Date   

Re: Persuading a 7S12 to play nice with a 7934.

Richard Steedman
 

Thanks for your insight on this Albert.

By coincidence, a paper copy of the 7S12 manual which I purchased on eBay a while back arrived today, dated June 1986. So now I have yet another reference to consult. It shows the same arrangement as the BAMA manual - P600 connects the base of the 2N2907A either to ground or to the collectors of the transistors which perform the (B7 XOR A16) function.

It's strange. With a DMM I could not find a connection of 2N2907A-base to any other component in the neighborhood or a A/B contact. But then the pair of NPN transistors with their bases to the B7 and A16 inputs would be useless. Do I overlook something?

You didn't accidentally have your P600 set such that the link between the NPNs and the 2N2907A-base was open?

As I said, my board has no P600. The collectors of the XOR transistors and the base of the 2N2907A are directly connected by a trace on the non-component side of the board. Where is P600 located on your board? I don't see it depicted on the board illustrations of any of the manuals I have looked at.

This circuit seems to have undergone many revisions over the years - perhaps reflecting issues encountered with newer generation mainframes. I share your unease about reducing the pullup resistor to 6kΩ. My other thought was to put the B7 input through an opto-isolator to get a proper 0V/5V swing and see if that cleans things up. This is easily done by lifting one end of R691 (the 430Ω resistor) off the board.

Richard


Re: 2440 and 2465B battery/ram replacement

Bob Albert
 

Chuck, where are you?  I am in Los Angeles and would like to find someone who is willing to get my Tek 2440 working.  Maybe that's not you.
The history is that when I got it, it worked but would not hold settings on power off.  I decided it must need new NVRAM modules and swapped in some I got from China on ebay.  Now the scope doesn't work at all.  I swapped one module back but still no joy.  It turns on but the display is messed up and it won't respond to any controls.
I would like to find someone who is smarter than I who is willing to correct my mistakes and get the scope operational again.  If you can assist in any way I would appreciate it.  I am willing to pay a reasonable amount, as well.
Thanks, Bob

On Friday, March 26, 2021, 07:24:54 PM PDT, Chuck Harris <cfharris@erols.com> wrote:

Hi Mark,

I am always willing to do the work.  Contact me
off group.

-Chuck Harris


On Fri, 26 Mar 2021 15:45:26 -0700 "Mark Vincent"
<orangeglowaudio@gmail.com> wrote:
Reinhard,

      I have seen this site. It is great. I do NOT have a programmer
or access to one. I do NOT have ANY TM500/5000 anything. I do not
know anyone locally that has these. This is why I asked here to see
if anyone will do the work.

Mark





Re: Repair of Set Screw Attachment for Tek-made VAR Pots

Dave Wise
 

You ought to upload the article to TekWiki at w140.com .


Dave Wise

________________________________
From: TekScopes@groups.io <TekScopes@groups.io> on behalf of Wayne via groups.io <WAYNECL=AOL.COM@groups.io>
Sent: Friday, March 26, 2021 2:43 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Repair of Set Screw Attachment for Tek-made VAR Pots

Nice solution! Haven't run across a need for one yet, but if I do, the lathe is right there waiting! Thanks for the post and the nice pictures!


Re: 2440 and 2465B battery/ram replacement

Chuck Harris <cfharris@...>
 

Hi Mark,

I am always willing to do the work. Contact me
off group.

-Chuck Harris


On Fri, 26 Mar 2021 15:45:26 -0700 "Mark Vincent"
<orangeglowaudio@gmail.com> wrote:
Reinhard,

I have seen this site. It is great. I do NOT have a programmer
or access to one. I do NOT have ANY TM500/5000 anything. I do not
know anyone locally that has these. This is why I asked here to see
if anyone will do the work.

Mark





Re: I built a TM500 mainframe tester, and updated the design. Someone might find this useful?

Dave Daniel
 

I’ll check that. It sounds like the culprit. Thanks

DaveD

On Mar 26, 2021, at 19:44, Larry McDavid <lmcdavid@lmceng.com> wrote:

Be careful to include the final hyphen character in the Google Drive link; that final character is often not in the active email link.LarrySent via the Samsung Galaxy S10
-------- Original message --------From: Dave Seiter <d.seiter@att.net> Date: 3/26/21 4:34 PM (GMT-08:00) To: TekScopes@groups.io Subject: Re: [TekScopes] I built a TM500 mainframe tester, and updated the design. Someone might find this useful? I just tried the "drive/google" link from this email and it worked fine.-Dave On Friday, March 26, 2021, 03:14:22 PM PDT, Dave Daniel <kc0wjn@gmail.com> wrote: Can someone point me to the correct links for the documentation? Both links below are unreachable.ThanksDaveDOn 12/31/2020 2:27 PM, Jared Cabot via groups.io wrote:> Hi all,>> I have been accumulating TM500 modules and mainframes for a little while, so I recently finished building an 067-1201-99 TM500 mainframe tester from the Tek construction notes floating around.> I updated the design somewhat and designed it for simplified construction (Not a single wire to strip and solder!) and I thought someone here might be interested in taking a look or even building one themselves.> Here's a link to the youtube video:> https://www.youtube.com/watch?v=Afwqtc6Fxd4>> And here's a link to the google drive with all the gerbers and schematics and stuff. I went so far as to rewrite the manual with the alterations and corrections included.> https://drive.google.com/drive/folders/1yj52Z_BtGZ7Q9BB2jS9Lf2Uz39turS4->> Direct link to the new manual:> https://drive.google.com/file/d/1iqpcqheb01qMioQwcUhyWv6A37v2HPro/view?usp=sharing>> Let me know what you think, and let me know if you see any errors that need correcting. :)>> Regards> Jared.>>> >>>-- This email has been checked for viruses by Avast antivirus software.https://www.avast.com/antivirus




Re: I built a TM500 mainframe tester, and updated the design. Someone might find this useful?

Larry McDavid
 

Be careful to include the final hyphen character in the Google Drive link; that final character is often not in the active email link.LarrySent via the Samsung Galaxy S10

-------- Original message --------From: Dave Seiter <d.seiter@att.net> Date: 3/26/21 4:34 PM (GMT-08:00) To: TekScopes@groups.io Subject: Re: [TekScopes] I built a TM500 mainframe tester, and updated the design. Someone might find this useful? I just tried the "drive/google" link from this email and it worked fine.-Dave    On Friday, March 26, 2021, 03:14:22 PM PDT, Dave Daniel <kc0wjn@gmail.com> wrote:  Can someone point me to the correct links for the documentation? Both links below are unreachable.ThanksDaveDOn 12/31/2020 2:27 PM, Jared Cabot via groups.io wrote:> Hi all,>> I have been accumulating TM500 modules and mainframes for a little while, so I recently finished building an 067-1201-99 TM500 mainframe tester from the Tek construction notes floating around.> I updated the design somewhat and designed it for simplified construction (Not a single wire to strip and solder!) and I thought someone here might be interested in taking a look or even building one themselves.> Here's a link to the youtube video:> https://www.youtube.com/watch?v=Afwqtc6Fxd4>> And here's a link to the google drive with all the gerbers and schematics and stuff. I went so far as to rewrite the manual with the alterations and corrections included.> https://drive.google.com/drive/folders/1yj52Z_BtGZ7Q9BB2jS9Lf2Uz39turS4->> Direct link to the new manual:> https://drive.google.com/file/d/1iqpcqheb01qMioQwcUhyWv6A37v2HPro/view?usp=sharing>> Let me know what you think, and let me know if you see any errors that need correcting. :)>> Regards> Jared.>>> >>>-- This email has been checked for viruses by Avast antivirus software.https://www.avast.com/antivirus


Re: I built a TM500 mainframe tester, and updated the design. Someone might find this useful?

Dave Daniel
 

Thanks.

On Mar 26, 2021, at 19:33, Dave Seiter <d.seiter@att.net> wrote:

I just tried the "drive/google" link from this email and it worked fine.
-Dave
On Friday, March 26, 2021, 03:14:22 PM PDT, Dave Daniel <kc0wjn@gmail.com> wrote:

Can someone point me to the correct links for the documentation? Both
links below are unreachable.

Thanks

DaveD


On 12/31/2020 2:27 PM, Jared Cabot via groups.io wrote:
Hi all,

I have been accumulating TM500 modules and mainframes for a little while, so I recently finished building an 067-1201-99 TM500 mainframe tester from the Tek construction notes floating around.
I updated the design somewhat and designed it for simplified construction (Not a single wire to strip and solder!) and I thought someone here might be interested in taking a look or even building one themselves.
Here's a link to the youtube video:
https://www.youtube.com/watch?v=Afwqtc6Fxd4

And here's a link to the google drive with all the gerbers and schematics and stuff. I went so far as to rewrite the manual with the alterations and corrections included.
https://drive.google.com/drive/folders/1yj52Z_BtGZ7Q9BB2jS9Lf2Uz39turS4-

Direct link to the new manual:
https://drive.google.com/file/d/1iqpcqheb01qMioQwcUhyWv6A37v2HPro/view?usp=sharing

Let me know what you think, and let me know if you see any errors that need correcting. :)

Regards
Jared.






--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus












Re: I built a TM500 mainframe tester, and updated the design. Someone might find this useful?

Dave Seiter
 

I just tried the "drive/google" link from this email and it worked fine.
-Dave

On Friday, March 26, 2021, 03:14:22 PM PDT, Dave Daniel <kc0wjn@gmail.com> wrote:

Can someone point me to the correct links for the documentation? Both
links below are unreachable.

Thanks

DaveD


On 12/31/2020 2:27 PM, Jared Cabot via groups.io wrote:
Hi all,

I have been accumulating TM500 modules and mainframes for a little while, so I recently finished building an 067-1201-99 TM500 mainframe tester from the Tek construction notes floating around.
I updated the design somewhat and designed it for simplified construction (Not a single wire to strip and solder!) and I thought someone here might be interested in taking a look or even building one themselves.
Here's a link to the youtube video:
https://www.youtube.com/watch?v=Afwqtc6Fxd4

And here's a link to the google drive with all the gerbers and schematics and stuff. I went so far as to rewrite the manual with the alterations and corrections included.
https://drive.google.com/drive/folders/1yj52Z_BtGZ7Q9BB2jS9Lf2Uz39turS4-

Direct link to the new manual:
https://drive.google.com/file/d/1iqpcqheb01qMioQwcUhyWv6A37v2HPro/view?usp=sharing

Let me know what you think, and let me know if you see any errors that need correcting. :)

Regards
Jared.






--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus


Re: 2440 and 2465B battery/ram replacement

Mark Vincent
 

Reinhard,

I have seen this site. It is great. I do NOT have a programmer or access to one. I do NOT have ANY TM500/5000 anything. I do not know anyone locally that has these. This is why I asked here to see if anyone will do the work.

Mark


Re: I built a TM500 mainframe tester, and updated the design. Someone might find this useful?

Dave Daniel
 

Can someone point me to the correct links for the documentation? Both links below are unreachable.

Thanks

DaveD

On 12/31/2020 2:27 PM, Jared Cabot via groups.io wrote:
Hi all,

I have been accumulating TM500 modules and mainframes for a little while, so I recently finished building an 067-1201-99 TM500 mainframe tester from the Tek construction notes floating around.
I updated the design somewhat and designed it for simplified construction (Not a single wire to strip and solder!) and I thought someone here might be interested in taking a look or even building one themselves.
Here's a link to the youtube video:
https://www.youtube.com/watch?v=Afwqtc6Fxd4

And here's a link to the google drive with all the gerbers and schematics and stuff. I went so far as to rewrite the manual with the alterations and corrections included.
https://drive.google.com/drive/folders/1yj52Z_BtGZ7Q9BB2jS9Lf2Uz39turS4-

Direct link to the new manual:
https://drive.google.com/file/d/1iqpcqheb01qMioQwcUhyWv6A37v2HPro/view?usp=sharing

Let me know what you think, and let me know if you see any errors that need correcting. :)

Regards
Jared.




--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus


Re: Repair of Set Screw Attachment for Tek-made VAR Pots

Paul Amaranth
 

Quite an elegant solution!

Paul

On Fri, Mar 26, 2021 at 02:20:11PM -0700, Jim Adney wrote:
Quite a few years ago, I came across my first broken Tek-made VAR pot, the grey plastic ones. The plastic had broken near where the shaft enters, so that the set screw could no longer bind tightly to the shaft. As spares seemed like they might be hard to find, I came up with a more permanent solution, which you can see here:

https://groups.io/g/TekScopes/photo/262268/1 and also the following photo

These rings are tapped 4-40, the same as the OE set screws, but the ring encircles the cross-shaped portion of the pot allowing plenty of tightening of the set screw. The new, longer, set screw passes thru the original 4-40 hole, but does not use those threads, so this repair will fix a pot with stripped threads or fractured plastic there.

I made a supply of these for myself and have used a half dozen of them on various 3 series plugins. They take up almost no more room than the original pot, so I've yet to encounter a place where this wasn't a quick and neat fix. I have a small supply of these if anyone needs one, or feel free to copy the idea and make your own.
--
Paul Amaranth, GCIH | Manchester MI, USA
Aurora Group of Michigan, LLC | Security, Systems & Software
paul@AuroraGrp.Com | Unix/Linux - We don't do windows


Re: Repair of Set Screw Attachment for Tek-made VAR Pots

Wayne
 

Nice solution! Haven't run across a need for one yet, but if I do, the lathe is right there waiting! Thanks for the post and the nice pictures!


Repair of Set Screw Attachment for Tek-made VAR Pots

Jim Adney
 

Quite a few years ago, I came across my first broken Tek-made VAR pot, the grey plastic ones. The plastic had broken near where the shaft enters, so that the set screw could no longer bind tightly to the shaft. As spares seemed like they might be hard to find, I came up with a more permanent solution, which you can see here:

https://groups.io/g/TekScopes/photo/262268/1 and also the following photo

These rings are tapped 4-40, the same as the OE set screws, but the ring encircles the cross-shaped portion of the pot allowing plenty of tightening of the set screw. The new, longer, set screw passes thru the original 4-40 hole, but does not use those threads, so this repair will fix a pot with stripped threads or fractured plastic there.

I made a supply of these for myself and have used a half dozen of them on various 3 series plugins. They take up almost no more room than the original pot, so I've yet to encounter a place where this wasn't a quick and neat fix. I have a small supply of these if anyone needs one, or feel free to copy the idea and make your own.


Re: Recapping Tektronix 2465

Chuck Harris <cfharris@...>
 

Why attribute that to me?

I didn't write the statement you quote as being mine,
but I can see where it would make sense.

Try it this way:

Pink paint can be used to repaint a red fire truck,
but pink paint is not recommended to repaint a red fire truck.

-Chuck Harris


On Fri, 26 Mar 2021 12:40:58 -0700 "Jim Adney" <jadney@vwtype3.org>
wrote:
On Fri, Mar 26, 2021 at 01:46 PM, Chuck Harris wrote:

A 2 type can replace a 1 type. A 2 type is
not recommended to replace a 1 type.
Pretty sure there's a typo in here somewhere.... ;-)





Re: Recapping Tektronix 2465

Jim Adney
 

On Fri, Mar 26, 2021 at 01:46 PM, Chuck Harris wrote:

A 2 type can replace a 1 type. A 2 type is
not recommended to replace a 1 type.
Pretty sure there's a typo in here somewhere.... ;-)


492AP screen dump

Attilio
 

Greetings everyone,
I have a question to ask you: with a Tektronix 492AP spectrum analyzer connected to the PC via the Prologix GP-IB to USB adapter and launching the HP 7470A emulator program on the PC with the appropriate connection configuration settings, it is possible to receive the plot of the 492 AP screen on the PC ?

Thanks for your attention.
-- Cheers
Attilio


FS: Tek 206-0104-00 Straight Tips for 6-32 Probes

Jim Adney
 

I have been looking for a few of the long pointed tips for my P6008 low capacitance probe, but nothing popped up until I found someone on ebay selling them in batches of 20. That's way more than I needed, but the price was right. I'm hoping a few of you out there would like to share in this windfall. They have arrived and are NOS, as advertised. I'm willing to sell as many or as few of these as you want, but postage and handling will make it more economical to buy several, rather than just one. I've posted a photo here:

https://groups.io/g/TekScopes/photo/262268/0

As you can see in the photo, these were military wrapped, each one in a sealed Tek plastic bag, then in a white Tek box, and then in a sealed foil pouch. If you want the whole works, it will cost more to ship. My preference will be to discard the foil pouch, flatten the white Tek box, and leave the tips sealed in the Tek plastic bags. Shipped that way, I figure $5 for packing/shipping, plus $1 per tip would be fair. My 1991 Tek catalog shows these for $1.91 each.


Re: 2440 and 2465B battery/ram replacement

n49ex
 

Not sure how many times I will need to post this on the forum, but here's Hugo Holden"s brilliant do-it-yourself battery/ram replacement with new technology:
http://worldphaco.com/uploads/TEKTRONIX_2465b_OSCILLOSCOPE_CALIBRATION___REPOWERING_THE_DS1225.pdf

And, yes, no matter how it's done, unless one has the means to read the old chip data and program it into the new, you will need to go through the full cal procedure. Probaly a good idea anyway given passage of time....

Reinhard


Re: Recapping Tektronix 2465

Chuck Harris <cfharris@...>
 

Not that I have ever seen. There are some versions of
the manual that have two capacitor numbers swapped on the
parts diagram... But, if you remove the old, and stuff
the new capacitors one at a time, that won't be a problem.

Where there is a problem is in replacing the SMD capacitors
on the late series 2465B's. The polarity of these electrolytics
is not marked in an obvious way in all cases. The capacitor
that is away on the corner of the board is not marked.

-Chuck Harris


On Fri, 26 Mar 2021 14:11:51 -0400 (EDT) "n4buq" <n4buq@knology.net>
wrote:
Thanks for clarifying that, Chuck.

Was there a different model where that was a problem? I seem to
recall the issue but don't recall which model(s) were affected.
Hopefully I'm not crossing up Tek and HP with this...

Barry - N4BUQ

----- Original Message -----
From: "Chuck Harris" <cfharris@erols.com>
To: TekScopes@groups.io
Sent: Friday, March 26, 2021 12:57:40 PM
Subject: Re: [TekScopes] Recapping Tektronix 2465

All of the capacitors on the 2465 supplies have their polarity
markers pointing in the same direction. A few are non-polar
electrolytics, which don't matter.

-Chuck Harris


On Fri, 26 Mar 2021 13:46:03 -0400 (EDT) "n4buq" <n4buq@knology.net>
wrote:
I don't recall exactly to which model(s) this may apply, but I
think one of the 24xx models have the polarity marked incorrectly
on the PC board for one of the filter capacitors. Apologies if I
have this confused with a completely different model/series but I
thought it worthy of mentioning here.

Thanks,
Barry - N4BUQ

----- Original Message -----
From: "Ozan" <ozan_g@erdogan.us>
To: TekScopes@groups.io
Sent: Friday, March 26, 2021 11:37:29 AM
Subject: Re: [TekScopes] Recapping Tektronix 2465

You may already know but at least in some service manuals
component placement diagram shows location of C1132 and C1115
swapped (wrong). This was the case for my 2467B, I assume it
also applies to 2465B. While desoldering take a note of the
original value to make sure. Ozan



iv3ddm

C1132 would be 160V. C1120 can be 100V. C1130 would be
160V. If you want
to use the original values of capacitance, fine. They can be
higher capacitance if you want. C1101 and C1102 would be 25V.
If I put 16V numbers there, it was my mistake. In mine, I
used 16V or 25V types (I do not have mine open at this time)
for the 5V supplies and 35V for the 15V supplies. These I had
in stock along with some other parts. I ordered what I
needed. The 330mfd Mr. Yachad says to use, I did. The kit he
sells is nice. He is exactly
right about the film caps! Replace those! The X1 and Y1 can be
used if you want even higher voltage capacity than the 2
types. In mine, the 1 types are
400-500VAC types. A 2 type can replace a 1 type. A 2 type is
not recommended
to replace a 1 type. The ones Mr. Yachad uses are also an
excellent/ideal choice. If you are on 230-240V mains, the
higher voltage caps are best. If you
have not already done so, go to Mr. Yachad's site about 2465B
recapping. I used that site as a reference do to mine. It
was my first time working on this
model. I did notice in mine the two 39meg resistors (R710 and
R910) on the bottom board were high, 45 and 50meg, and the
100meg on the high voltage board
was 170meg. They are now 40 and 100meg respectively. I could
not get 39meg without a long string of resistors. Mine also
did not have R1010 and R1019 across the NTCs. That was
factory done.

Mark
















Re: Recapping Tektronix 2465

n4buq
 

Thanks for clarifying that, Chuck.

Was there a different model where that was a problem? I seem to recall the issue but don't recall which model(s) were affected. Hopefully I'm not crossing up Tek and HP with this...

Barry - N4BUQ

----- Original Message -----
From: "Chuck Harris" <cfharris@erols.com>
To: TekScopes@groups.io
Sent: Friday, March 26, 2021 12:57:40 PM
Subject: Re: [TekScopes] Recapping Tektronix 2465

All of the capacitors on the 2465 supplies have their polarity
markers pointing in the same direction. A few are non-polar
electrolytics, which don't matter.

-Chuck Harris


On Fri, 26 Mar 2021 13:46:03 -0400 (EDT) "n4buq" <n4buq@knology.net>
wrote:
I don't recall exactly to which model(s) this may apply, but I think
one of the 24xx models have the polarity marked incorrectly on the PC
board for one of the filter capacitors. Apologies if I have this
confused with a completely different model/series but I thought it
worthy of mentioning here.

Thanks,
Barry - N4BUQ

----- Original Message -----
From: "Ozan" <ozan_g@erdogan.us>
To: TekScopes@groups.io
Sent: Friday, March 26, 2021 11:37:29 AM
Subject: Re: [TekScopes] Recapping Tektronix 2465

You may already know but at least in some service manuals component
placement diagram shows location of C1132 and C1115 swapped
(wrong). This was the case for my 2467B, I assume it also applies
to 2465B. While desoldering take a note of the original value to
make sure. Ozan



iv3ddm

C1132 would be 160V. C1120 can be 100V. C1130 would be 160V.
If you want
to use the original values of capacitance, fine. They can be
higher capacitance if you want. C1101 and C1102 would be 25V. If
I put 16V numbers there, it was my mistake. In mine, I used 16V
or 25V types (I do not have mine open at this time) for the 5V
supplies and 35V for the 15V supplies. These I had in stock along
with some other parts. I ordered what I needed. The
330mfd Mr. Yachad says to use, I did. The kit he sells is nice.
He is exactly
right about the film caps! Replace those! The X1 and Y1 can be
used if you want even higher voltage capacity than the 2 types.
In mine, the 1 types are
400-500VAC types. A 2 type can replace a 1 type. A 2 type is not
recommended
to replace a 1 type. The ones Mr. Yachad uses are also an
excellent/ideal choice. If you are on 230-240V mains, the higher
voltage caps are best. If you
have not already done so, go to Mr. Yachad's site about 2465B
recapping. I used that site as a reference do to mine. It was my
first time working on this
model. I did notice in mine the two 39meg resistors (R710 and
R910) on the bottom board were high, 45 and 50meg, and the 100meg
on the high voltage board
was 170meg. They are now 40 and 100meg respectively. I could not
get 39meg without a long string of resistors. Mine also did not
have R1010 and R1019 across the NTCs. That was factory done.

Mark












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