1. TekScopes@groups.io
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Re: Tektronix scope paint; source??

Stan & Patricia Griffiths <w7ni@...>
 

I actually have cans of Tek Blue spray paint made up locally by the same
company that made if for Tek. Unfortunately, it is considered hazardous
material by virtually all carriers (US Mail, FedEx, UPS) and extremely
expensive to have packaged for shipment . . . something like $75 per can.
This pretty well makes it impossible for me to supply it to you. I would be
happy to sell either Tek Blue or the earlier Tek Brown (Gray) to you guys by
the can if you are willing to pay $15 per can plus shipping, which means
something like $90 per can, your cost. Unless, of course, you can find a
legal way for me to ship it for less, then it would be $15 per can plus
whatever less expensive shipping method you can find for me to ship it. If
you know how it can be done, please drop me a note explaining in
step-by-step detail how it can be done and who the carrier will be. They
have to know what they are carrying (lacquer in a pressurized spray can)
since I will not risk keeping the truth from them. The penalties for
getting caught are just too great . . .

Stan
w7ni@easystreet.com

----- Original Message -----
From: "drd_007" <DrD@2020.com>
To: <TekScopes@yahoogroups.com>
Sent: Thursday, June 13, 2002 10:45 AM
Subject: [TekScopes] Tektronix scope paint; source??


Hello all,

What is the best source for O-scope blue paint? Anyone had
experience on matching it via paint store computers or buying it from
some other source?

Email me if possible,

Regards,

Mike, K4MMR
DrD@2020.com



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Re: Fuzzy 465B trace revisited *correction*

Robert Fincher <robfincher2001@...>
 

Hi Don,
I have a 465 which displays exactly (!) the same
characteristics as yours. Like you, I've checked
everything I can think of, and all signals at the CRT
are clean. However, another common feature of our
respective scopes is that they were both rescued from
the dumpmaster. Mine had quite a dent on its case and
one of the sync triggering pots' shaft was sheared
off. It looked like someone had thrown it into the
dumpmaster and I believe the impact may have upset the
internals of the CRT sufficiently to cause the
described effects.
Pity, because in all respects the 465 is a nice
machine. However I have learnt to live with the
problem, and now I only use it when I need real
portability.
Regards
Rob Fincher
VK3BRF

<tt>
Sorry it's late.&nbsp; The trace thickness is ~0.15
vertical divisions.&nbsp; That is, <BR>
almost a "minor" tall.&nbsp; If it were 0.15
minors thick I'd be celebrating!&nbsp; <BR>
--Don<BR>
<BR>
<BR>
[Non-text portions of this message have been
removed]<BR>
<BR>
</tt>

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556 problem

Morris Odell <morriso@...>
 

Hi all,

I need some advice about a problem with my 556. It works perfectly for 45
minutes or so after switch on and then suddenly develops a HV problem in the
lower beam. This does not come on gradually like the 545B/547/549 lossy
transformer bug, but happens suddenly. The lower beam dims and is only
visible on the highest intensity setting. The upper beam keeps its intensity
range but is a bit dimmer and blooms. Switching timebases makes no
difference. Once the scope cools down, all is well until it warms up again.

The 556 has 2 HV supplies for the 2 beams. The lower beam supply has the
tripler for the PDA voltage. I suspect the fault is in the lower beam HV
section, possibly in the focus supply which also feeds the tripler.

Any ideas? I think a vacuum tube problem is unlikely. It doesn't behave like
the 547 lossy transformer problem. Perhaps a temperature sensitive resistor
or cap? The HV time delay circuit? I have a few things on my bench at the
moment but I will eventually get the 556 on there for some intensive
troubleshooting.

Morris
Tek manuals

djmartins2000
 

Hi all,

I have been reading a lot about people wanting to
scan and post manuals.
The prices for the manuals are outrageous, and many
people are selling photocopies in addition to
scans and originals. Now I have a couple of 7704As and
a manual to fix them, , a TM506 and manual,
a 7613 w/o manual and a 7834 I REALLY need a manuals for.
I paid more for the manuals than the scopes.
So, I will scan either manual *if* someone will scan
a 7613, 7834, or 7934/7904 service manual.
Scanning takes a lot of time, let's get the ball rolling,
or I may have to buy the manuals at high prices,
and start sell photcopies too, to offset the costs! ;)

thanks,
Doug
453A pin 12 on CRT

zs5la
 

Hi there folk
First of all, many thanks to those that have helped me with the HV
supply problem. I have now got the whole thing oscillating but the
amplitude of oscillations are only 1V on pin 1 of the ferrite
transformer instead of about 20V what the manual for the 453 or the
454 say. All the caps check out OK. We are getting somewhere though.
I now have a loose wire that comes from pin 12 of the CRT and I don't
know where this connects. In my 454 and 453 manual, there is no
connection to pin 12 on the CRT at all. The HV PSU of the 453A is
very slightly different from the 454. I have the same colour wire
coming out of the HV section (red-brown on white) which I have taken
to ground because this seems to come from the bottom of the "focus"
series of resistors. Perhaps both of these should be joined. Any
help, perhaps a scanned image of the 453A HV section would be very
useful.

Thanks.

Rob Cohen
Fuzzy 465B trace revisited *correction*

donlcramer@...
 

Sorry it's late. The trace thickness is ~0.15 vertical divisions. That is,
almost a "minor" tall. If it were 0.15 minors thick I'd be celebrating!
--Don
Fuzzy 465B trace revisited

donlcramer@...
 

Hope there are some techs with 465B experience out there...

I have a 465B saved from the dumpster, now all fixed up, except it has one
annoying little problem left. The trace is fat, about 0.15 minors wide
regardless of whether the 20MHz BW limit is engaged or not. This fuzzy trace
isn't the usual scan expansion mesh thing I don't think. It is odd in that a
sharper trace is visible within the fuzzier band, and the fuzzy bit isn't
necessarily symmetrical about this sharper trace. When I put the scope in XY
mode to create a spot to check the focus/astig, the spot behavior is quite
odd.

Normally, you expect the focus control to fuzz the spot either side of a
sharp point near the center of rotation, with the astig smashing this either
vertically or horizontally. In my case, focus can make a keystone pattern,
or a cross which looks like it could hang on a Christmas tree. The bright
spot varies within this glob, it's not necessarily centered. The astig
doesn't quite do the squish vertical or squish horizontal thing, though it
tries. In no combination of the focus/astig can I get a nice sharp dot, only
a more or less round dot that's fuzzy.

The regulated supply voltages are dead on, with almost no ripple. The
geometry and Y axis are set correctly. The +55V and +33V which go to the CRT
grids are right on, the astig voltage swing is ok, and the mesh voltage is
good (at least at the wire going up to the CRT). I don't have a HV probe yet
to verify the CRT cathode (-2450V), the focus grid (-1700V) or the anode
potential itself. The tube has plenty of brights and the geometry is ok
(that is, the shape of a displayed waveform itself is the same regardless of
where on the screen you position it). The signal at the vertical plates is
clean (when displaying a sine wave for instance).

One other thing: everything I fixed on this scope was from someone working on
it previously. Either that guy fixed the original problem and hosed up the
rest of the scope, or that *original* problem was never fixed.... Hmmm.

So I thought I'd ask ("finally he gets to the point"): if you can't get
normal behavior on the focus and astig controls, is it the (gulp) CRT? Or is
there a circuit problem that will cause these symptoms (like focus tracking
messed up or some such)?

Thanks in advance,

Don
465A?

donlcramer@...
 

Anyone know why there is no 465A? That is, the line went from 465 to 465B.
475 went to 'A'...

Don
Type 321

torquemada40223
 

Hello, all--

I've got a Type 321 that I'd like to repair or sell. It's just too
pretty inside to dismantle, so I'd like to repair it for use or sell
it to someone who would like to have an antique...

In order to repair it, I need a schematic. I suspect that the CRT
is bad, but I'm not sure yet. I don't get a trace, and I see no
filament glow. But the thing has a power supply problem, so it's
possible that there's no glow because the filament supply doesn't
work.

So...Anyone have a schematic for this thing?

--marco
Re: [Test-Equipment] Tektronix manual archive ( Part 2)

Stan & Patricia Griffiths <w7ni@...>
 

I suggest you take another look at this entire concept and consider
obtaining permission from the copyright holder (Tektronix) before you do ANY
copying of Tek manuals.

I may be wrong, but I doubt you have obtained such permission from Tek. If
you have, I apologize for suggesting differently . . . You could have
permision (as I have) and I would not know about it . . .

Stan
w7ni@easystreet.com

----- Original Message -----
From: "vaxxine" <phil@vaxxine.com>
To: "Mike Manes" <manes@attglobal.net>
Cc: <TekScopes@yahoogroups.com>
Sent: Sunday, June 09, 2002 5:28 AM
Subject: [TekScopes] Re: [Test-Equipment] Tektronix manual archive ( Part 2)


At 10:28 PM 6/8/2002 -0600, you wrote:
Hello Robert,

The proposal to produce a Tek manual archive site came out on the
And I agree that the original scan should be .gif or .tiff. But
Adobe Acrobat sure does a great job of compressing doc files down to
a size that won't tie up one's phone line for an eternity!
Mike and others,

Take a close look at the DejaVu software and file format for this sort of
document. It's a competitor to Adobe Acrobat and it looks really
good; apparently much smaller file sizes than Adobe for the same
document. Find out about it at the BAMA website. It appears that BAMA is
going to convert all of their material over to the DejaVu format. There
is
a link there for the DejaVu software at the BAMA website and some
discussion about comparing file sizes, etc.

The home page is : http://bama.sbc.edu/

Discussion of the DejaVu software is at : http://bama.sbc.edu/viewers.htm

Phil

BTW, I've just returned from my first visit to your beautiful province.
Although we didn't make it up to Edmonton, Cagary was very reminiscent
of Denver, where I live, and the Lake Louise meeting site was simply
magnificent!

73 de Mike Manes W5VSI
Littleton CO USA

Robert Rolf wrote:

I would also be happy to contribute to such a site.
Mostly have 51xx & 76xx series scope manuals, but also have have a lot
of
1xx & 2xx module info.

I would suggest that the scans be done as 2 color GIF's at minimum
300DPI
(NOT JPGs which are LOUSY for binary images) in order to get readable
images.

We could set up such a site on Yahoogroups (which allows 30MB for
images,
20MB for files), but there is no guarantee that the data would always
be
there. The downside is that you have to view the adverts on the page,
but
where else can we get the kind of free bandwidth that manual scans
will
consume?

There already exists a tekscopes group
http://groups.yahoo.com/group/TekScopes/
which already has a number of "pictures and data" in the files
section.
(Tek 5000, 500, 600, 7000) as well as module photos in the photos
section.

The big issue is whether Tek will let us infringe their copyrights
in posting their manuals to a publicly accessible site.
They won't sell us the manuals, since they don't publish them anymore,
but
technically, it IS a copywrong. Is anyone well connected with Tek and
able to get us a formal permission letter? I can easily set up a
separate yahoogroup since I already run several and am very
familiar with Yahoos management tools.

Comments?

Robert

Mike Manes wrote:

Hi Ray,

Let me know when you set up your archive. I need a service manual
for a 1L10 S.A. plugin.

73 de Mike W5VSI

Johnsorj@aol.com wrote:

HI All

Thanks to everyone who replied with offers for partial
or complete manual copies on the Tek 7603---I appreciate
the offers....

I am still keen to start or contribute to an on-line archive
of Tek schematics/repair info. The Vacuum Tube radio folks have
their BAMA site which is excellent for older radio gear.They
don't have much Tek info but I will contact the owner of BAMA
to see if we could upload to their site... One issue might be
large size of the complete mauals so we might have to limit
the info to just basic schematics... I will find out and report
back to the group.... ANy inputs on this are greatly
appreciated..

Ray Johnson KE3QY/0
St.Paul ,MN

+++++++++++++++++++++++++++++++++++++====

In a message dated 02-06-05 10:30:25 EDT, you write:

<< Subj: [Test-Equipment] Tektronix manual archive ????
Date: 02-06-05 10:30:25 EDT
From: Johnsorj@aol.com
Sender:
To: test-equipment@mailman.qth.net


Hi All

A few months back, I recall that someone had mentioned that
Tektronix had given permission to openly post manuals/schematics
for
older Tek equipment without copyright issues.......

I have been searching for a schematic diagram for a 7603
mainframe
power supply without success. I have found a small number of
schematics for the older tube instruments but virtually nothing
for the 7000 series scopes.

Is there a location on-line for Tek schematics?? I would be very
happy to contribute a large number of 7000 series plug-in
manual postings( approx 15 ) in exchange for 7603 and 7623
diagrams......

I think that this could be very valuable for everyone since the
Tek
7000 series prices have fallen to very attractive levels and
these
scopes are superb " home shop" units...........

Please let me know......

regards
Ray Johnson KE3QY/0
St.Paul,MN
--
Mike Manes manes@attglobal.net Tel: 303-979-4899
"Things should be made as simple as possible, but not more so." A.
Einstein


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7854 Service info

Max Vaughan
 

I am looking to either borrow, rent or buy a 7854 service manual. I am also
looking to add more
memory to it as well and am looking to find what options were available for
this scope.

The only thing that seems to be wrong with this scope is that the focus
control for the
intensity knob goes to very bright after the first couple of tick marks, not
sure if this
is normal or not. The focus seems to be tied in with this. I can get a nice
clean trace.
But have to constantly change and adjust intensity as I change sweep speeds.

A few years back I acquired some plug in circuit boards for various Tek
equipment.
Not sure what they are, but some of the parts on them might be of use to
someone.
Will compile of list of the part numbers and board numbers and post them.

I also have a bunch of assorted small screws used in Tek stuff. (2 lbs.) if
any one
is in need of some original miniature screws. Variouse lengths.

You can contact me off list at max@horizonps.com
File - Posting Rules

TekScopes@...
 

Please edit any posts/replies to the list to
minimize quoted material.

Please do not send personal replies to the list.
List replies go to the list by default. To reply only to a message's
sender, either cut and paste their name, reply to all and delete
"TekScopes", or use a reply-to-sender function if your email client
has it.

Those congesting the list with with either of the above will have posting rights revoked
or moderated. Only by following these simple rules will we have a "clean" archive.
They also reduce inbox clutter and make digests much nicer to read.

If you do not wish to belong to TekScopes, you may
unsubscribe by sending an email to

TekScopes-unsubscribe@yahoogroups.com

You may also visit the Yahoo web site to modify your
subscriptions:

http://groups.yahoo.com/mygroups

Check out the files, bookmarks, and photos sections,
and remember, you can search the group's archives from its home page,
or when reading messages. The group's home is at: http://groups.yahoo.com/group/TekScopes

Regards,
Michael Dunn
Moderator, TekScopes
7904 wanted for parts - problem with my scope..

Mike D.
 

Dear Colleagues,

I have two questions:

My 7904 "focus control" is not fully functional. When the pot is
swung through about 75% of its travel the trace reaches a point of
almost perfect focus but any further travel does nothing. Is it as
simple as a faulty pot? Any ideas for troubleshooting?

I am searching for another 7904 that I can use to salvage parts
from. If anyone has a dead one laying around please drop me an email
at DrD@2020.com

Regards,

Mike, K4MMR
DrD@2020.com
Charlottesville, VA 22901
looking for SC503

eboytoronto
 

I am looking for a broken SC503 oscilloscope with a good high voltage
section. I do not need the tube or any case parts etc.


Can anybody help ?

Sincere regards,


John Barnes
Re: 7A26 problem

Doug Hale <doughale@...>
 

Sorry Don,
I don 't have a 7A12 or Manual. There is one on eBay right now (http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&;item=1743215996)
but $30 seams a little high however one sold for 39.99 and one one didn't sell for 14.99 (http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&;item=1740382396)
Again, there are venders on this list, and on the web.

Sorry again,
Doug


Don Black wrote:

Hi Doug,
I've been trying to get a schematic for a 7A12 plugin without
success. Would you have a copy of this that I could impose on you to scan for
me please.
Thanks (fingers crossed), Don
Black.

Doug Hale wrote:


Craig,
I have the scematic in front of me now and I don't see how only one
channel could be effected by the 20Mhz BW limiter. The BW limiter is in
the final stage after the two channels are mixed and just before the
backplane. This stage consists of two differental common base stages.
One w/o BW limiting (Q820&840) and one w/ a low-pass BW limiting
filter(Q860&880). The switch controls the base bias voltage which
enables/disables one or the other(+11.5 OFF/+9.8 ON).
Since both channels are mixed with summing resisters (R802, 804,
810/812, 814, 810) at the input to this stage, I don't think this is the
problem area. It is probably the channel amplifier itself.
If you wish, I can scan the schemos for you tonight but it would be
well worth it for you while to aquire a manual - they are availible from
other members of this list, from ebay, and from venders on the web.

Doug Hale

Craig Sawyers wrote:


Hi folks

I've a 7A26 with a problem (just discovered). The 20MHz bandwidth switch
only works on one of the channels of the plug-in. The other channel is
permanently 20MHz.

Yes - I've just spent a cheerful half hour wondering where my signal
was.....

I don't have a manual for the 7A26, so any pointers from anyone with a
schematic would be most welcome.

Cheers

Craig



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Re: 7A26 problem

Doug Hale <doughale@...>
 

Craig,
I have the scematic in front of me now and I don't see how only one channel could be effected by the 20Mhz BW limiter. The BW limiter is in the final stage after the two channels are mixed and just before the backplane. This stage consists of two differental common base stages. One w/o BW limiting (Q820&840) and one w/ a low-pass BW limiting filter(Q860&880). The switch controls the base bias voltage which enables/disables one or the other(+11.5 OFF/+9.8 ON).
Since both channels are mixed with summing resisters (R802, 804, 810/812, 814, 810) at the input to this stage, I don't think this is the problem area. It is probably the channel amplifier itself.
If you wish, I can scan the schemos for you tonight but it would be well worth it for you while to aquire a manual - they are availible from other members of this list, from ebay, and from venders on the web.

Doug Hale

Craig Sawyers wrote:

Hi folks

I've a 7A26 with a problem (just discovered). The 20MHz bandwidth switch
only works on one of the channels of the plug-in. The other channel is
permanently 20MHz.

Yes - I've just spent a cheerful half hour wondering where my signal
was.....

I don't have a manual for the 7A26, so any pointers from anyone with a
schematic would be most welcome.

Cheers

Craig



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Needed: Schematic and/or any info for 335

Michael <m_d_d@...>
 

Hi all,

A friend of mine is trying to repair a Sony/Tektronix type 335 scope. He
has no schematics, no info at all, but has narrowed the problem down to
the
sweep gen / horiz section.

Problem is no horiz deflection unless in x-y mode.

Can anyone assist with schematics or any useful info at all?

Thanks and regards,
:)
Michael Dunn
(Australia)
7A26 problem

Craig Sawyers <c.sawyers@...>
 

Hi folks

I've a 7A26 with a problem (just discovered). The 20MHz bandwidth switch
only works on one of the channels of the plug-in. The other channel is
permanently 20MHz.

Yes - I've just spent a cheerful half hour wondering where my signal
was.....

I don't have a manual for the 7A26, so any pointers from anyone with a
schematic would be most welcome.

Cheers

Craig
7788 tubes and the 545B

excavatoree
 

Is there any circuit modification that I can make to a 545B to allow
the use of a more inexpensive and more readily available tube than
the 7788?
Re: 453A CRT HV Problem

Stan & Patricia Griffiths <w7ni@...>
 

This is more likely to be a problem with the door knob cap shorting than the
CRT. You can disconnect the CRT and see if just connecting the door knob
cap kills the high voltage. If not, then the door knob is probably good.
The last thing is the CRT itself and if connecting and disconnecting it
causes the HV to fail and come alive, then I would say it is probably the
CRT. Replacement door knobs for a 453A can be found. CRT's are much harder
to find.

Stan
w7ni@easystreet.com

----- Original Message -----
From: "zs5la" <cohenro@vodacom.co.za>
To: <TekScopes@yahoogroups.com>
Sent: Thursday, May 30, 2002 7:14 AM
Subject: [TekScopes] 453A CRT HV Problem


I wonder if any of you could help me out here. I have a 453A where
the HV section (12kV) does not seem to work. When I disconnect the
12kV from the big doorknob cap in the HV section to the CRT, then
everything seems to work, except no trace, and I can arc a nice spark
from the cap to the HV wire going to the CRT. When I connect the HV
wire back onto the cap then all fails. I can still hear the
transformer oscillating away at a high pitch, but no voltage. Could
the CRT be faulty from the anode side somehow shorting internally to
GND or am I missing something in the HV power supply section? The
resistance of the anode to pin 12 on the CRT is very high when
measuring with a Fluke ohmeter. Is it common for CRT's to fail like
this?

Thanks.



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