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Re: O.T. Digital scopes versus Tek analogue.

 

I figured that I would not even try to repair it when it fails. I would just replace it. I am 78 years old. I am not particularly worried about whether these Siglent scopes are running in 40 or 50 years. :-)


Re: Very Inexpensive 7623A, but Problems

 

I have added 19 photos to the "Sick 7623A" album showing the current symptoms and the "check-in" photos I took before doing any work on the instrument.

/g/TekScopes/album?id=260677


Re: 547 HV Transformer: Bill Schell rewind failed

 

I powered the 547 for 30 minutes and everything was normal for that time. Then I turned it off.


Re: Tek TLA700 software images. Suitable place to submit them to?

Sandra Carroll
 

The Boot Hard drive was bad

-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Gary Robert Bosworth
Sent: Wednesday, March 3, 2021 8:10 PM
To: [email protected]
Subject: Re: [TekScopes] Tek TLA700 software images. Suitable place to submit them to?

What is a Primary HD?


On Wed, Mar 3, 2021, 15:22 Sandra Carroll <smgvbest@...> wrote:

I¡¯ve just been repairing a TLA714 and the primary HD was bad. So this
is something I¡¯d be interested in

Sandra

Sent from my iPhone 7 Plus

On Mar 3, 2021, at 4:45 PM, ulf_r_k via groups.io <ulf_r_k=
[email protected]> wrote:

?Dear Forum,

I have an old Tek TLA700 Logic Analyzer complete with software disks:
Application V 3.2 - 063-3022-04 ( 2 x CDRom ) Controller BIOS
1.00.14 for TLA704/711 - 063-2895-02 (1.44 Floppy)
W98 Boot Floppy - 063-3418-00 (1.44 Floppy)

If there is any interst in this, I'd be happy to zip them and submit
the files but where?

(I know there is a Logic Analyzer group but very few posts there)

Cheers

Ulf Kylenfall
SM6GXV










Re: Tek TLA700 software images. Suitable place to submit them to?

 

What is a Primary HD?

On Wed, Mar 3, 2021, 15:22 Sandra Carroll <smgvbest@...> wrote:

I¡¯ve just been repairing a TLA714 and the primary HD was bad. So this is
something I¡¯d be interested in

Sandra

Sent from my iPhone 7 Plus

On Mar 3, 2021, at 4:45 PM, ulf_r_k via groups.io <ulf_r_k=
[email protected]> wrote:

?Dear Forum,

I have an old Tek TLA700 Logic Analyzer complete with software disks:
Application V 3.2 - 063-3022-04 ( 2 x CDRom )
Controller BIOS 1.00.14 for TLA704/711 - 063-2895-02 (1.44 Floppy)
W98 Boot Floppy - 063-3418-00 (1.44 Floppy)

If there is any interst in this, I'd be happy to zip them
and submit the files but where?

(I know there is a Logic Analyzer group but very few posts there)

Cheers

Ulf Kylenfall
SM6GXV










Re: International Orders for Peter Keller's book were MAILED TODAY

 

Welcome Paul,

If it's a "Bible" that you want you might also want to check out
'Encyclopedia of the Cathode Ray Oscilloscopes and Their Uses' by John F
Rider, 1955. At 998 pages it's big enough to be a Bible! Peter's book is
*great* but it's pretty much entirely devoted just to the CRT and it's
development but the oscilloscope book covers oscilloscopes and not just
CRTs. There are some amazing historical details in it.

BTW you're lucky. *All* of the libraries in my area have quite using
the inter-library loan service because of the costs.

The Dash.

On Wed, Mar 3, 2021 at 11:01 AM Paul Humel <humel@...> wrote:

I'm a newbie who joined this group recently and discovered the overwhelming
interest in Peter Keller's book. I'm curious about what appears to be the
"bible" of CRTs, but I missed the boat on ordering.



So I logged on to my local public library branch and was able to request a
copy from the UC San Diego Library. I suggest that if others would like to
"try before you buy" you might consider heading to your local library to
see
if they can find a copy for you.



Paul Humel







Re: Sampling head extender missing coax connectors

 

That's good, I still don't understand the mindset of the person cutting the coax.


Re: Tek TLA700 software images. Suitable place to submit them to?

Sandra Carroll
 

I¡¯ve just been repairing a TLA714 and the primary HD was bad. So this is something I¡¯d be interested in

Sandra

Sent from my iPhone 7 Plus

On Mar 3, 2021, at 4:45 PM, ulf_r_k via groups.io <ulf_r_k@...> wrote:

?Dear Forum,

I have an old Tek TLA700 Logic Analyzer complete with software disks:
Application V 3.2 - 063-3022-04 ( 2 x CDRom )
Controller BIOS 1.00.14 for TLA704/711 - 063-2895-02 (1.44 Floppy)
W98 Boot Floppy - 063-3418-00 (1.44 Floppy)

If there is any interst in this, I'd be happy to zip them
and submit the files but where?

(I know there is a Logic Analyzer group but very few posts there)

Cheers

Ulf Kylenfall
SM6GXV






Re: PCB sockets for plug-in xtors/etc.

 

Here are three sources for Advanced:







Vince.

On 03/03/2021 04:51 PM, Jeff Dutky wrote:
Dennis Tillman wrote:

40 years ago I worked for a company that used pins similar to the ones Tek used.
They were filled with a similar material. They came on a flexible 1/4" mylar ribbon
for automatic insertion into a PCB.
I have seen something similar on GRiD laptops from the early to mid-80s, used for extra low-profile socket mountings on the CPU and FPU, for example. The original strips had a seal or gasket just like the Tek sockets. I was unable to find modern equivalents with the seal/gasket. I ended up ordering several strips of Advanced Interconnections Peel-A-Way sockets, but my sources for those have subsequently dried up.

-- Jeff Dutky



--
K8ZW


Re: 547 HV Transformer: Bill Schell rewind failed

 

On Wed, Mar 3, 2021 at 01:19 PM, snapdiode wrote:


my 547 was working fine yesterday, but it didn't run for more than 30 minutes.
It didn't run for more than 30 minutes, and then failed ... or you didn't run it for more than 30 minutes? .... and then you turned it off. (In which case the working state is unknown.)


Re: WSTRO, WSTROU, WSTRM WaveStar Software for Scopes & Meters

 

Mine worked perfect.

Gary


On Wed, Mar 3, 2021 at 10:19 AM Dennis Tillman W7pF <dennis@...>
wrote:

Sometime ago I bought a sealed copy of this Tek software:
WSTRO & WSTRU WaveStar Software for Oscilloscopes, WSTRM WaveStar Software
for Meters.
The label on the back says v2.4 Tek part number 020-2354-00
I can tell from the shape of the package that there is a CD case in it.
The package also has a spiral bound User Manual (071-0220-05) and these
accessories:
A cable with a DB-9 female on one end and a pair of clear LEDs(?) on the
other end where it says it is an Optical Interface Cable .
A DB-9 male to DB-25 female Adapter
Five DB-9 shaped black plastic bezels

Has anyone had any experience using this WaveStar software?

Dennis Tillman W7pF





--
Gary Robert Bosworth
grbosworth@...
Tel: 310-317-2247


Re: PCB sockets for plug-in xtors/etc.

 

Dennis Tillman wrote:

I always wondered what the Tek PCB sockets were filled with and was that stuff really necessary?
I'm only guessing that it's silicone. I've not gotten a great look at it, actually. I thought, in the GRiD laptops, that it was a solid seal over the top of the socket, based on first encountering it in the sockets for an unpopulated 8087, but that may also be inaccurate.

-- Jeff Dutky


Re: Very Inexpensive 7623A, but Problems

 

One thing that I've noticed on Tek equipment, is that the pin one indication is a triangle pointing to the pin.? The cable connectors are similarly labeled.? I liked it so much that it's what I use on my PC boards.

I've also seen the pc land for pin 1 set to a square rather than a circle.

Harvey

On 3/3/2021 4:21 PM, Jeff Dutky wrote:
Jean-Paul,

I will post photos shortly to the "Sick 2365A" album (/g/TekScopes/photos?p=created,,,20,2,20,0&jump=1)

I have the service manuals from TekWiki, which purport to be from 1974, have not effective or discontinued serial number ranges in the part lists, but do have two MCI pages (also from 1974).

Yes, I have come to the same conclusion as you about scopes, especially the large, non-portable sort, on eBay. Out of three such scopes I have bought, one was a complete loss, with the CRT shattered in shipping (thankfully I got a refund and return shipping label on that), and the other two are yet to be determined. The prices for all three, however, were right (each less than $100, shipping included), so it's hard (not impossible) to go too far wrong.

The reason I bought this scope was to expand my technical skills by fixing it (and just to have a 7000 mainframe scope, and a storage scope), so it's money and time well spent. If I were just trying to get a working scope to use for other things, then this would be a real waste. Aside from being a storage scope, the 7623A is inferior every portable scope that I already own. All of those scopes are working (and various kinds of rough handling, either in shipping, or by the original owners), and are my preferred bench scopes. This is really just a toy, at least until or unless I get a nice plug-in (e.g. a 7CT1N or one of the spectrum analyzer plug-ins).

Roger,

It's always good to be reminded of what I allegedly know (but may not, in the moment, recall). I had read about the color coding, but I'm not sure it helps much in this instance. My real concern was both getting the cables connected in the right places and orientations, and getting all the cables connected again.

I did notice that the case of the C811 seemed to bridge two "ground planes," and I added a jumper wire to do the same. I'm not sure it's of adequate current rating: it's single strand copper AWG 22 or 24, the spool is unmarked, but it's heavier than the AWG 26 that I normally use for breadboarding. I could easily add a second or third jumper if necessary.

It has occurred to me, after looking at the picture of the original CRT malfunction, and thinking about what would cause the current malfunction, that one of the horizontal deflection plates might be loose or disconnected, and that now both may be loose, or otherwise malfunctioning. After I get the power rails sorted this may be my second avenue of investigation.

-- Jeff Dutky





Re: PCB sockets for plug-in xtors/etc.

 

The ones spec'd in the B25+ 465 manual are Berg 75060, which appear to be deceased. But like Mill-Max, it's a starting point.
-ls-


Re: PCB sockets for plug-in xtors/etc.

 

Sorry, Dennis, wrong question before. what is the spacing of the three pins and are the spacing angles 120¡ã? Or, what pattern?

The datasheet at DigiKey does not come up.

Larry

On 3/3/2021 11:02 AM, Dennis Tillman W7pF wrote:
Hi Dave,
These are the ones I use with their corresponding DIgiKey and Mouser part numbers:
Mill-Max Part Numbers
917-93-103-41-005000 CONN TRANSIST TO-5 3POS GOLD
0552-2-15-01-11-27-10-0 CONN PIN RCPT .015-.020 SOLDER
0552-2-15-15-11-27-10-0 CONN PIN RCPT .015-.020 SOLDER
All three of these are still available from DigiKey.
Mouser Part Numbers
575-055220 Mill-Max 0.015-.022¡± pin, 0.170¡± deep, for small transistors & small in-line pkgs.
575-0293015 Mill-Max 0.022-.034¡± pin, 0.170¡± deep, for TO-66 transistors
575-031400 Mill-Max 0.032-.046¡± pin, 0.236¡± deep, for TO-3 transistors & large in-line pkgs.
Only two are available now from Mouser.
Dennis Tillman W7pF
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Dave Peterson via groups.io
Sent: Wednesday, March 03, 2021 10:34 AM
To: [email protected]
Subject: [TekScopes] PCB sockets for plug-in xtors/etc.
Is there a resource for the sockets that are soldered into the PCB boards in scopes with plug-in transistors, ICs, diodes, etc.?
Dave
--
Best wishes,

Larry McDavid W6FUB
Anaheim, California (SE of Los Angeles, near Disneyland)


Re: TDS3064B "ripple" on calibrator signal

 

Unfortunately that isn't the problem ? Also tried other probes.

D.

-----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Dave Peterson via groups.io
Sent: 03 March 2021 16:08
To: [email protected]
Subject: Re: [TekScopes] TDS3064B "ripple" on calibrator signal

David,

In my limited experience, I have seen this behavior before, but it's always been due to probe issues.


Re: PCB sockets for plug-in xtors/etc.

 

Dennis Tillman wrote:

40 years ago I worked for a company that used pins similar to the ones Tek used.
They were filled with a similar material. They came on a flexible 1/4" mylar ribbon
for automatic insertion into a PCB.
I have seen something similar on GRiD laptops from the early to mid-80s, used for extra low-profile socket mountings on the CPU and FPU, for example. The original strips had a seal or gasket just like the Tek sockets. I was unable to find modern equivalents with the seal/gasket. I ended up ordering several strips of Advanced Interconnections Peel-A-Way sockets, but my sources for those have subsequently dried up.

-- Jeff Dutky


Tek TLA700 software images. Suitable place to submit them to?

 

Dear Forum,

I have an old Tek TLA700 Logic Analyzer complete with software disks:
Application V 3.2 - 063-3022-04 ( 2 x CDRom )
Controller BIOS 1.00.14 for TLA704/711 - 063-2895-02 (1.44 Floppy)
W98 Boot Floppy - 063-3418-00 (1.44 Floppy)

If there is any interst in this, I'd be happy to zip them
and submit the files but where?

(I know there is a Logic Analyzer group but very few posts there)

Cheers

Ulf Kylenfall
SM6GXV


Re: PCB sockets for plug-in xtors/etc.

 

Dennis, do you know the appropriate finish hole size in the PWB for each of these replacement sockets?

Larry

On 3/3/2021 11:02 AM, Dennis Tillman W7pF wrote:
Hi Dave,
These are the ones I use with their corresponding DIgiKey and Mouser part numbers:
Mill-Max Part Numbers
917-93-103-41-005000 CONN TRANSIST TO-5 3POS GOLD
0552-2-15-01-11-27-10-0 CONN PIN RCPT .015-.020 SOLDER
0552-2-15-15-11-27-10-0 CONN PIN RCPT .015-.020 SOLDER
All three of these are still available from DigiKey.
Mouser Part Numbers
575-055220 Mill-Max 0.015-.022¡± pin, 0.170¡± deep, for small transistors & small in-line pkgs.
575-0293015 Mill-Max 0.022-.034¡± pin, 0.170¡± deep, for TO-66 transistors
575-031400 Mill-Max 0.032-.046¡± pin, 0.236¡± deep, for TO-3 transistors & large in-line pkgs.
Only two are available now from Mouser.
Dennis Tillman W7pF
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Dave Peterson via groups.io
Sent: Wednesday, March 03, 2021 10:34 AM
To: [email protected]
Subject: [TekScopes] PCB sockets for plug-in xtors/etc.
Is there a resource for the sockets that are soldered into the PCB boards in scopes with plug-in transistors, ICs, diodes, etc.?
Dave
--
Best wishes,

Larry McDavid W6FUB
Anaheim, California (SE of Los Angeles, near Disneyland)


Re: Tektronix 606A that resists being repaired

 

Q714 is currently a Tektronix transistor marked 151-0606-00 referenced as Motorola SJE375 but I can't find any info on this device. The transistor that used to be there (broken) has no identification at all. I tried several MJE800 Darlingtons as listed in the manual but they fail because of rush-in current at startup. Can I add a small power resistor at the collector of Q714 to prevent this? Under normal operation, the current through Q714 seems to be about 1Amp (see below) so the MJE800 should work (4Amp rating)

If I set the cathode voltage at about -5000V (or a more positive value, max -4700), the device works find and oscillation doesn't stop anymore. The voltage drop across R714 in this mode is 1V or less (so 1 Amp current) and stays there. At -5000V, the image is clear but intensity control is limited. At -5500V, the specified value, the oscillation circuit eventually stops, after almost 30 minutes.

Still using 1R for R715 because my experiments show that a higher value here increases the oscillator run-time (limits current flow through Q714 is my guess, thus postponing the thermal runaway). Once I install the faster diodes (UF4004), I'll try to original 0.5 Ohm R715 again.

You say "The output will be shifted up if there is 1-ohm". I assume you are referring to U740 pin 6. Even at a limited cathode voltage of -5000V, the voltage here starts at 2V (with 1 Ohm R715).

Note that the screen image is crystal clear with -5000V cathode voltage but I would like to completely fix this device.

Should have more results in about a week.

JdR