responds to your recent email message regarding the copying of
Tektronix manuals (or corresponding PDF files) for now-discontinued products
originally provided to the military.


You asked:

1. Have these been placed in the public domain? If yes, is there a notice
available to that effect?

These manuals (including any corresponding PDF files made by the military)
have not been placed in the public domain. However, they may be freely
copied and reproduced per the terms set forth below.

2. Is it okay to distribute these freely? If yes, what constraints,
disclaimers, or messages would you require to be placed in an ebay auction
for the purpose of distributing this PDF file either by way of an email
attachment or by way of a CD containing the PDF file.

Yes, subject to the following terms and conditions set forth below,
Tektronix, Inc. hereby grants you a non-exclusive, royalty-free license and
permission to reproduce and distribute, in any form via any medium, copies
or partial copies of the Tektronix materials identified in your December 31
email message.

This permission and license does not apply to any manual or other
publication that is available directly from Tektronix, nor to any manual or
other publication for video production products (Grass Valley Group and
Profile brand products)or color printer products.

All copies must include the copyright notice(s) carried by the copied
work(s)- e.g., Copyright 19XX Tektronix, Inc. All rights reserved."

Tektronix does not warrant the accuracy or completeness of the information,
text, graphics, schematics, parts lists, or other material contained within
any manual or other publication that is produced or distributed in
accordance with the permission and license set forth above. TEKTRONIX SHALL
NOT BE LIABLE FOR ANY DAMAGES WHATSOEVER (INCLUDING, WITHOUT LIMITATION, ANY
CONSEQUENTIAL OR INCIDENTAL DAMAGES, DAMAGES FOR LOSS OF PROFITS, BUSINESS
INTERRUPTION, OR FOR INFRINGEMENT OF INTELLECTUAL PROPERTY) ARISING OUT OF
THE USE OF ANY MANUAL OR OTHER PUBLICATION PRODUCED OR DISTRIBUTED IN
ACCORDANCE WITH THE PERMISSION AND LICENSE SET FORTH ABOVE."

3. If it is not okay to download and/or distribute them, how can I get them
legally?

n/a

If you have any further questions about the reproduction of Tektronix
manuals, please direct them to me at the email address shown below.

John D. Winkelman

Tektronix, Inc.

Law Department

email: john.d.winkelman@...



* * * * * * * * * *

Based on these two responses, I see no problem with setting up an online
library as long as we follow the guidelines given by Mr. Winkelman. Since we
have no control over the libraries that currently exist, I suggest that we
(wide-band users) make sure all the material available is archived on
several home-computers before somebody decides to take the sites down. I
think I have all the Tek manuals but I'll check over the weekend to be sure.

Question: If we do this on-line library, will it be limited to Tektronix?
Re: Warning - Military Manuals

 

Thanks! Now to find enough time to wade
through all that. It's a dirty job, but
somebody gets to do it :-)

From: Jim Reese [mailto:nfeinc@...]

Here are some more links to equipment manuals,
training manuals, and a lot more.
Regards,
Dave Wise
2246 parts needed

Charles Johnson
 

Hi All,
I have a 2246 with a bad input buffer amp module on CH.1 The service manual says the Tek part number is 165-2154-00. But the modules themselves have 165-2232-00 printed on them. The modules are clearly original, and factory installed. Anyway this is the part I need. Tek says they are stock out and no longer producing. It looks like I will have to obtain one from someone who has a junk 2246. Is there anybody that can help me here?
Thanks in advance.
Chuck Johnson
Silly prices on eBay

Craig Sawyers
 

This one really is nuts - 1692324316 - a Tek 7000 series card extender
closed at $162.50 after 9 bids.

Craig
Re: On screen display and other CRT items....

Craig Sawyers
 

Hi Stan

The 575 option you are thinking of is called "Mod 122C".
I *thought* it had a 2 and a 1 in it somewhere!

I have one.
That comes as no surprise whatever ;-)

On another topic, I was picking up a piece of AVO test gear this morning for
a guy I know quite well, and we were talking about 570's. Apparently a
friend of his picked one up at a hamfest in October for (wait for it...)
?10!!!!! The guy selling it clearly didn't know what it was, or its rarity.

Although I too got a mini bargain today on eBay - the capacitance
standardizers for the 500 series scope plug ins - for $5 each.

Cheers

Craig
Re: On screen display and other CRT items....

Stan or Patricia Griffiths
 

Hi Craig,

The 575 option you are thinking of is called "Mod 122C". I have one.

Stan
w7ni@...

Craig Sawyers wrote:

I'm coming in late, so pardon if I'm responding
to a non-issue. Someone doesn't recognize the 571.
That was Tek's first transistor curve tracer.
Looks similar to its predecessor the 570 tube
curve tracer.
I think you're thinking of the 575, David. I have one just behind me as I
type. They do Tunnel Diodes too (with care), and mine will in due course do
tubes as well (via an add-on box fed from the 175 connector on the back and
the tranny sockets on the front). The only limitation for tubes is the 200V
maximum collector (anode) sweep. Those lucky ones who have an option (I
think 21?) have a 400V sweep, and that would clearly be even more useful.

Craig
Re: On screen display and other CRT items....

Stan or Patricia Griffiths
 

Hi David,

I think you are thinking of the 575, not 571. I don't think Tek ever
assigned 571 to any instrument.

Stan
w7ni@...

David Wise wrote:

From: donlcramer@... [mailto:donlcramer@...]

My apologies Miroslav. Our curve tracer is I think a 576,
not a 571. A bad
I'm coming in late, so pardon if I'm responding
to a non-issue. Someone doesn't recognize the 571.
That was Tek's first transistor curve tracer.
Looks similar to its predecessor the 570 tube
curve tracer.

I used one in school, great instrument but
superseded by the 576 (smaller, looks more 7000-ish,
claims to do FETs as well as bipolars*) and I don't
know what-all since then.

* You can sort of do FETs on the 571 too, but it won't tell
you how.

Regards,
Dave Wise


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Re: Anybody need these Tek tubes?

Stan or Patricia Griffiths
 

The 8136's are used in place of 6DK6's in 540/550 vertical amplifiers. The
8136 is a 6DK6 that will never develop cathode interface . . .

Stan
w7ni@...

"Phil (VA3UX)" wrote:

Hi Walter.

I could probably use the 5642's and 12AU6's for my pile of 500 series
scopes. The 8136's - not sure what they're for but I'll check my manuals
to see if they're used in anything I have. Those old 555's and 556's have
so damn many tubes in them that I can't remember the tube line-ups anymore.

Thanks

Phil Turcotte
Grimsby, Ontario
Re: [Test-Equipment] Best way to ship a Tek 7904 mainframe?

L. Mark Pilant
 

Hi Jose.

Well, the only overseas shipping experience I had is the reason
I started doing my own packing. The only reason the package
survived was because it was an R-390A and CV-591 (going to Finland).
I had specified double boxed and foam in place. When it arrived in
Finland, I discovered it was single boxed using the foam "peanuts".
Fortunately everything arrived unharmed.

Anyway, from all the packing and shipping I have done since then
I have discovered that once a package gets to a certain size, it
gets bumped into the next weight class. This can happen more
than once. So a small heavy object can cost as much to ship as
a large light object.

Given this, and that FedEx uses air shipping to Europe, the
$295 sounds a bit high, but not really surprising to me. You
might check out UPS, DHL, and some of the other international
shippers. Although if it goes by air, I don't expect the cost
to be all that much different. :-(

Good luck.

73

- Mark N1VQW
Re: Warning - Military Manuals

Don Black
 

I'm still hoping someone can send me a scan of the 7A12 plugin schematic.
I think an online manual library is a terrific idea, I have some manuals I can
scan if needed.
Don Black.

William de Bruyn wrote:

Hello Jim, I would be very interested in some of the manuals I haven't been
able to aquire, I will look forward to seeing what you have, perhaps we can
exchange some information also.

William de Bruyn

You are right. Many of the military manuals are only
parts lists and calibration info. The Army website
listed on this forum previously showed 68 Tektronix
manuals. Only about a dozen of these are complete
Operator/Service type manuals (I know, I downloaded
all of them plus the HP, Fluke, Wavetek, etc.). I
have spent many hours sorting through my downloads to
label the files as regular manuals or parts manuals.

I have also found many more manuals on the Marines and
Navy websites. There is a statement on the Marine
site that now says all of these manuals are free for
public use and unlimited distribution.

If anyone in this group needs one of these manuals on
CD, let me know. I will try to make a list of what I
have and put it on an FTP site.

I am not going to try to sell CDs like others, but
will give you the CD for my cost to make,package, and
ship (I already traded Stan Griffiths a set).

I also have hundreds of original manuals also I will
usually sell for a lot less than most manual places.

Jim Reese

--- jcastanton <jstanton@...> wrote:
Recently CD collections of military test equipment
manuals have
become available. With excitement I bought a
collection of "31
Tektronix Manuals".

To my disappointment the "manuals" were in fact
simple notes; some
just parts lists, others simplified calibrations
instructions. There
are no schematics or service information. Beware.

On the question of life of TV and monitor tubes I
seem to recollect
that life was extended by limiting brightness.
Monitor quality
certainly makes a difference, we have 15 year old
IBM monitors that
cost around $3,000 when new but still work perfectly
yet only expect
modern PC monitors to function for a couple of years
before they fail
and are discarded as beyond economical repair.


__________________________________________________
Do You Yahoo!?
Great stuff seeking new owners in Yahoo! Auctions!



To unsubscribe from this group, send an email to:
TekScopes-unsubscribe@...



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Re: restoring 475a/dm44

Craig Sawyers
 

Wow ! Was that an Enigma one ? How did it manage to survive ?
I know this is way OT but I can't resist !

Gaston
No - this was a Lorenz machine, type SZ42. SZ is Schlussel-Zusatz, or
cipher attachment and 42 is the model year. Works by taking serial 5-bit
Baudot plain text and then encoding it in parallel by XORing it with two
sets of 5 pseudo-random key streams. Pseudo-random repeat length is 10^19,
or around 10^6 longer than the Enigma. It then serialises the enciphered
data back into Baudot and sends it down a telegraph line to a radio
transmitter. It does the whole shooting match electromechanically - not a
single active device in it! Hats off to Lorenz, this thing is like a Swiss
watch.

There was only 150 units ever made, and because of the cipher security they
were only used for communication between the German High Command and Hitler.
Most of course were destroyed by the Germans, as they were supposed to have
been. However, the Bletchley Park one was used by Field Marshal Kesselring,
who was in charge of Italy initially and was then reassigned to the Western
Front just in time for the Allied Normandy assault. It was captured in
Berlin as Kesselring retreated in disarray.

The huge importance of this machine is that it gave rise directly to the
computer age. Faced with an impossible task of manually breaking the code,
Colossus was invented - a 2500 tube (even more than a 545!!) machine that
could find the Lorenz settings in around 20 minutes if it was possible to do
so. It was a massively parallel special-purpose processor (it looked for
statistically significant correlations in the cipher) that was only beaten
on time by a Pentium PII a few years ago. I guess it was the early
equivalent of a DSP or Codec chip now. By the end of the war there was 10
Colossi at BP, all of which were destroyed on Churchill's orders after the
war. It has, however been rebuilt - if you do a websearch on "Colossus
computer" you'll find a bunch of data on this.

Craig
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