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--- In TekScopes@y..., "Craig Sawyers" <c.sawyers@t...> wrote:

I cut open the offending electrolytic on my
machinist's lathe and removed the insides. Still "wet" but
open in both cases. Then soldered in an equivalent replacement axial
unit from da-shak.com and sealed the can back on

That's a perfectly respectable repair technique! I did all the
electrolytics in a piece of German WWII cipher equipment that way. Cut
around the seal with a Dremel and used a modern component inside, then
sealed the cap back on with epoxy. This was the only one of these

machines

left complete in the world, so I was *very* pernickety about getting the
appearance historically correct.

Craig

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

Gaston

I was sort of thinking of adding this 512 on eBay to my collection. It would have been good company for my 511AD and 514. I was stunned to see it go for $315. The last one I recorded for my price tables went for $5.



Phil

Here are some more links to equipment manuals,
training manuals, and a lot more.

www.usace.army.mil/usace-docs/

www.usapa.army.mil/links.html
www.adtdl.army.mil/atdls.htm


On the pubs.ala.usmc, just click on the space to
search in (but leave it blank) and press enter. All
8000+ documents will show up with links. It does take
a while.

Jim Reese


--- Jim Reese <nfeinc@...> wrote:

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!

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

I have also noticed that the "Gold" plating can be suspect also. I have
"repaired" several
7000 series plug-ins by cleaning the contacts.

73, Dick, W1KSZ

I cut open the offending electrolytic on my
machinist's lathe and removed the insides. Still "wet" but
open in both cases. Then soldered in an equivalent replacement axial
unit from da-shak.com and sealed the can back on

That's a perfectly respectable repair technique! I did all the
electrolytics in a piece of German WWII cipher equipment that way. Cut
around the seal with a Dremel and used a modern component inside, then
sealed the cap back on with epoxy. This was the only one of these machines
left complete in the world, so I was *very* pernickety about getting the
appearance historically correct.

Craig

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!

In re: manuals
I'm pretty sure I know where he downloaded the manuals from and it is true
that most of them are calibration manuals and parts lists but
there are some
complete service manuals also. Did you not get a 3.6MB service
manual on the
7B92A? I'm pretty sure I saw that in his ad.

I downloaded the 7B92A, yes.

Now I have a question. He also mentioned a manual for a 7613 scope and I
know he didn't get that from the military site I know about. Was it there?
Or was he fibbing?

He was fibbing, but not too much. The 7623 manual is there.

The site seems to be down, BTW - haven't been able to get onto it for a week
or more.

Regards

Craig

Hello!

I have located a very nice Tektronix 7904 / 7B92 / 7A16A / 7A13 system but
have the _small_ problem of shipping it from USA to Spain. It is already
professionally packaged but quoted price is $295 (by FedEx). I wonder if
there is any other way to send such an item to Spain, without incurring in
so large expenses. Perhaps some of you have experiences sending items
overseas?

Thanks!

JOSE
----------------------------------------------------------------------
73 EB5AGV / EC5AAU - JOSE V. GAVILA
La Canyada - Valencia (SPAIN)

EB5AGV Vintage Radio Site:

European Boatanchors List:

Hi,
when i get something at ebay "as-is", i usually start cleaning it, so i don't get dirty fingers when working on it. Especially the high-voltage supply tends to
attract dirt. It has to be clean in order to get reliable regulation. There have been a lot of mails about washing in this group, that you may want to read.

Try to avoid touching adjustment pots on the pc boards during cleaning. You may later discover you have a perfect calibration, which will save you some work.

Then take your time for a visual inspection. Put your glasses on and get close!

You will eventually discover loose parts, for example transistors hanging half out of their sockets. You may discover bent parts making contact where they should
not. Or you find lost screws etc. I once received a 7903 mainframe with a loose inductor inside its switching power supply. A spring had fallen off. If i had
turned it on without discovering and fixing it - most likely the power supply would have been destroyed.

The visual inspection also lets you discover former repairs, which have a certain tendency to cause problems again... Try to understand how things are mounted and
whether all screws are there!

It's also a nice idea to move each socketed part a little bit so the contacts refresh. I try to do it systematically.
Sometimes internal plugs are loose and not completely plugged in. Many of those plugs don't have locks, but slide out as easy as they slide in. This also applies
to jumpers.

Plastic parts seem to shrink after 20 years. If you have a large pc board mounted tight onto a metal frame, loosen the screws and tighten them again. Thus you can
take the bending force away. Then it comes to moving parts like switches. Plastic parts in switches may have developped additional movements in some strange
directions due to wear-out. This may cause unreliable switching. To fix this requires inserting some extra washer or so, or you may need replacement parts.

Another typical problem of old equipment: It takes some effort to get front panel knobs off if you have to, because people tend to destroy the mini-screws that
hold them.

The good news: Tek electronics is well designed and made of high-quality components, that will rarely fail. Problems i remember having to fix in about 20 old
plugins and scopes i have:

- Short in a blue 100uf tantal capacitor, sitting right across the +15V supply in a plugin. Maybe somebody pushed the plugin into a running scope. This doesn't
apply to you, since the 475 doesn't have plugins.

- Short of a bus line to ground in 2465 processor board (board shrinking?). It caused a bad EPROM, too.

- A broken front panel lamp.

- The axis of a front panel control and the knob had been broken off and were lost.

If you start using your scope for some meaningful work, you will find more little bugs, like the ventilator has to be replaced, because it is noisy. By the way: If
you can afford it, get the service manual for your equipment, the sooner the better. Then you have a good chance to keep your Tek alive "forever".

So thats about all i can think of. Good luck!
Dieter Teuchert

Lawrence Lewis wrote:

From: Craig Sawyers [mailto:c.sawyers@...]

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

Shoot, you're absolutely right. I was only off by one bit,
TMSAISTI. :-)

Dave Wise

In re: manuals
I'm pretty sure I know where he downloaded the manuals from and it is true
that most of them are calibration manuals and parts lists but there are some
complete service manuals also. Did you not get a 3.6MB service manual on the
7B92A? I'm pretty sure I saw that in his ad.

Now I have a question. He also mentioned a manual for a 7613 scope and I
know he didn't get that from the military site I know about. Was it there?
Or was he fibbing?

In re: CRT life
I once bought a Panasonic monitor because of the $40 rebate. I never got the
rebate so I swore off Panasonic monitors. Ten years later, when the
Panasonic monitor was still working and all the other monitors I'd bought
since had been replaced at least once (I sell computer systems so I'm
talking about a bunch of monitors), I forgave
Panasonic. If a monitor today lasts three years, I'm tickled pink. I still
have the Panasonic and, although its not plug-and-play, it works fine with
the new computers after twelve years.

When I was working my way through college fixing Televisions, we would
"rejuvenate" CRTs. If the cathode wasn't emitting like it should, the
rejuvenator would run the heater at a higher voltage for a while to "boil
off" the oxidation. If the cathode was shorted to a grid or if two grids
were shorted together, the rejuvenator would send a high voltage pulse
through the short to, hopefully, burn it out. Of course, sometimes the CRT
didn't survive the rejuvenation but if it did, it usually worked better.
Can you do this with oscilloscope CRTs and DVSTs?

I picked up a 475 and 465 DOA at swap meet. Open Electrolytics
ibn both. I cut open the offending electrolytic on my
machinist's lathe and removed the insides. Still "wet" but
open in both cases. Then soldered in an equivalent replacement axial
unit from da-shak.com and sealed the can back on with
kapton tape. You have to be careful removing the old
electrolytic because sometimes critical traces are on
the back of the board where things are hard to see and reach.

Not exactly a mil-spec repair, but so far it
works great and is electrically sound, in IMHO.

Now I have a spare scope. Anyone in the group looking for
a 465 or 475?

TekScopes@... wrote:

Hi all -

I just bought a used 475a/dm44. While the scope seems to works fine, in general, what kind of problems should I expect to see or check? Dried up electrolytics?

Thanks.

Larry Lewis (Tektronix TM500 group 1976-78)
--

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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.

Yeah - there are a load of scams out there. There is only one eBayer who I
know to be completely straight with what you get, and only auctions complete
military manuals, and that is Tom Gootee (also a Tekscopes guy too).

Craig

Hi all -

I just bought a used 475a/dm44. While the scope seems to works fine, in general, what kind of problems should I expect to see or check? Dried up electrolytics?

Thanks.

Larry Lewis (Tektronix TM500 group 1976-78)
--

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Sign-up for your own FREE Personalized E-mail at Mail.com



1 cent a minute calls anywhere in the U.S.!

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

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.

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

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

Hi John and all the List,

Impressive collection! I had no idea you had so much stuff. :)

Shhhhhhh.... my wife could hear you ;-)!

... What's the
plugin in your R7603? It looks like a spectrum analyzer of some sort but I
don't recognize it.

Is is a 7D20. Sorry for the poor picture; I took it without flash and,
well, it is not one of the best. But I wanted to put the page on the WEB,
as it was about a year (!) since last update. BTW, I have doubled the
number of items in that year... this is getting dangerous :-)!

Thanks to everybody who visited my Test Equipment page. I will let you know
when I put there my restoration stories; as usual, I will put pictures
before and after work, along explanation of repair and detailed pictures of
damaged / faulty zone.

Best regards,

JOSE
----------------------------------------------------------------------
73 EB5AGV / EC5AAU - JOSE V. GAVILA
La Canyada - Valencia (SPAIN)

EB5AGV Vintage Radio Site:

European Boatanchors List:

There's a grain of truth in that. I find my wife now reads the TekScopes
emails I receive. She "called me" on my previous comment on her opinion of
my Heathkit TV!

I suspect I will meet all of you soon enough. We'll all be in a mandated
meeting, saying things like "Hi. My name is Don and I am a test equipment
junkie". And it will be said that admitting the problem is half the battle.
But somehow it seems it is still not a problem for me----which may be a
symptom in itself!


In a message dated 1/23/02 10:45:53 PM Pacific Standard Time, eb5agv@...
writes:

Impressive collection! I had no idea you had so much stuff. :)

Shhhhhhh.... my wife could hear you ;-)!