Date   

Re: 465 M - no trace problem.

RICHARD W. MURRAY
 

-----Original Message-----
From: kiyoinc@attglobal.net <kiyoinc@attglobal.net>
To: Tekscopes@yahoogroups.com <Tekscopes@yahoogroups.com>
Date: Tuesday, October 29, 2002 12:38 PM
Subject: [TekScopes] 465 M - no trace problem.


Background - I'm a software type, not hardware. Last year, two
things happened. My local gas station stopped selling gas and I had
a hand surgery that went bad.

Bear with me, this makes sense.

After a month, I asked the station owner about the gas problem. He
had a computer failure in the TOKHEIM dedicated controller and
could not afford the $5,000 for repairs. I found a replacement
controller and spent a couple days configuring his system.

A year later, his system failed again in a different area. During an
electrical storm, the network that connects the office console to
the embedded computers in the pump failed.

I tried diagnosing this with my DMM but couldn't make much sense out
of it. No manuals for the LAN, and I'm a software type (M.S.
Computer Science).

About a year ago, as part of the therapy for my hand, I started
refurbing old SSB radios that others had given up on. I have
repaired 5 SB-303's and a SB-200. I have an SB-104A, SB-102, and a
Signal/One CX7A to work on.

I've found mostly bad caps, bad resistors, and lots of dirty
contacts.

A couple months ago, I bought a Tektronix TDS-210. I figured I
could use it for the SSB radios and I really needed to see the
signals on the gas pump's Lan.

Two problems. The 210 is a digital sampling scope and analog scopes
are easier to use on RF applications. I don't really want to take
an expensive white lab scope into the grease bay of a gas station.

I don't get paid to fix the guy's system. He's just a struggling
small business who needs a couple breaks.

Using the TDS 210, I isolated the fault to "probably" an $80 board
in the pump. I've ordered a replacement part.

So...

I was at a hamfest last weekend and bought a Tektronix 465. The
seller said that it lights up but they can't get a trace.

Indeed, the LEDs and reticle illuminator work but there's no trace.

I opened the scope and a found a blown 1/4 amp fuse. It is near the
rear, just in front of the HV supply and mounted on standoffs.

I replaced the fuse and it blew w/in a second or two of applying
power.

Now what? How do I fix this?

I don't like working around HV but I can. The SB-200 is a
vacuum tube linear amplifier with 2,000 VDC at 600 milliamps in it.
It had power supply problems.

Any tips or guidance on how to get the 465 working?

de ah6gi/4


Don't know if this will help but several years ago the HV power on by 7704 went south. Tektronix tried to fix it but couldn't supply the parts. I tore it down and found that the HV tranformer, looked a lot like a TV flyback transformer if I recall correctly, was arcing. If it is you'll notice the ozone odor, and see the black arc lines. I repaired it by coating the transformer with several layer of expoxy. Worked like a charm until one of the horizontal sweep push pull (at least that's what it looked like) died. This was my first tek scope.

Regards

Richard


2230 service manual?

Brian
 

Just recently I bought a used tek2230 scope. Unfortunatly I haven't
been able to get a service manual as of yet.. I was wondering if
there's anyone out there that might be able to help me.. Maybe
someone would be willing to sell me a good copy or something..
Please feel free to email me at: bd_ski@yahoo.com. Hey - thanks in
advance to anyone who responds. I appreciate it. Hopefully someone
can help me.

Sincerely
Brian,


Re: TEK 2230 Power UP and Service manual

Brian
 

Hello Don,

Hey I saw this message on the yahoo group, and I was wondering if you
had ever found a service manual for your tek2230. I've just recently
bought one myself, and I don't have a users or service manual for
it. I was hoping that you might be able to help.

Brian

--- In TekScopes@y..., "Don Crano" <donc@s...> wrote:
Does anyone happen to have a Service Manual for the Tek 2230, they
would
like to sell?

And does anyone know what the power up error:
CDT : uncaled : min = 84
might be about.


Thanks in advance!

Don


Re: T-1000 mod kit for the RM529?

Stan & Patricia Griffiths <w7ni@...>
 

Comments below:

----- Original Message -----
From: "Morris Odell" <morriso@vifp.monash.edu.au>
To: <donlcramer@cs.com>; <TekScopes@yahoogroups.com>
Sent: Monday, October 28, 2002 1:24 PM
Subject: RE: [TekScopes] T-1000 mod kit for the RM529?


As to why they did this, I remember reading somewhere that the 529 was the
most popular item Tek ever made. When you think about it, just about every
TV station or production studio would have had a few of them. That's a lot
of monitors! They still command quite a high price if you look at websites
that sell TV production equipment.
I believe th 7A26 was the most popular item Tek ever made . . .

The 7788 was never a common tube and is very expensive. I suspect the mod
was intended to allow these monitors to function well past the time when
7788s were no longer being made.

There might be a similar explanation as to why the vertical output stage
in
the 547 is solid state (and looks a lot like what's in my 529), while the
545B uses 7788s. AFAIK the 546 which came between the two was never all
that
popular - anyone ever seen one?
Well . . . I have one in my collection . . . are you surprised? Anyway, the
546 is exactly like the 547 without the sweep switching circuitry. It was
only made to get the price down a couple of hundred dollars and it wasn't
popular because most scopes are bought "fully loaded" . . . which the 546
was not . . . 547's were bought mostly by companies and the buyers were not
spending their own money so they did not care much about saving a couple of
hundred dollars on the purchase.

This reminds me of the time I was selling 547's to Western Electric in North
Andover, MA in about 1971. Since hardly anyone ever used the delayed sweep
feature, I suggested they could save a little money on there budget if they
were to specify the 544 instead of the 547. I was quickly informed that if
they should EVER need the delayed sweep feature, they would have to go back
for the purchase of another scope. Lots of questions would be raised about
why they did not buy the "right" scope in the first place. Black marks
would be entered into their employee records. The obvious solution is to
buy the "fully loaded" model in the first place since no manager would EVER
think to ask if anyone ever actually USED the delayed sweep feature . . . I
often wondered why most scopes were sold with delayed sweep when only 1% of
them were ever used. Call it "insurance", I guess . . .

Stan
w7ni@easystreet.com


Re: T-1000 mod kit for the RM529?

Stan & Patricia Griffiths <w7ni@...>
 

After calling this auction up and looking at it, I suspect this is NOT a kit
made and offered by Tektronix. I am betting this is an "after market" kit
made by someone else. Frankly, it would not be like Tektronix to offer such
a kit today. Rather, they would like to see the 529 go obsolete and
unrepairable so you would have to buy a new instrument from them . . .

The format of the kit, style of print in the instructions, and lack of a
Tektronix "040 Kit number" supports my suspicians. Hey, it might work just
fine, however . . .

Stan
w7ni@easystreet.com

----- Original Message -----
From: <donlcramer@cs.com>
To: <TekScopes@yahoogroups.com>
Sent: Monday, October 28, 2002 1:00 AM
Subject: [TekScopes] T-1000 mod kit for the RM529?


Interesting item on ebay (http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&
item=1391598657&rd=1) showing a solid state mod kit which, according to
the
listing, replaces (2) 7788 pentodes in the RM529. An interesting sight,
on
first glance looking like a T0-220 heatsink on a post attached to a 9 pin
tube socket plug.

I know the 7788 is a very high performance tube, and quite expensive, but
I'm
curious what drove Tek to come up with such a mod. That is, if the
application warranted those tubes in the first place, I would have thought
that the solid state parts of the period were not as good (?). It seems
like
a lot of trouble to go to in any case. Was this a mod purely on economic
grounds, or was the 7788 susceptable to some early failure in this
particular
application?

Don








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Re: Hey, Stan Griffiths!!

Stan & Patricia Griffiths <w7ni@...>
 

I really appreciate the nice words about out site. I want to assure you
that Bill and I still intend to keep the site up. We think the reference
data is valuable, too, and we intend to add to it in the future. Bill has
recently added a lot more probes to the probes data base and a section on
how to properly select a probe for your scope. You should check that out.
We still have several more years of probes to add to it so it is not
finished yet. I plan to add a reference section on ceramic strips and make
a bunch of them available for sale. I have overcome the problems with
shipping Tek Blue and Tek Gray paint in spray cans in the U.S. so it is now
available at $15.00 per can plus shipping and I have it in stock. I will be
putting this in my "Parts Shop" on my web page soon . . .

Bill has never asked for money to support the site. I am sure he
appreciates the offer. The plan for the forum on our site is to fix the
problems that make it run so slow. I think when Bill does this, he will not
be able to retain the old postings, however. That is all that will be lost.
I think it is well worth the sacrifice in order to get a forum that works
faster. You may have noticed that you don't see many postings or answers
from me there. This is simply because I don't have the spare time to wade
through it. You should see my comments there often after Bill gets it
fixed.

The idea of committing the reference files to CD is an interesting one. As
you know, I plan to make a LOT of CD's aboutTek stuff in the future and
putting some of this reference data on CD is quite possible. All I need is
time to do it . . . What I REALLY want to do with my time is restore my
hundreds of Tek instruments, but I never seem to be able to get to that . .
.

Stan
w7ni@easystreet.com

----- Original Message -----
From: "Ashton Brown" <ashton@vom.com>
To: "TekScopes" <TekScopes@yahoogroups.com>
Sent: Thursday, October 24, 2002 12:03 AM
Subject: Re: [TekScopes] Hey, Stan Griffiths!!




deanhuster wrote:

I notice that the original Tek forum operated by you and Bill Den
Beste (http://www.reprise.com/host/tektronix/home/ )is being
discontinued. I hope that your main web page will still be intact.
Your site was my original contact with Tek enthusiasts on the Web and
I've always appreciated it. To me, your "third-party" Tek site looks
more like the Tektronix that I knew when I worked for them than Tek's
corporate site does. In any event, thank you very much for all of
the time and money that you've put into your efforts to support older
Tektronix gear. A lot of folks owe much to you.

Dean Huster
Stan -
Adding my own appreciation, and for the phone time to be of assistance,
quite before eBay was more than a blip. I do hope that the excellent
ref. pages will continue to be available? TANSTAAFL of course - I for
one would be willing to contribute to overhead of whatever repository:
the data won't ever be obsolete and should not be lost IMho. I wonder
how many might kick in a few $ for such a project.. Hmmm - CDs of the
content? Price to cover the hassle, not just the disc.

Regards,
Ashton
(No. Calif. - Sonoma County)


ATTENTION: Mike Dunn

Stan & Patricia Griffiths <w7ni@...>
 

Sorry for posting this to everyone, but I have sent you several emails all
of which have bounced. I need to talk to you. Please let me know your
current email address.

The email address I have for you is:

mdunn@contares.on.ca

Stan
w7ni@easystreet.com


465 M - no trace problem.

kiyoinc@...
 

Background - I'm a software type, not hardware. Last year, two
things happened. My local gas station stopped selling gas and I had
a hand surgery that went bad.

Bear with me, this makes sense.

After a month, I asked the station owner about the gas problem. He
had a computer failure in the TOKHEIM dedicated controller and
could not afford the $5,000 for repairs. I found a replacement
controller and spent a couple days configuring his system.

A year later, his system failed again in a different area. During an
electrical storm, the network that connects the office console to
the embedded computers in the pump failed.

I tried diagnosing this with my DMM but couldn't make much sense out
of it. No manuals for the LAN, and I'm a software type (M.S.
Computer Science).

About a year ago, as part of the therapy for my hand, I started
refurbing old SSB radios that others had given up on. I have
repaired 5 SB-303's and a SB-200. I have an SB-104A, SB-102, and a
Signal/One CX7A to work on.

I've found mostly bad caps, bad resistors, and lots of dirty
contacts.

A couple months ago, I bought a Tektronix TDS-210. I figured I
could use it for the SSB radios and I really needed to see the
signals on the gas pump's Lan.

Two problems. The 210 is a digital sampling scope and analog scopes
are easier to use on RF applications. I don't really want to take
an expensive white lab scope into the grease bay of a gas station.

I don't get paid to fix the guy's system. He's just a struggling
small business who needs a couple breaks.

Using the TDS 210, I isolated the fault to "probably" an $80 board
in the pump. I've ordered a replacement part.

So...

I was at a hamfest last weekend and bought a Tektronix 465. The
seller said that it lights up but they can't get a trace.

Indeed, the LEDs and reticle illuminator work but there's no trace.

I opened the scope and a found a blown 1/4 amp fuse. It is near the
rear, just in front of the HV supply and mounted on standoffs.

I replaced the fuse and it blew w/in a second or two of applying
power.

Now what? How do I fix this?

I don't like working around HV but I can. The SB-200 is a
vacuum tube linear amplifier with 2,000 VDC at 600 milliamps in it.
It had power supply problems.

Any tips or guidance on how to get the 465 working?

de ah6gi/4


Re: The Tek 546

Dave Wise
 

In a corporate setting, you may get in trouble
if you buy an instrument laden with unused features,
but you're *sure* to get in trouble if you have
to go back and buy a second one because the first
one was inadequate. This leads to overspecification.
Also, Tek may not have been too eager to kill off
the 545B which was probably a good money-maker, so
they may have overpriced its supposed replacement.

Dave Wise

-----Original Message-----
From: John Doran [mailto:johnd@epiloglaser.com]
Sent: Monday, October 28, 2002 1:59 PM
To: TekScopes@yahoogroups.com
Subject: [TekScopes] The Tek 546



Morris Odell asked if anyone had seen a Tek 546. I have!

I bought one in the mid eighties, in perfect condition. It served
me well as my principal lab 'scope for years, until I replaced
it with an HP 54602A; at that time, I sold the 546 at a local
hamfest.

The HP (a digital storage 'scope) does the job, but it is not nearly
as fine an instrument as the Tek. I really miss the big old thing...

The 546 is essentially a 547 without the dual-alternate-trace
feature--it functions rather like a higher-bandwidth 545B. I
suspect that the reason the 546 is so rare is simply that most
buyers perceived that the 547 had a better price/performance
ratio and bought it instead.

-John


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Re: T-1000 mod kit for the RM529?

Dave Wise
 

-----Original Message-----
From: Morris Odell [mailto:morriso@vifp.monash.edu.au]
There might be a similar explanation as to why the vertical
output stage in
the 547 is solid state (and looks a lot like what's in my
529), while the
545B uses 7788s. AFAIK the 546 which came between the two was
never all that
popular - anyone ever seen one?
My memory of this is about 20 years old. I looked inside
a 545A, then inside a 545B, and was amazed at how little
"stuff" there was in the B vertical area. Ever since then
I've thought the 545B vertical output was solid-state.

Dave Wise


The Tek 546

John Doran <johnd@...>
 

Morris Odell asked if anyone had seen a Tek 546. I have!

I bought one in the mid eighties, in perfect condition. It served
me well as my principal lab 'scope for years, until I replaced
it with an HP 54602A; at that time, I sold the 546 at a local
hamfest.

The HP (a digital storage 'scope) does the job, but it is not nearly
as fine an instrument as the Tek. I really miss the big old thing...

The 546 is essentially a 547 without the dual-alternate-trace
feature--it functions rather like a higher-bandwidth 545B. I
suspect that the reason the 546 is so rare is simply that most
buyers perceived that the 547 had a better price/performance
ratio and bought it instead.

-John


Re: T-1000 mod kit for the RM529?

Morris Odell <morriso@...>
 

Don said:


solid state mod kit which,
according to the
listing, replaces (2) 7788 pentodes in the RM529.

I know the 7788 is a very high performance tube, and quite
expensive, but I'm
curious what drove Tek to come up with such a mod. That is, if the
application warranted those tubes in the first place, I would
have thought
that the solid state parts of the period were not as good
(?). It seems like
a lot of trouble to go to in any case. Was this a mod purely
on economic
grounds, or was the 7788 susceptable to some early failure in
this particular
application?
My 529 (non-RM) has been modified with two TO-5 transistors mounted on
ceramic disks in the old tube socket holes. It works just fine. The chassis
is still silk-screened for the 7788s. I must say I was relieved when I saw
that, as 7788s are very thin on the ground. The only other tubes in it are a
12AT7 and a 6GV8, both much easier to find and cheaper than a 7788.

As to why they did this, I remember reading somewhere that the 529 was the
most popular item Tek ever made. When you think about it, just about every
TV station or production studio would have had a few of them. That's a lot
of monitors! They still command quite a high price if you look at websites
that sell TV production equipment.

The 7788 was never a common tube and is very expensive. I suspect the mod
was intended to allow these monitors to function well past the time when
7788s were no longer being made.

There might be a similar explanation as to why the vertical output stage in
the 547 is solid state (and looks a lot like what's in my 529), while the
545B uses 7788s. AFAIK the 546 which came between the two was never all that
popular - anyone ever seen one?


Morris


2445B fault or "feature"

andy_warne
 

Hi,

Just purchased a 2445B which seems to work fine. One small issue,
when pressing "measure", after the measurement is complete, the trace
brightness turns down. This may be normal so that the results can be
seen, but I would expect the brightness to come back up but after
clearing the results by pressing any button. But it doesnt. The only
way to get it back is turn the brightness control right down and then
back up again. Is this normal? This question would also apply to the
2465B which is virtually the same.

Andy


Manual for TEK 222 Digital Scope

ebayatessnh
 

I just bought a Tek 222 portable digital scope. Does anyone know
where I can find a reasonably priced manual for it? Would be willing
to trade for a scan of a several 7000 or TM500 series plug in manuals
that I have.

Dave


T-1000 mod kit for the RM529?

donlcramer@...
 

Interesting item on ebay (http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&
item=1391598657&rd=1) showing a solid state mod kit which, according to the
listing, replaces (2) 7788 pentodes in the RM529. An interesting sight, on
first glance looking like a T0-220 heatsink on a post attached to a 9 pin
tube socket plug.

I know the 7788 is a very high performance tube, and quite expensive, but I'm
curious what drove Tek to come up with such a mod. That is, if the
application warranted those tubes in the first place, I would have thought
that the solid state parts of the period were not as good (?). It seems like
a lot of trouble to go to in any case. Was this a mod purely on economic
grounds, or was the 7788 susceptable to some early failure in this particular
application?

Don


(No subject)

Marcello Pellerano
 

Hello, I've just upload the Tek 465/475 specs file.
It's called "Tektronix 465, 475, 475A Series Oscilloscopes Specifications", and it is a ".pdf" zipped file.
Marcello


Tek manual copyright

Craig Sawyers <c.sawyers@...>
 

From time to time there is a debate concerning Tek's willingness or
otherwise to allow manuals to be put on websites for download.

Purely for information, the Collins Collector's Association got permission
from Rockwell Collins to reproduce anything to do with Collins radio
equipment. The form of words that was used to give them permission is shown
at http://www.collinsradio.org/html/archives.html

Craig


tek 7623 main frame

eric baynes <bebaynes@...>
 

Hi I'm trying to fix a 7632 mainframe just need a circuit of the power supplys

is there any online circuits on offer ?

regards eric baynes



---------------------------------
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Electronic manual of the T.465

pa1ao <pa1ao@...>
 

Hi All,

Does anyone have or know where I can find the specs of my
recently purchased Tek.465 ?

Thanks in advance,

Arjan
The Netherlands


Re: 535/545 Manual on line (first 93 pages)

Craig Sawyers <c.sawyers@...>
 

Just uploaded the first 93 pages of the 535/545 manual.
The schematics,next week.
That's a very high quality scan - thanks! Just downloading the thing....

Cheers

Craig

184501 - 184520 of 186887