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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 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

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:

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

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.

Someone with more money than sense, Phil.

Craig

Jim,

We had a long discussion about copyright last year. If we were to
have a private library for anything not specifically in the public
domain we should have no copyright problems. If you own the
instrument you probably purchased the copyright to the documentation
with it, so you are entitled to the information.

John Stanton

--- In TekScopes@y..., "Jim Nunn" <jimnunn0000@e...> wrote:

I have an underused FTP site, so if you would like to place your
complete manuals on it and make it a group resource, let me know
(atjstanton@v...).

John

Setting up a library of Tek manuals on the web would be extremely

useful to

the Tek collector community assuming that we do not break any

copyright

laws. Perhaps Tektronix would grant us permission for the older

manuals

that they no longer support.

I would be happy to scan my manuals,500 series and plugins and

supply them

in PDF format for your web page.

Jim Nunn

jimnunn0000@e...

Hello jim
I have a service manual for a 7904A which I would be glad to swap for
something that I don't have. I am trying to find manuals for a number of
plugins as well as for some non Tek stuff, ie. an Hp 3580a. as well as some
of the low capacitance relays used in the 7A11 in the attenuator.

Regards from down under
William de Bruyn

I have an underused FTP site, so if you would like to place your
complete manuals on it and make it a group resource, let me know
(atjstanton@...).

John

Setting up a library of Tek manuals on the web would be extremely useful to
the Tek collector community assuming that we do not break any copyright
laws. Perhaps Tektronix would grant us permission for the older manuals
that they no longer support.

I would be happy to scan my manuals,500 series and plugins and supply them
in PDF format for your web page.

Jim Nunn

jimnunn0000@...

Jim,

I have an underused FTP site, so if you would like to place your
complete manuals on it and make it a group resource, let me know (at
jstanton@...).

I have some PDF manuals I can share as well.

Regards

John Stanton

Jose,

We used to ship items that size overseas (computer workstations and
monitors) and found that Airborne offered good freight rates. From
memory their rate for a shipment larger than yours from USA to
Australia was about $100. Spain is closer than that.

There is another way. United Airlines are offering round trip
tickets from US cities to European cities for less than $300.00.
Come and pick it up! When it costs the same to ship a person round
trip as the freight for a scope, you are paying too much for freight.

If you need more freight help, contact me at jstanton@....

Regards

John Stanton

--- In TekScopes@y..., "JOSE V. GAVILA (EB5AGV/EC5AAU)" <eb5agv@c...>
wrote:

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:

--- 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