Date   
Re: Tek 475A transformer replacement

Harvey White
 

If you don't have any spare antennas, and the neighbors' cars don't have any either, then a good hobby shop has brass and aluminum stock, perhaps steel as well, of various fractional inch sizes.

Harvey

On 6/4/2020 12:39 PM, Ed Breya via groups.io wrote:
If you have any junk telescopic antennas around, they are a handy source of assorted hard brass tubing sizes. Look for a section about the right diameter, and cut a piece and file an end square. I've always managed to find a piece the right size for any connector pin removal. It's good to also wind up a handle at the cold end out of many layers of tape, to get enough axial force and torque without gouging your hand.

I also use them to make rotary punches for making holes in thin, soft materials, by putting a cutting edge on the tip - just spin a drill bit (larger than the tube OD) in the end until the outer edge is nice and sharp. To punch a hole just push and twist it through. It can also be chucked in a drill. These wear out fast, so need to be resharpened as needed. They can make nice clean holes, especially in rubbery type materials, much better than a drill bit.

Ed


Re: Tek 475A transformer replacement

Ed Breya
 

If you have any junk telescopic antennas around, they are a handy source of assorted hard brass tubing sizes. Look for a section about the right diameter, and cut a piece and file an end square. I've always managed to find a piece the right size for any connector pin removal. It's good to also wind up a handle at the cold end out of many layers of tape, to get enough axial force and torque without gouging your hand.

I also use them to make rotary punches for making holes in thin, soft materials, by putting a cutting edge on the tip - just spin a drill bit (larger than the tube OD) in the end until the outer edge is nice and sharp. To punch a hole just push and twist it through. It can also be chucked in a drill. These wear out fast, so need to be resharpened as needed. They can make nice clean holes, especially in rubbery type materials, much better than a drill bit.

Ed

Re: Tek 4041 GPIB Controller

Monty McGraw
 

Gary Robert Bosworth and Dave Brown and anyone else interested in a copy of the 4041 System Verification tape,

send me an email: mmcgraw74@...

Monty McGraw

Re: Tek 475A transformer replacement

Chuck Harris
 

It all becomes easier if you first push the wire
in the direction of insertion.

I have successfully made removal tools using tin snips,
a tin can, pliers, and a nail around which to roll the
tin can material.

Form a tube that is the same size as the plastic shell's
opening, insert the tube, at the same time push the wire
towards the tube. When the tube passes the connector's
retaining fingers, pull the wire out of the shell.

-Chuck Harris

aldue wrote:

Hi Jim, I have some pin removal tools that work on various Molex style
connectors. They amount to a thin tube that slides over the pin which
disengages the exterior spurs plus, a piston plunger to eject the pin.
The pin diameter needs to be near the tools size.
I shall send a photo in a few minutes. They require more muscle than you
expect however, they work neatly with a bit of persistence. Wish you
success with the project, Gary

On Thu, Jun 4, 2020, 5:55 AM <jim.hall@...> wrote:

Hello. I am new to this group, but am very interested in the discussions.
As a hobby, I have restored some Tek 465 and 475 scopes. My latest 475A has
a bad low voltage transformer. It plows the main fuse even when all of the

Re: Tek 475A transformer replacement

aldue
 

Hi Jim, I sent photos but, attachments are disallowed. Most are made by
AMP. You may find them at Newark Electronics. The look a bit like a syringe
with a tube instead of a needle.
They punch pins out of plastic blocks. If this is similar to your Tektronix
connector, try to measure the diameter of the holes molded into the
plastic blocks. Send me the data and I shall check for the correct tool.
Ebay has the cheap tool kits but, I haven't been able to make them work.,
aldue = Gary

On Thu, Jun 4, 2020, 5:55 AM <jim.hall@...> wrote:

Hello. I am new to this group, but am very interested in the discussions.
As a hobby, I have restored some Tek 465 and 475 scopes. My latest 475A has
a bad low voltage transformer. It plows the main fuse even when all of the
secondary windings are disconnected. To replace it, I need a pin removal
tool (Tek 003-0707-00), but have been unable to locate one. I would
appreciate any suggestions where I can acquire one. Thanks.



Re: TLA711 Benchtop controller schematic needed

Roy Thistle
 

On Thu, Jun 4, 2020 at 12:53 AM, Egge Siert wrote:


In my experience it is nearly impossible to damage through-hole connections in
Multi-Layer Boards.
Hi Egge, Hi All:
Trust me, with a Mr. Carlson Weller soldering gun special, and a Hexagon 100Wer... people do it to Tek stuff, all the time.
Best regards and wishes.
Roy

Re: Tek 475A transformer replacement

aldue
 

Hi Jim, I have some pin removal tools that work on various Molex style
connectors. They amount to a thin tube that slides over the pin which
disengages the exterior spurs plus, a piston plunger to eject the pin.
The pin diameter needs to be near the tools size.
I shall send a photo in a few minutes. They require more muscle than you
expect however, they work neatly with a bit of persistence. Wish you
success with the project, Gary

On Thu, Jun 4, 2020, 5:55 AM <jim.hall@...> wrote:

Hello. I am new to this group, but am very interested in the discussions.
As a hobby, I have restored some Tek 465 and 475 scopes. My latest 475A has
a bad low voltage transformer. It plows the main fuse even when all of the
secondary windings are disconnected. To replace it, I need a pin removal
tool (Tek 003-0707-00), but have been unable to locate one. I would
appreciate any suggestions where I can acquire one. Thanks.



Tek 475A transformer replacement

jim.hall@...
 

Hello. I am new to this group, but am very interested in the discussions. As a hobby, I have restored some Tek 465 and 475 scopes. My latest 475A has a bad low voltage transformer. It plows the main fuse even when all of the secondary windings are disconnected. To replace it, I need a pin removal tool (Tek 003-0707-00), but have been unable to locate one. I would appreciate any suggestions where I can acquire one. Thanks.

TEK 321A O-Scope Power Cords Wanted

J38AL@...
 

Hi all,

I would like to purchase the power cords for a TEK 321A O-Scope. Both would be nice but just the AC or DC cord will help.
Please let me know if you have something and how much you want including shipping to zip 12302.

Thanks,

Al

Re: TLA711 Benchtop controller schematic needed

Egge Siert
 

Hi Jim.

Some months ago I bought (out of curiosity) a "working" TLA704 with an overdue DS12887 (OS not found). Mouser still has this device and after replacing the old one new settings can be saved and the TLA704 is now working flawlessly. Based on its (DS12887) Diagram and Pin-Out it seems not a hard one to reconstruct the missing traces. In my experience it is nearly impossible to damage through-hole connections in Multi-Layer Boards. I suggest to put back a new DS12887 (this time with DIL-Socket).

https://www.youtube.com/watch?v=daoxD-SS3ZU (for another solution)

Succes,

Egge Siert

Re: Tek 4041 GPIB Controller

Monty McGraw
 

I successfully created a copy of the System Verification tape and tested it on my 4041 without the ROM Carrier and Program Development ROMs installed!

Quite an effort - I received the 15 DC100A NOS tapes Sunday and spent the rest of the day trying to record on one of them - unsuccessfully. The belt was not broken when I took off the shrink wrap - but it broke immediately when I pressed the AUTO LOAD button on the front panel.

I replaced the belt with one of the 4 1/4" Plastibands and tried multiple times to format the tape but kept getting errors. The band kept popping off and the tape head was getting clogged with 'tape shed' and the two guide posts collected 'tape shed' and the tape would stick.

An internet search turned up a youtube video from Curious Marc that itemized several different issues with trying to recover the data from old DC100 tapes in an HP computer - I was seeing most of those issues with these NOS tapes. I believe these five tapes are from 1993, a second box 1992 and the third box from 1991 - based on the publishing date on one of the papers inside the case with each tape.

The solution recommended in the video was to 'bake' the tapes at 135 degrees F in a dehydrator.

I went looking for tape 'baking' instructions, and http://qicreader.blogspot.com/p/tape-baking.html said his best results were from baking for two days.

I opened up the other four tapes, removed the plastic belt rollers, the capstan and taped the two drive reels together as recommended with the tape directly between the two reels.

I have an Excalibur dehydrator and set the control to 135F. I put all five NOS tapes in the dehydrator, numbering each on the 'invisible tape'. I measured the temp of the tapes multiple times during the two days with an infrared temp sensor - got within one degree of 135F every measurement.

Instructions indicated letting the cartridges cool for an hour - I waited longer than that.

First I tried reassembling tape #1 that I was unable to use on Sunday - with a fresh Plastiband belt. The 4041 kept indicating an Invalid Tape error. Possibly from previous recording attempts.

I then put tape #1 aside and picked tape #2, fresh band, plugged it in and got CRC error when I pressed AUTO Load. I was able to format the tape and began writing one file at a time to the tape, checking the directory list after each operation. I had to replace the belt a couple of times, and retension a couple of times, but got all the files written.

Here is the resulting directory list of my first System Verification Tape copy. Notice that I didn't put a tape name in the FORMAT command, and didn't SET TIME until several files were recorded.

My process steps were not quite correct - here is a new sequence, after you have bootstrapped the console to COMM: (COMM0: if you have two serial ports)

1 - SET TIME 2 - Format the tape, recommend adding the parameter to name the tape 3 - Select an ASCII file to SEND with Realterm 4 - Start the transfer - you will see the lines of the program on the Realterm window 5 - Select the Realterm console window in order to type commands to the 4041 6 - SAVE "filename(OPE=NEW,CLI=YES,FOR=ITEM)" 7 - If you don't get an error, type DIR and check that 'filename' is at the end of the DIR and the correct type (IT) and filesize. If error, DELETE FILE "filename" and do STEP 6 8 - LOAD "COMM:" then press front panel "ABORT" button. This clears the previous program in memory. 9 - now repeat starting with STEP 3 until done

Here is my tape copy long directory list. Only file that didn't match length with original is the last file TSCSI.ASC. I actually I wrote both the TDIR and CONFIG files in 2000 - note the file dates are the 4041 default of 1981 if the SET TIME command is not run.

From the timestamps - it took me three hours to write the files to the tape.

       01-JAN-81 00:15:50  SOFT ERRORS = 21       

FILE FILE LENGTH START NUMBER LAST
NAME TYPE IN BYTES RECORD OF REC. MODIFICATION DATE


AUTOLD IT 2550 5 10 01-JAN-81 00:28:00 TERMIN IT 8160 15 32 01-JAN-81 00:40:00 SYSVER IT 3570 47 14 01-JAN-81 00:44:00 CONFIG AS 1020 61 4 01-JAN-81 00:50:00 PROCED IT 1020 65 4 01-JAN-81 00:59:00 LINK IT 765 69 3 01-JAN-81 01:01:00 DISP IT 1275 72 5 03-JUN-20 19:33:00 KEYPAD IT 1530 77 6 03-JUN-20 19:37:00 PRINTE IT 765 83 3 03-JUN-20 19:41:00 TAPE IT 4590 86 18 03-JUN-20 19:43:00 SOFTER IT 765 104 3 03-JUN-20 19:45:00 IO IT 4590 107 18 03-JUN-20 19:48:00 TIMER IT 1530 125 6 03-JUN-20 19:49:00 PDKYBD IT 4335 131 17 03-JUN-20 20:01:00 GPIB IT 2040 148 8 03-JUN-20 20:10:00 GPIBLB IT 3315 156 13 03-JUN-20 20:12:00 GPIBCO IT 2040 169 8 03-JUN-20 20:13:00 SLAVE IT 3315 177 13 03-JUN-20 20:15:00 MASTER IT 1785 190 7 03-JUN-20 20:17:00 PAU IT 765 197 3 03-JUN-20 20:21:00 TPCAL IT 1275 200 5 03-JUN-20 20:23:00 PTRCAL IT 1020 205 4 03-JUN-20 20:25:00 FRMAT IT 1020 209 4 03-JUN-20 20:27:00 TSTPTN IT 2040 213 8 03-JUN-20 20:37:00 CHKOPT IT 1275 221 5 03-JUN-20 20:39:00 OPT2 IT 765 226 3 03-JUN-20 20:56:00 HELP IT 3060 229 12 03-JUN-20 21:00:00 PDTEST IT 255 241 1 03-JUN-20 21:05:00 SCSI IT 2550 242 10 03-JUN-20 21:07:00 TSYSVR AS 4080 252 16 03-JUN-20 21:09:00 TSCSI AS 4590 268 18 03-JUN-20 21:19:00 98685
*

Re: Oscilloscope Sales

Reed Dickinson
 

Greetings fellow trekkies:
I have been informed that my email address, that I included in my note of June 1st, had the email address truncated after the at (the shift 2 symbol).  Please note the following correct address:
reed714(now put in the shift 2 at symbol)sbcglobal(now enter a period)net.  If this does not work please give me a call at 714 838 6241, preferably in the afternoon.

On Wednesday, June 3, 2020, 07:25:25 AM PDT, David DiGiacomo <daviddigiacomo@...> wrote:

On Tue, Jun 2, 2020 at 10:48 PM M Yachad <@yachadm> wrote:

Reed

Please write your email using the AT format. The program truncated your full address after the @.
We've been over this many times.  groups.io censors email addresses so
they can't be scraped by spammers.  This is the same as what Yahoo
Groups did.  The only way around it is to spell out the address so it
doesn't look like an address.

However, you can ALWAYS reply privately from the groups.io web site.
There is no excuse for spamming the list with private messages.

Re: 184 Time-Mark Generator lamp

Melvin Gleep
 

Hi Sean,

There are four indents punched into the bottom end of the aluminum can, punching into the plastic base and thus holding it in place. If you take a small drill bit or burring tool, you can carefully twist out the aluminum indents and then easily pry off the base, revealing the insides. After replacing the bulb, you can just reinsert the base with a drop of glue.

Regards,
Melvin

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of sdturne@q.com
Sent: Mittwoch, 3. Juni 2020 05:17
To: TekScopes@groups.io
Subject: Re: [TekScopes] 184 Time-Mark Generator lamp

Hi Melvin,

How did you get the lamp module open? It looks very well sealed to me.

Sean

On Mon, Jun 1, 2020 at 06:11 AM, Melvin Gleep wrote:


Hi Sean,

I had the same Problem, but it is easy to fix. You can take the plugable power
lamp apart and you will find a small bulb inside. Just remove it and solder in
a replacement bulb. I had one in my parts bin (I think it was 7volts at About
20 mA, but not sure) which fit nicely. If you cannot find a replcement bulb,
just use an LED instead (with limiting resistor, of Course) which fits nicely
within the lamp plug housing.

Re: TM 500 Front Panels

Michael W. Lynch
 

To anyone interested in this subject,

Here is the THINGIVERSE Link to a blank front panel for the basic TM500 Plug in.

https://www.thingiverse.com/thing:4268888

This should be able to be modified for almost any specific application.

I am going to print one and see how it turns out. I will update with the results.

Sincerely,

--
Michael Lynch
Dardanelle, Arkansas

Re: Oscilloscope Sales

David DiGiacomo
 

On Tue, Jun 2, 2020 at 10:48 PM M Yachad <@yachadm> wrote:

Reed

Please write your email using the AT format. The program truncated your full address after the @.
We've been over this many times. groups.io censors email addresses so
they can't be scraped by spammers. This is the same as what Yahoo
Groups did. The only way around it is to spell out the address so it
doesn't look like an address.

However, you can ALWAYS reply privately from the groups.io web site.
There is no excuse for spamming the list with private messages.

Re: Oscilloscope Sales

Colin Herbert
 

It was ok on my computer. I wonder why that should happen? Perhaps Dennis has some idea?
Colin.

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Reed Dickinson
Sent: 03 June 2020 07:06
To: TekScopes@groups.io
Subject: Re: [TekScopes] Oscilloscope Sales

Hi:
I have no idea how that happened. Here it is again:
reed714@...
phone, after noon only714 838 6241
On Tuesday, June 2, 2020, 09:48:52 PM PDT, M Yachad <@yachadm> wrote:

Reed

Please write your email using the AT format. The program truncated your full address after the @.

Thanks

Menahem Yachad

Re: Oscilloscope Sales

Reed Dickinson
 

Hi:
I have no idea how that happened.  Here it is again:
reed714@...
phone, after noon only714 838 6241

On Tuesday, June 2, 2020, 09:48:52 PM PDT, M Yachad <@yachadm> wrote:

Reed

Please write your email using the AT format. The program truncated your full address after the @.

Thanks

Menahem Yachad

Re: TM 500 Front Panels

Michael W. Lynch
 

Steve,

You are right! I just did another search and it came up.

Michael Lynch

From My I-Phone

@mlynch002

479-477-1115

On Jun 3, 2020, at 12:15 AM, Steve Dench <sjdench48@...> wrote:

Hi Michael
When you go into the thingiverse article the front panel is there also, but
needs cut out for the pull tab etc to be added.
Steve.

On Wed, 3 Jun. 2020, 3:07 pm Mlynch001, <@mlynch001> wrote:

Steve wrote:
There is an unfinshed one on >thingiverse as part of an upload under
"Tektronix TM500 module parts" that >someone has uploaded, it may be a
good starting point?
Steve,

I saw this in an earlier search of Thingiverse, I believe those are the
top and bottom panels. I’m going to keep searching from time to time to
see if anything else pops up.

Thanks for the tip.

Sincerely,
--
Michael Lynch
Dardanelle, AR




--
Michael Lynch
Dardanelle, Arkansas

Re: TM 500 Front Panels

Steve Dench
 

Hi Michael
When you go into the thingiverse article the front panel is there also, but
needs cut out for the pull tab etc to be added.
Steve.

On Wed, 3 Jun. 2020, 3:07 pm Mlynch001, <@mlynch001> wrote:

Steve wrote:
There is an unfinshed one on >thingiverse as part of an upload under
"Tektronix TM500 module parts" that >someone has uploaded, it may be a
good starting point?
Steve,

I saw this in an earlier search of Thingiverse, I believe those are the
top and bottom panels. I’m going to keep searching from time to time to
see if anything else pops up.

Thanks for the tip.

Sincerely,
--
Michael Lynch
Dardanelle, AR



Re: TM 500 Front Panels

Mlynch001
 

Steve wrote:
There is an unfinshed one on >thingiverse as part of an upload under
"Tektronix TM500 module parts" that >someone has uploaded, it may be a >good starting point?
Steve,

I saw this in an earlier search of Thingiverse, I believe those are the top and bottom panels. I’m going to keep searching from time to time to see if anything else pops up.

Thanks for the tip.

Sincerely,
--
Michael Lynch
Dardanelle, AR