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Hi all

Just because I'm curious, I'm trying to put together a list of the tunnel
and sampling diodes that Tek used in what instrument, and as far as possible
what their specifications are. I'm making reasonable progress, but I'm
missing details of what is in a number of instruments that clearly use them.
The ones that I have already done are:

1S1, 1S2, 7T11, 3T2, 3T6, 3T77, 485, 7B92A (early), 434, 435, 456, 464B,
475A, 184, 555, 547, 556, 453, 544, 454,

And the ones that I have identified that I *don't* have are:
5T1, 3T3. (but there may be more)

Also, Stan has identified a whole list of others that use a 4.7mA diode
(152-0125-00) he supplies:
1L40, 11B1, 11B2, 11B2A, 147A, 1470, 148, 21A (new style 555 Timebase), 22A,
408, 432, 453A, 466, 491, 5T3, 546, 7B70, 7B71, 7D11
but these probably include tunnel diodes in addition to 152-0125-00.

The other thing I'm trying to do is put together a list of sampling and snap
off (or step recovery) diodes that are used. I've done the following:
1S1, 1S2, 3S1, 3S76, S1, S2, S3/S3A, S4, S5, S6, 7S14

The ones that I know are missing are:
4S1, 4S2, 4S3, 3S5, 3S7 (again, there may be more).

Practically, what I hope to get out of this is (a) a cross reference of what
TD's are used in what instrument, so that a rare instrument can be
resurrected by use of a more common donor and (b) practical suggestions
about what diodes can be used if a sampling bridge or snap-off diode is
zapped.

So if anyone out there has some of the manuals that contain the data needed,
I'd really appreciate you having a poke around and sending me the data.
Once complete, I'll either post it to our yahoo site, or my own (or both).

Cheers

Craig

A few weeks ago I posted a message looking for anyone interested in
three Tek 547's that I had. I have found "good" homes for two of
these and the third unit has been a sucessful part source. If anyone
is interested in parts from this unit I could ship them to you for a
fair price plus shipping. This unit does not have any of the socketed
tubes or transistors remaining, so what's left is either items that
are soldered in place, the CRT, or mechanical components. This unit
powered up and created a trace on one of the timebases.

Thanks again for all the help in searching for parts for my 464
scope. I haven't found a service manual yet and some replacement
knobs, but I found some good contacts!

Dan Szubra

Gentlemen-

I scored a nice, clean P6046 at a ham swap yesterday that works perfectly however, no accessories were included. Does anyone have replacement probe tips or the X10 attenuator that goes with this probe? I would really like to complete the package and the attenuator provides some needed protection for the probe input. Thanks in advance for your response,

Phil.

Hi, gang,

With thanks (again) to Fred de Vries, the following additional file(s) are now available on the Blue Feather FTP archive at ftp.bluefeathertech.com.

File name: 2465CTS.zip

Path: /pub/electronics/testgear/Tektronix/firmware

Version: Unknown

As always, please keep the following restrictions in mind when accessing the archive: (1), There is a five-user limit for anonymous logins at any one time. (2), Download speed is capped at 128Kbps.

Both of these limits are designed to maximize availability of the archive for all, taking into account the limits of my DSL pipe. Regrettably, I cannot yet afford a T1 or F-T1 line.

Access to the archive is best made with a real FTP client program as opposed to a web browser. This is because transfers made through a web browser are often slower, due to translation between the HTTP and FTP protocols. There are plenty of freeware and low-cost shareware FTP clients available. My personal favorite is WS_FTP, by IPSwitch Software, widely available from download sites all over the planet (including Tucows.com and ftpplanet.com).

When logging in, be sure to specify 'anonymous' (spelled out, no quotes) as your user ID. Your E-mail address is preferred as the password, but it is not a requirement (really, just about anything that contains printable ASCII characters will work).

CONTRIBUTIONS: Further contributions to the archive are always welcome, subject to the following conditions.

(1) Whatever you submit must be firmware or software that is NO LONGER SUPPORTED OR SOLD by Tektronix, or it must be directly related to equipment that is no longer supported or sold. Firmware or software relating to CURRENT Tektronix equipment WILL NOT be posted for download unless Tektronix makes the same file(s) publicly available from their own site.

(2) Contributions should be sent via E-mail attachment to 'kyrrin at bluefeathertech dot com,' and should be archived with any of the common compression utilities, such as Power Archiver, WinZip, Gzip, etc.

(3) The preferred format for EPROM or EEPROM image files is Absolute Binary (Data I/O #16). This helps to guarantee compatibility with the widest possible range of device programmers. HOWEVER -- Other formats, such as Intel Hex or Motorola S-record, may be submitted with a note indicating the format used.

(4) The preferred format for PAL or PLD image files is a standard JEDEC fuse map.

Thanks to all for your contributions and interest.


-=-=-=-=-=-=-=-=-=-=-=-
Bruce Lane, Owner & Head Hardware Heavy,
Blue Feather Technologies --
kyrrin (at) bluefeathertech do/t c=o=m
"If Salvador Dali had owned a computer, would it have been equipped with surreal ports?"

Hi all, Does anyone know of a source for replacement front plastic
panels for the single bay plug ins? I'm sure you have seen em with
the bronken or cracked corners. Thanks ahead! Chris

Looks like scans of the 110, 132, 145, 154, and the glorious 166 function
generator docs.

Pop up a directory if you have any interest in historic computing...it's
quite an archive of scans!


newell

I am getting the insane info that #7329 is the last post on this
group, and I don't know whom to contact about this.

Any ideas will be mightily appreciated! Thanks in advance,

Jonathan Vanderwall

Darrin,

I find a lot of bad power cords in the older scopes (453s) due to
age and maybe some abuse - pulling plug out by the cord, sharp
bends, etc.

Use an ohm meter to check continuity of the cord from the blades in
the plug (switch on/off). Should be probably about 5 to 10 ohms
(judging from older scopes.) Wiggle the cord around the plug and
along its length, watching for the ohm meter to jump around.

And, while you are at it, check the continuity of the grounding wire
from plug to chassis. That is the first to go. More than half the
453 and 454 scopes I've checked had an open or intermittant ground.

Check for loose fuses, or fuses with corroded terminals.

Since the LED probably runs off one of the DC supplies, that would
be the next thing to check. I don't have a schematic for the 465,
so I cannot help there. Check if all low power supplies go off at
the same time. (Hopefully someone can give you specific test
points.)

Good luck,
-Howard

--- In TekScopes@..., Darrin Conniff <djconniff@s...>
wrote:

Grettings All!
I have a 465M that just cannot decide whether it wants to be on or

off. It powers up fine (with a crispy trace!), then the power LED
blinks with no kind of timing at all. As this is happening, the
trace restarts from the left.

I don't have the manual for this model yet. Any and all

suggestions will be welcome.

Thanks in advance.
Darrin

Hi Peter
The DSA circuits were never published (like 99% of the TDS scopes and most
products built in the last 10 years.)
The failure is in the mainframe (plug in none - means no failures for the
plug ins).
The manual suggests any of the following modules could be at fault.
Sweep Controller U530 on Upper Acquisition board (A7) or Calibrator board
(A5).
These are not available from Tek and most of the critical IC/hybrids are Tek
custom parts.

I think the only effect would be to the timebase accuracy or the skew
between channels (identical edges may not line up exactly between channels).
You are right about the scope - this is the peak of Teks brilliance in
building the best scopes.
Huge range of capabilities and the most accurate scope they have ever made.
We love ours and it's the primary "Standard" scope for us.
We have a full set of 11A72's x 3, 11A33, 11A34, 11A32, the rigid extender,
flexible extender and 3 x 7K standardisers modified for 11K use
067-0587-10's instead of -02"s.

It's a lab scope with no compromises and was a worthy successor to the best
7K scopes - pity that customers never took to it like the 7K - in the end
that was the downfall of the whole 11K,DSA,CSA range.
Regards
Denis Cobley
www.newteksupport.com

I have been testing my DSA 602 ( 6 of 12 channels, 4 x 400 Mhz, 2 x 1 Ghz ) with Option C04 ( > 1 MBy total non volatile RAM ) for a few days now.
This beast is really the most stunning scope I ever saw.
This is no scope, this is measurement laboratory :-)

Up to now I only use the Tutorial and the User Ref.
I still consider where to order the Service Ref + Schematics , Command Ref and Programmers Ref.
I asked Dave DiGiacomo for his price quotation.
I guess this is a good move ?

Lacking the Service Manuals as yet, I wonder what is the consequence of this error :

" partial enhanced accuracy failed , main pulse width ; plugin none ".

Is the meaning of this only that the ( enhanced ) accuracy ( btw which accuracies ? ) is decreased until 3% vertical instead of the enhanced > 1% vertical or is this error prompt more threatening than that ?

I did many tens of tests ( all triggering functions, amplitude, FFT freq and FFT phase, power, all waveform functions, storing/recalling, scanning the memory etc. etc. and all tests seem to succeed.

I just can't judge accurately the accuracy of the measurent function.
I use 12 other scopes and spectrum analyzers but no one can be a reference for my DSA 602

How far does the failing enhanced calibrating accuracy selftest disqualify the measurement and other displayed results ?
Does the enhanced accuracy test require a probe connected to the input connectors ? ( I have no active TEK probes as yet ).

Where in the schematics ( after I got them ) should I search for the failing " main pulse width " ?
Any suggestion where and what to check, repair or replace ( if not a *&^% TEK custom part ) ?
Has someone DSA 602 parts available or a complete defective 602 ?

Thanks for response.

Peter van Daalen.

Grettings All!
I have a 465M that just cannot decide whether it wants to be on or off. It powers up fine (with a crispy trace!), then the power LED blinks with no kind of timing at all. As this is happening, the trace restarts from the left.
I don't have the manual for this model yet. Any and all suggestions will be welcome.
Thanks in advance.
Darrin

Tektronics CRT V300 Pn: 154-0642-00

Any suggestions with testing the CRT? The problem that I can see is a circuit by the name of the " Grid Bias Circuit". It supplies
the voltage to the CRT grid and is acting very erratically. One minute it has voltage and the next, the voltage bleeds down to 0V.

Is there someone here that can help me with a 7L12 that has suddenly lost sensitivity by about 50 dB? The problem seemed erratic
at first. A couple times when I first turned it on it worked OKat first then lost sensitivityafter a few minutes. At least one of these
times it was really intermittant for a minute or two before going out - I could wiggle the input connector and make the signal level jump
up and down. Now the problem is perminant no matter what, I have examined the connectors and cables inside the unit but can find
nothing that causes the intermittant. I don't think the first mixer was blown, I am very careful about that and was looking at a source I
often look at when the 7L12 first died.

Any help?

Mike in Indy

Working on a DM5010 multimeter it has a bunch of little square button
switches on the front panel, a few are sticky, should I try and clean
them or lubricate them ? And how with what ? I have it completely
apart they don't apear dirty, they are plastic, I beleive the same are
used on some later scopes. Thanks in advance for any wisdom on this
subject, Jon P.

Gentlemen-

I've acquired an AM503 and am looking for a compatible current probe (DC to 5+MHZ) to use with it. Is anyone aware of a listing of probes or have a recommendation of acceptable models? Thanks in advance for your input.

Phil

Gentlemen-

Is this really an all-male list? Bummer.

I've acquired an AM503 and am looking for a compatible current probe (DC
to 5+MHZ) to use with it. Is anyone aware of a listing of probes or have a
recommendation of acceptable models? Thanks in advance for your input.

Excerpt from my list @ :

Tektronix A6302 DC current probe 50MHz 20A
Tektronix A6302XL DC current probe 17MHz 20A
Tektronix A6303 DC current probe 15MHz 100A
Tektronix A6303XL DC current probe 10MHz 100A
Tektronix A6304XL DC current probe 2MHz 500A
Tektronix A6312 DC current probe 100MHz 20A

I think the XL models may require an AM503B/AM5030 amp, but I'm not sure.

David DiGiacomo
San Francisco, CA

Hi all!

1/2 drop of lubricant on the shaft instantly solved the problem. Pot turns perfectly now --like new. Thanks to each of you who suggested less drastic measures than replacement.

Steve

I would like to inquire if anyone in this fine group of ours has a CRT for
a Tek 2235, or 2236 for sell, or trade.
The part number on the CRT is 154-0861-00.

----------

Darrin
If you don't manage to find a 0861 CRT then in most cases you can use a
0731 tube from a 465/465B/468 which is more likely to be available. However
there are a couple of caveats -

-The 0731 does not have integrally mounted trace rotation coils so the ones
from the old CRT must be swapped over.

-Pin 12 on the CRT base must be reading approx 100v, an early 2235 will
have this but the voltage will be missing on later ones. In this case to
successfully use the 0731 you must add 3 components - CR879, R879 and C879.
The mounting holes for these should already be drilled in the pcb (under
the power supply cover) and they should show on the silk screen print so
adding them is easy. Values are R879 510K 5% 0.25w, C879 Ceramic 0.1uF
200v, CR879 is 400v 750mA and has a Tek part number of 152-0413-00, mfr no
shown as UTR307, but I have successfully used 1N4004 in this position.

...Ben

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A renewed search of my Digikey catalog has part number 381N505-ND. ($13.35). This is a Clarostat 1 Watt conductive plastic linear pot with identical mechanicals to the original, which was also a Clarostat part. I was nervous about the 350 Volt rating, but if my calculations are correct, there is about 326 Volts across that pot in circuit, so it should be fine. Comments welcome.


I am in need of a new "focus" pot for my Tektronix 475 scope, serial number B278849. The part Identifier is R1380. The Tek part number is 311-0075-00. Description is: Res., VAR, NONWIR:
5M Ohm 20% It is a small all metal round pot with a 1/4" bushing an an 1/8" shaft. The pot works electrically but is binding/stuck mechanically. It can be rotated, but it is very, very stiff. I'm afraid of breaking the fiberglass extension rod.

Lubricate the shaft where it enters the body of the pot with contact
cleaner. Turn the pot. Repeat
as necessary.
You will probably find it only takes one or two tries to get enough
penetration to fix the problem.
It is nearly 100% certain that this is all it needs to free it up. I
have never run into a case where this kind of mechanical binding
requires component replacement
Arthur Shulman

Steve Hogan wrote:

Hi all!

I am in need of a new "focus" pot for my Tektronix 475 scope, serial
number B278849. The part Identifier is R1380. The Tek part number is
311-0075-00. Description is: Res., VAR, NONWIR:
5M Ohm 20% It is a small all metal round pot with a 1/4" bushing an
an 1/8" shaft. The pot works electrically but is binding/stuck
mechanically. It can be rotated, but it is very, very stiff. I'm
afraid of breaking the fiberglass extension rod.
Tek, of course doesn't have it, and though it is a simple pot with no
special push-pull switching, etc. 5 MegOhm is not that common a value
any more so I have not yet found a quality generic replacement. I
assume that this pot has linear taper.

Thanks for helping.

Steve Hogan
Can someone out there he





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