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Several years ago I was bitten by the Tekscope bug and eventually
accumulated fourteen different scopes. I finally realized that
many of them just sit around looking nice and gathering dust, so
would like to sell some. The big 5's just cost too much to ship
nowadays so I'm probably stuck with them (I also have a nice 515A
I'm not using if anyone's interested).

Anyhow the 310A and the 317 are both working (see pics).








(I cleaned the storage dust and dirt off them after taking the
calibrator trace pics. They aren't rusty).

I'll throw in the P6027 (1X probe) that came with the 310A.

The 317 is missing the right cabinet panel and I don't have a
spare power cord for it. Otherwise complete.

Please make reasonable offers ("silent auction") before I put them
on that auction place. Shipping on your dime from zip 65775 (US).

thanks
Charles

--- In TekScopes@..., Andre Majorel <aym-scinortcele@...>
wrote:

Hello all. Are there any known problems with using a 535A in
vertical position, i.e. with the fan at the rear looking down and
the front panel looking up ?

--
André Majorel <URL:>
Do not use this account for regular correspondence.
See the URL above for contact information.

The only thing I can think of, and it is a stretch, is that now the
Mumetal cone has its open ends the wrong way around. Maybe the CRT
isn't shielded the same way it was before. But it's a given that you
have to adjust the trace rotation when you move the scope.

FYI
Had an issue with a recently acquired 3A6 - trace switching multivibrator
was inop. Contact cleaning and reseating the transistors did the trick. The
interesting part was that both transistors had been replaced with what appear to
be Motorola devices. They are labeled exactly as follows:

M151
0188

Haven't tried to source or cross them. Since they work in the 3A6 they might
do fine in the 547, also.
Would like to be copied on any follow-ups.
Bernd Schroder

Hello all. Are there any known problems with using a 535A in
vertical position, i.e. with the fan at the rear looking down and
the front panel looking up ?

Other than cooling (ie ensuring that the fan intake is not obscured), and
ensuring that the fan does not do a good job of vacuum cleaning the floor
and depositing it in the scope, I can think of no reason why not.

Craig

Hello all. Are there any known problems with using a 535A in
vertical position, i.e. with the fan at the rear looking down and
the front panel looking up ?

--
Andr??? Majorel <URL:>
Do not use this account for regular correspondence.
See the URL above for contact information.

Hello David,

I'm fairly sure that all the original TDS520/540/620/640/820 series do
not have battery backed real-time clocks. The time is kept in
non-volatile memory but not updated while powered down. You need to
set the time each time you power up. (I know, I have to do this on my
TDS820).

The TDS500/600/700 A,B,C and D series had battery backed RTCs.

Another issue is that the internal batteries in the non-volatile
components are eventually going to fail. They are supposed to have a
life of around 10+ years, however I think a lot of these are now well
over this. Do you know what the date code is on the DS1245Y-120?

As for the piezo beeper, I'm not sure, however it is on the front
panel PCB which you haven't done yet...


Regards,
Stephen.

--- In TekScopes@..., David Woodhead <david_woodhead@...>
wrote:

Hi all,

I just finished replacing all the electroytic caps on CPU and

Acquisitions boards in my TDS540 (did not do front panel yet). I also
replaced a couple of TL074's that had a bunch of electrolyte
underneath them.

It now powers up and reliably passes the power on self test. I ran

the I/O cal routine and it calibrated without issue as well. In fact I
have checked everything I can think of and it all appears to be
working very well except.....

The beeper stays on continually. Also, the clock is not working

correctly. I can set and it runs fine but when I power down and power
up again (a few minutes later) it appears that the clock did not
continue to run when powered down. It does not default to year ~2002
(build date) - it remembers the time when powered down and picks up
where it left off when powered up again! When I press diplay time it
tells me that the clock is not updating when powered downand to run
the setup utility to set the time.

The scope is remembering time and appears to be storing calibration

values ok (when powered down). But the clock does not continue to run
when powered down and the beeper is stuck on.

Any ideas?

Thanks!
David.






[Non-text portions of this message have been removed]

Hello,

Of the two choices, the 7904 would be better for most work. If rack mount is required, then it going to be a R7xxx, with three slots.

The 7xxx mainframe choice depends more on what one is planning to work on with the scope. The later 7904A has a number of improvements that are worth considering (improved power supply, nicer packaging, various circuit updates and etc.). I have used 7904's for years and still to this day,they are one of my favorites. They the basic "work horse" 7K mainframe.

Two other very interesting 7K main frames would be the 7844 dual beam which is basically two 7904s in one package or the 7104, micro channel plate CRT with 1Ghz bandwidth using the proper plug ins. I currently use a 7104 at work for specialty analog/digital design work and what that MCP offers is very high real time writing speed.

Bernice

~~~~~~~~~~~~~~~~~~~~
I'm looking for a new toy and am thinking about a 7904 or R7903.

There is a lot of material in the archives but I would still like

to get some ideas from the group as if this is a good choice

or if there are better choices in the 7XXX family.

Thanks for your input,

Bert

Hello again,

I think I goofed yesterday and replied to the moderator instead of the
list. I just wanted to clarify the trade offer. The 7S12 is just the
7S12, no plugins. Also, the knob for turning the distance tape scale
is not 100%. It has a flip out handle for turning the knob, but the
actual handle is gone. It functions like an ordinary knob though.

Also, I have a line on a 7D15 for a decent price. I'm still looking
for sampling heads and pulse generator heads.

Thanks,
Bob

Hi all,

I just finished replacing all the electroytic caps on CPU and Acquisitions boards in my TDS540 (did not do front panel yet). I also replaced a couple of TL074's that had a bunch of electrolyte underneath them.

It now powers up and reliably passes the power on self test. I ran the I/O cal routine and it calibrated without issue as well. In fact I have checked everything I can think of and it all appears to be working very well except.....

The beeper stays on continually. Also, the clock is not working correctly. I can set and it runs fine but when I power down and power up again (a few minutes later) it appears that the clock did not continue to run when powered down. It does not default to year ~2002 (build date) - it remembers the time when powered down and picks up where it left off when powered up again! When I press diplay time it tells me that the clock is not updating when powered downand to run the setup utility to set the time.

The scope is remembering time and appears to be storing calibration values ok (when powered down). But the clock does not continue to run when powered down and the beeper is stuck on.

Any ideas?

Thanks!
David.

This is normal. The calibrator changes frequency with the Time/Div
setting.

Mitch
N4MF

Hi,
A manual for the Tek 465M has been posted on: ,
courtesy of Mr Stan Griffith (W7NI) and the manual site owner.
This manual includes schematics and is divided into chapters
(sections in the original TEK manual).

Thank You
Kiss-Electronics
Ms Ashley Hall
Cornelius, Oregon
W7DUZ

I have a 2465A, when I connect a prob to the built in calibrator, the
timebase and volts/div only have slight effect on waveform by
switching through the various settings, as I increase the timebase
frequency, it just starts to distort the waveform instead of
stretching out the wave. The scope responds ok to a signal generator
just fine, timebase and volts/div operate as expected.

For the benefit of the list archive: I checked the bezels
on my 310A and 360 and found that they are slightly
different, but they are mechanically interchangeable.
The 360 bezel is a bit more solid and has a boxy look
compared to the rounded corners on the 310A bezel.
-kurt

Gentlemen,

I have a user's manual for the CSA803 Communications
Signal Analyzer. If anybody wants this, they can
have it. -kurt

I'm looking for a new toy and am thinking about a 7904 or R7903.

My 7904 is my general scope of choice. In fact it gets used most (currently housing a 7L5 and tracking gen), with a 475/DM44 as an easily luggable alternative when needed.

Unless you need rack mounting, steer clear of the R7903 - it only has three bays as opposed to 4.

Craig

I'm looking for a new toy and am thinking about a 7904 or R7903.
There is a lot of material in the archives but I would still like
to get some ideas from the group as if this is a good choice
or if there are better choices in the 7XXX family.
Thanks for your input,
Bert

-

From: deadeye283 <terrym80@...>
Subject: [TekScopes] Tek 475 repair/restore questions
To: TekScopes@...
Date: Friday, October 3, 2008, 5:38 PM


Hello to everyone. I'm a new member needing some advice on where to
start with a 475 o'scope that doesn't display a trace signal and when I
use the beam finder I can locate a stationary dot for both channels.

I do have a copy of the service manual for this scope as well as a copy
of the troubleshooting guide for these Tektronix scopes. Any pointers
or advice would be greatly appreciated. Thanks!

Before tearing into everything, I would start out by putting the
scope into X / Y mode, ( make certain that the intensity is turned down),
and checking that the spot can be positioned all over the screen.
Then use the probe adjust signal to verify that a H & V line can be
optained and that the lines and be positioned properly and that the
volts/dev switches are OK..
The manual will show you how to setup X / Y operation.
I have never owned a 475 but I have had lots of experience with
the 465 & 465B and these are well known for sweep problems caused by
the tunnel diodes.
RTFM on everything connected to both A & B triggering.
You may be able to find some combination that will trick the scope
into triggering a sweep, I know that I usually could even with bad TDs.

LOL
Bert

weinerhi wrote:

HELP!!
The sliding plastic dust cover on the rear of the Tek 496P was
difficult to slide, so I sprayed some silicone spray to lubricate it.
While the spray freed up the cover, I noticed that it had become
clouded. Checking the can of silicone spray (CRC Heavy Duty Silicone),
I noticed that it contained ACETONE!!
It's incredible that a product to be used on "nylon, rubber, metal &
non-metal surfaces" (as stated on the front of the can)would contain
this harmful chemical.
I have used silicone spray for years on just about everything and the
silicone spray can in my garage (different brand) contained no acetone.
Having learned a painful lesson (ALWAYS READ THE LABEL), I'm glad I
didn't spray it on anything on the front panel!! Does anyone know
where I can obtain a replacement for this part? I can't find a
reference number for it in the Service Manual. Is there a better name
for it than "dust cover"?
Is it possible (feasible) to polish it off?

If you just need it shiny, you can polish it with Brasso metal polish (it
has fine abrasive), or even with car paint cutting compound first.

Howdy-

Does anyone have a spare CRT bezel that fits
on the TEK 310 - 316 - 317 - 360 'scopes?

I believe the above four TEK scopes all use the same
CRT bezel.

The "3" series all use a 3" CRT.

Any help greatly appreciated.

Thanks!

Vollumscope.

There are lens polishing kits in automotive stores for headlines lens. If the plastic is compatible, it might work
?
Bob