Date   

Re: 7104 -7854 SMPS Dummy Load Construction Article

Robert Calk Jr.
 

Looks nice! Thanks Dennis.


Re: UNC Taps

Jim Olson <v_12eng@...>
 

You can also remove broken taps and or steel screws and bolts from aluminum using nitric acid. It will dissolve the steel and leave the alum bright and shiny. Just use a glass tube over the hole to pour the acid down.

Jim O

On January 20, 2019 at 6:22 PM n4buq <n4buq@knology.net mailto:n4buq@knology.net > wrote:


I did not know alum would etch steel that way. Perhaps useful for more than just taps.

As for the larger taps etching faster, I'd guess it's due to the larger surface area.

Thanks,
Barry - N4BUQ

----- Original Message -----

> > From: "Ovidiu Popa [Business]" <ovidiu.popa@rogers.com mailto:ovidiu.popa@rogers.com >
To: TekScopes@groups.io mailto:TekScopes@groups.io
Sent: Sunday, January 20, 2019 4:20:22 PM
Subject: Re: [TekScopes] UNC Taps

In such cases I just etch away the broken tap in a supra-saturated hot
solution of alum. May have to "cook" the aluminum part overnight, but the
result is perfect. For large aluminum parts, I just use a double turkey
aluminum pan, dip the part in the alum solution (broken tap side down),
place it on the barbecue, when it's close to boiling add more alum until
saturating the solution, and leave it overnight (make sure the temperature
is high, but below the boiling point).



I've etched taps from 2-56 to 3/8-24. Interesting enough, small taps take
longer time to etch away.



Won't work for broken taps in steel, of course.



O.



>Then one day I had a hardened set screw

>sieze and break in a nonreplaceable machined aluminum component (a

>heat block put together without anti-sieze). If it was a regular screw

>I could have drilled it out but trying to get that one out is like

>trying to drill through a rock in a lump of butter. After many bad

>words I pulled the disintegrator out and got it set up. It's a bit of

>a pain and it gets messy, but it took about 10 minutes to remove the

>screw and clean up the hole.



>


Re: UNC Taps

n4buq
 

I did not know alum would etch steel that way. Perhaps useful for more than just taps.

As for the larger taps etching faster, I'd guess it's due to the larger surface area.

Thanks,
Barry - N4BUQ

----- Original Message -----
From: "Ovidiu Popa [Business]" <ovidiu.popa@rogers.com>
To: TekScopes@groups.io
Sent: Sunday, January 20, 2019 4:20:22 PM
Subject: Re: [TekScopes] UNC Taps

In such cases I just etch away the broken tap in a supra-saturated hot
solution of alum. May have to "cook" the aluminum part overnight, but the
result is perfect. For large aluminum parts, I just use a double turkey
aluminum pan, dip the part in the alum solution (broken tap side down),
place it on the barbecue, when it's close to boiling add more alum until
saturating the solution, and leave it overnight (make sure the temperature
is high, but below the boiling point).



I've etched taps from 2-56 to 3/8-24. Interesting enough, small taps take
longer time to etch away.



Won't work for broken taps in steel, of course.



O.



Then one day I had a hardened set screw
sieze and break in a nonreplaceable machined aluminum component (a
heat block put together without anti-sieze). If it was a regular screw
I could have drilled it out but trying to get that one out is like
trying to drill through a rock in a lump of butter. After many bad
words I pulled the disintegrator out and got it set up. It's a bit of
a pain and it gets messy, but it took about 10 minutes to remove the
screw and clean up the hole.




Re: Tek Probe Cables free to a good home

 

After a few other members were able to identify which probes my cables were for I was concerned that I didn't find any references to these cable part numbers when I searched for them so I decided to make another attempt myself.

The first time I tried (before sending my original post) I found nothing at all. Now that I am doing this a second time more determined to duplicate the results from Emil and Jack I still found extremely little information and some of it seems to contradict what they found.

For instance, a new (to me) site called SMC Electronics (http://www.smcelectronics.com) reports these two part numbers are for the same P6131 probe

175-3217-00:
Tektronix part numbers: 175-3217-00/206-0214-00/ 206-0289-00/134-0044-00.
Tektronix P6131 Attenuator/Cable Assembly

175-8011-00:
Tektronix part numbers: 010-6131-00/131-1799-03/ 200-2547-03/175-8011-00.
Tektronix P6131 Attenuator BNC Readout

BUT when I refer to the P6131 Instruction Manual on TekWiki (070-5514-03) it says that the cable should be 174-0972-00. This isn't a 175-8011-00.

The TekWiki Instruction Sheet for the P6122 (070-5512-00) says the correct cable is 174-0069-00 which is not 175-3217-00. Fortunately I found the P6122 Instruction Manual (070-4431-00) which does list all the cables used on this probe. They are (in chronological order): 175-3217-00, 175-9411-00, 174-0069-00, 174-0967-00. Apparently Tek has been changing the part number for this cable quite often. This explains some, but not all, of the confusing numbers I am finding.

The 1986 catalog on page 447 says the cable for the P6122 is 175-9411-00 for 1.5 meters, not 175-3217-00. It also says the cable for the P6131 is 175-9414-00 for 1.3 meters, not 175-8011-00.
Both of those numbers sound like Tek came up with newer replacement cables for these two probes and as of 1986 the numbers were correct. It looks like they were changed since then to 174-xxxx-xx numbers.

The TekWiki P6006 Instruction manual (010-0127-00 changed to 070-0381-00) lists the cable as 175-0281-00 for the 12ft BNC version of the probe. At least everyone agrees on this one.

I trust Emil and Jack's results. Part of the problem seems to be Tek making a lot of changes to their part numbers.

Dennis Tillman W7PF

-----Original Message-----
From: Jack Wills
Sent: Saturday, January 19, 2019 10:43 PM

Based on a little Googling:

175-8011-00 P6131
175-3217-00 P6122
175-1205-00 P6061
175-0281-00 P6006
Jack Wills
-------- Forwarded Message --------
Date: Sun, 20 Jan 2019 02:47:13 +0200
From: Emil <driller2old@yahoo.com>

Hi Dennis,
Greetings from Romania.
This is what i was able to find:
175-8011-00 1.3 m 39 Ohm P6131
175-3217-00 1.5 m 39 Ohm P6122
175-1205-00 ?????
175-0281-00 P6006


On Sat, Jan 19, 2019 at 6:25 PM Dennis Tillman W7PF
<dennis@ridesoft.com>
wrote:

Hi Dave,

I looked in the detailed index of the 175-xxxx-xx section of my 1988
edition of the Common Parts Design Catalog 6: Wire, Insulation, and
Power Supplies.

None of them were listed!
What are the odds of that happening?

At least two of them are recent numbers so I would think they can't
be obsolete.
They are definitely Probe cables so I thought for sure they would be
there.

Dennis Tillman W7PF


--
Dennis Tillman W7PF
TekScopes Moderator


Re: UNC Taps

Ovidiu Popa [Business]
 

In such cases I just etch away the broken tap in a supra-saturated hot
solution of alum. May have to "cook" the aluminum part overnight, but the
result is perfect. For large aluminum parts, I just use a double turkey
aluminum pan, dip the part in the alum solution (broken tap side down),
place it on the barbecue, when it's close to boiling add more alum until
saturating the solution, and leave it overnight (make sure the temperature
is high, but below the boiling point).



I've etched taps from 2-56 to 3/8-24. Interesting enough, small taps take
longer time to etch away.



Won't work for broken taps in steel, of course.



O.

Then one day I had a hardened set screw
sieze and break in a nonreplaceable machined aluminum component (a
heat block put together without anti-sieze). If it was a regular screw
I could have drilled it out but trying to get that one out is like
trying to drill through a rock in a lump of butter. After many bad
words I pulled the disintegrator out and got it set up. It's a bit of
a pain and it gets messy, but it took about 10 minutes to remove the
screw and clean up the hole.


Re: Basic Rule of all mailing Lists

Jim Ford
 

Yep, that's about the way it works! ;)
Jim Ford 


Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------From: Dennis Tillman W7PF <dennis@ridesoft.com> Date: 1/20/19 1:14 PM (GMT-08:00) To: TekScopes@groups.io Subject: [TekScopes] Basic Rule of all mailing Lists
Hi John,
Well done!
This is going up on my wall as a great reference.
All mailing list moderators should have a copy of this.
Dennis Tillman W7PF

-----Original Message-----
From: John Parkins G8KVP
Sent: Sunday, January 20, 2019 12:33 AM
Subject: Re: [TekScopes] UNC Taps

Hello,

Unfortunately  it  seems  to  be  a  rule  in  mailing  lists that the
following happens:

1. a slightly OT post is made.
2. as they all do they generate lots of responses.
3. they generate even more OT comments and go off at tangents.
4. someone asks that the members bring it under control.
5.  that  generates  even  more  post  in support of the OT (slightly)
post.
6.  the,  "if  you  don't  like  it you can always use the delete key"
comment is made.
7. the comments slowly die down, over the next few weeks.
8. the moderator will ask that the topic be put to bed.

This  is  how a question about where to purchase UNC taps can have 500
responses but only 5 or 6 which answer the original question.

This is how mailing list work and it will always be so, it's the law!
--
Best regards,
  John                            mailto:john@g8kvp.com



--
Dennis Tillman W7PF
TekScopes Moderator


Basic Rule of all mailing Lists

 

Hi John,
Well done!
This is going up on my wall as a great reference.
All mailing list moderators should have a copy of this.
Dennis Tillman W7PF

-----Original Message-----
From: John Parkins G8KVP
Sent: Sunday, January 20, 2019 12:33 AM
Subject: Re: [TekScopes] UNC Taps

Hello,

Unfortunately it seems to be a rule in mailing lists that the
following happens:

1. a slightly OT post is made.
2. as they all do they generate lots of responses.
3. they generate even more OT comments and go off at tangents.
4. someone asks that the members bring it under control.
5. that generates even more post in support of the OT (slightly)
post.
6. the, "if you don't like it you can always use the delete key"
comment is made.
7. the comments slowly die down, over the next few weeks.
8. the moderator will ask that the topic be put to bed.

This is how a question about where to purchase UNC taps can have 500
responses but only 5 or 6 which answer the original question.

This is how mailing list work and it will always be so, it's the law!
--
Best regards,
John mailto:john@g8kvp.com



--
Dennis Tillman W7PF
TekScopes Moderator


Re: Tek's new president tours vintageTEK

 

TekScopes has no involvement with that press release.
You need to contact vintageTEK directly for the permission to reuse portions of it.
Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Tam Hanna
Sent: Sunday, January 20, 2019 4:38 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Tek's new president tours vintageTEK

Hello,

can I maybe repost one of the pictures of the visit to my Instagram?


Tam

--
- - - - -
With best regards
Tam HANNA

Enjoy electronics? Join 13500 followers by visiting the Crazy Electronics Lab
at https://www.instagram.com/tam.hanna/




--
Dennis Tillman W7PF
TekScopes Moderator


Re: Tek and DEC - just curious

Bruce Lane
 

I'm ignorant of any formal arrangement between the two, but I will say
this: During the time I was taking my first electronics courses at
Merritt College (Oakland, California), in the mid-late 70's, I
discovered their AAS Degree/Electronics program had been tweaked in such
a way that DEC's Bay Area office was hiring the kids right out of
graduation as field techs.

The campus also had a full-blown PDP-11/70 system. In fact, that's what
I took my first programming steps on. I can't say for certain, but I
would not be surprised if whatever arrangement the district (Peralta
Community College District) had with DEC included free maintenance in
return for being a key training spot for field techs.

Keep the peace(es).

On 20-Jan-19 02:13, Tim Phillips wrote:
from Tim P (UK)

I have always been curious about the tie-in between Tektronix and DEC,
particularly
regarding the LSI and semiconductor test systems. I was browsing the 1987
catalog, which shows Tek equipment alongside a DEC PDP11 (?) computer.
The photo I am looking at is the one with the rack of 48 sampling heads.
What was the arrangement between the two companies ?

Tim
--
---
Bruce Lane, ARS KC7GR
http://www.bluefeathertech.com
kyrrin (at) bluefeathertech dot com
"Quando Omni Flunkus Moritati" (Red Green)


Re: Tek and DEC - just curious

Dale H. Cook
 

At 05:13 AM 1/20/2019, you wrote:

What was the arrangement between the two companies?
I would strongly suspect that Tek bought DEC computers for their computer controlled systems, whereas HP developed their own computers for that purpose. I have seen that in my own line of work, where many manufacturers developed their own digital controllers for their equipment, but the best (and most expensive) brand was controlled by PDP-8/M computers.

Dale H. Cook, GR/HP/Tek Collector, Roanoke/Lynchburg, VA
https://plymouthcolony.net/starcity/radios/index.html


Re: Tek's new president tours vintageTEK

Tam Hanna
 

Hello,

can I maybe repost one of the pictures of the visit to my Instagram?


Tam

--
- - - - -
With best regards
Tam HANNA

Enjoy electronics? Join 13500 followers by visiting the Crazy Electronics Lab at https://www.instagram.com/tam.hanna/


Tek and DEC - just curious

Tim Phillips
 

from Tim P (UK)

I have always been curious about the tie-in between Tektronix and DEC,
particularly
regarding the LSI and semiconductor test systems. I was browsing the 1987
catalog, which shows Tek equipment alongside a DEC PDP11 (?) computer.
The photo I am looking at is the one with the rack of 48 sampling heads.
What was the arrangement between the two companies ?

Tim


Re: UNC Taps

John Parkins G8KVP
 

Hello,

Unfortunately it seems to be a rule in mailing lists that the
following happens:

1. a slightly OT post is made.
2. as they all do they generate lots of responses.
3. they generate even more OT comments and go off at tangents.
4. someone asks that the members bring it under control.
5. that generates even more post in support of the OT (slightly)
post.
6. the, "if you don't like it you can always use the delete key"
comment is made.
7. the comments slowly die down, over the next few weeks.
8. the moderator will ask that the topic be put to bed.

This is how a question about where to purchase UNC taps can have 500
responses but only 5 or 6 which answer the original question.

This is how mailing list work and it will always be so, it's the law!




--
Best regards,
John mailto:john@g8kvp.com


Re: Tek Probe Cables free to a good home

 

Hi Jack,
Thanks, I didn't have much luck when I googled those part numbers and when I couldn't find them in the common parts catalog I assumed there was no point in searching further.

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Jack
Wills
Sent: Saturday, January 19, 2019 10:43 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Tek Probe Cables free to a good home

Based on a little Googling:

175-8011-00 P6131

175-3217-00 P6122

175-1205-00 P6061

175-0281-00 P6006

Jack Wills

On Sat, Jan 19, 2019 at 6:25 PM Dennis Tillman W7PF <dennis@ridesoft.com>
wrote:

Hi Dave,

I looked in the detailed index of the 175-xxxx-xx section of my 1988
edition of the Common Parts Design Catalog 6: Wire, Insulation, and
Power Supplies.

None of them were listed!
What are the odds of that happening?

At least two of them are recent numbers so I would think they can't be
obsolete.
They are definitely Probe cables so I thought for sure they would be there.

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
Artekmedia
Sent: Saturday, January 19, 2019 3:25 PM
Subject: Re: [TekScopes] Tek Probe Cables free to a good home

Gotta be in the RPR's somewhere 8^)

If somebody can identify what they are for, or they can use one or
more
of them:
PLEASE CONTACT ME OFF LIST AT DENNIS AT RIDESOFT DOT COM
175-8011-00
175-3217-00
175-1205-00
175-0281-00

Dennis Tillman w7pf
--
Dave
Manuals@ArtekManuals.com
www.ArtekManuals.com



--
Dennis Tillman W7PF
TekScopes Moderator





--
Dennis Tillman W7PF
TekScopes Moderator


Re: Tek 2782 Schematics Uploaded to KO4BB

josephlevy
 

Hi
I conversed with the (now the 'late') great Dean Kidd abt. 10 yrs ago and he said that Tek never got the 'service manual' for the 2782 to more than 'beta' thus could not be procured...

He said he had schematics and I foolishly did not ask for them then (the 2782 was working fine,(a fantastic SA even in today level of performance!)
Then the 2782 failed and Mr. Kidd was not with us anymore....
Than you so much Bob Koller and KO4BB for uploading the schematics.


Re: Tek Probe Cables free to a good home

Jack Wills
 

Based on a little Googling:

175-8011-00 P6131

175-3217-00 P6122

175-1205-00 P6061

175-0281-00 P6006

Jack Wills

On Sat, Jan 19, 2019 at 6:25 PM Dennis Tillman W7PF <dennis@ridesoft.com>
wrote:

Hi Dave,

I looked in the detailed index of the 175-xxxx-xx section of my 1988
edition
of the Common Parts Design Catalog 6: Wire, Insulation, and Power
Supplies.

None of them were listed!
What are the odds of that happening?

At least two of them are recent numbers so I would think they can't be
obsolete.
They are definitely Probe cables so I thought for sure they would be there.

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
Artekmedia
Sent: Saturday, January 19, 2019 3:25 PM
Subject: Re: [TekScopes] Tek Probe Cables free to a good home

Gotta be in the RPR's somewhere 8^)

If somebody can identify what they are for, or they can use one or more
of them:
PLEASE CONTACT ME OFF LIST AT DENNIS AT RIDESOFT DOT COM
175-8011-00
175-3217-00
175-1205-00
175-0281-00

Dennis Tillman w7pf
--
Dave
Manuals@ArtekManuals.com
www.ArtekManuals.com



--
Dennis Tillman W7PF
TekScopes Moderator




Re: vintageTEK museum releases Replaceable Parts Registry (RPR)

Dave Brown
 

These documents were on microfiche because they were sent to the field offices and they required compact storage. Eventually microfiche was phased out by digital documents, probably by the mid 1990s. I don't know exactly when. We have some sections of a later RPR but it is not complete and doesn't cover any of the desired part numbers. 1986 is as late as we have at the museum currently.

Dave


Re: Tek 2782 Schematics Uploaded to KO4BB

John Miles
 

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
Bob Koller via Groups.Io
Sent: Friday, January 04, 2019 2:22 PM
To: TekScopes@groups.io
Subject: [TekScopes] Tek 2782 Schematics Uploaded to KO4BB

FYI, I have just uploaded the schematics for the Tek 2782 spectrum analyzer
to KO4BB. It may be awhile until they are posted.
These are scans from the 11"X17" set I have, sorry I don't have anything else.

Enjoy!
Thanks for the upload, Bob. I have been hoping someone would come up with these!

-- john, KE5FX


Re: Tek Probe Cables free to a good home

 

Hi Dave,

I looked in the detailed index of the 175-xxxx-xx section of my 1988 edition
of the Common Parts Design Catalog 6: Wire, Insulation, and Power Supplies.

None of them were listed!
What are the odds of that happening?

At least two of them are recent numbers so I would think they can't be
obsolete.
They are definitely Probe cables so I thought for sure they would be there.

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
Artekmedia
Sent: Saturday, January 19, 2019 3:25 PM
Subject: Re: [TekScopes] Tek Probe Cables free to a good home

Gotta be in the RPR's somewhere 8^)

If somebody can identify what they are for, or they can use one or more
of them:
PLEASE CONTACT ME OFF LIST AT DENNIS AT RIDESOFT DOT COM
175-8011-00
175-3217-00
175-1205-00
175-0281-00

Dennis Tillman w7pf
--
Dave
Manuals@ArtekManuals.com
www.ArtekManuals.com



--
Dennis Tillman W7PF
TekScopes Moderator


Re: UNC Taps

 

Like everything, there are those who found the topic informative and those
who didn't.
If the discussion of taps has run its course please
AVOID THE URGE TO EXPRESS AN OPINION ABOUT IT.

Thank you,
Dennis Tillman W7PF




--
Dennis Tillman W7PF
TekScopes Moderator

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