Date   

Re: SG503 question

jeff_a_bowman@outlook.com
 

No dropout 4.5 MHz to 11.5 MHz or 8.78MHz to 26.1MHz but does have a small drop in flatness if knob is turned quickly.
Jeff


Re: FS: Lab Miscellany

 

Hi Liam, could you please get in touch off-list, thanks.

On Sat, Jul 31, 2021 at 9:47 PM Liam Perkins <hifi@telus.net> wrote:

In need of a new home are:

1 - Tek 7B80 timebase (w/o Opt 2) $US35.00
https://w140.com/tekwiki/wiki/7B80

1 - Accessories for the Tek 172 Programmable Test Fixture
for the 576. https://w140.com/tekwiki/wiki/172
$US100.00

FS sale as a lot only:
5 - Programming cards PN - 016-0198-00,
50 - Programming pins PN - 214-1633-00,
1 - BJT/FET Test adapter PN - 013-0098-02
https://tinyurl.com/5mxfzy4p
Manual - https://tinyurl.com/wzemkrwy,
1 - Tek original, hardcopy Op/Serv manual for the 172
PN - 070-1170-01.

1 - Tek original, hardcopy Op/Serv manual for the AF501
Bandpass Filter.
PN - 070-1770-01
https://w140.com/tekwiki/wiki/AF501
$US25.00

1 - Tek original, hardcopy Op/Serv manual for the DM501A
4 1/2-digit DMM.
PN - 070-2749-00
https://w140.com/tekwiki/wiki/DM501
$25.00

1 - Tek original, hardcopy Serv ONLY manual for the R7903.
PN 070-1464-00
https://w140.com/tekwiki/wiki/R7903
$US40.00

1 - Tek original, hardcopy Op/Serv manual for the later model
570 Tube-characteristic Curve Tracer, sourced from a Tek
service center in Illinois.
PN - 070-359
https://w140.com/tekwiki/wiki/570
$US150.00

1 - Tex original, hardcopy Op/Serv manual of the P6021 Current
Probe and Termination. Folded paper, stapled spine, no blue
covers or Cerlox binding.
PN - 010-0237-02
https://w140.com/tekwiki/wiki/P6021
$US15.00

1 - Set of ESI Kelvin Clips PN - 8309 but with their Model
KK-110 silver plated spade lug break out w/shield lug.
See pg. 10 of their catalogue here:
https://tinyurl.com/2bw98m6t
$US20.00

1 - HP ISA GPIB card. PN etched on the board E2073-66501 and on
a sticker on the board PN E2073-66501-3643-02-199920-00963
$US20.00

Prices do not include shipping
Unless you want tracking, I ship at the lowest airmail cost.

PayPal payment is fine and Interac is preferred for Canadian customers.

All goods ship from Calgary, AB, Canada

Liam @ PEARL, Inc.





Re: Tek 485 Vertical Compression during Position Change

Ozan
 

On Sat, Jul 31, 2021 at 02:36 PM, Bob Koller wrote:


I have a 485 that exhibits vertical compression with vertical position change.
For example, if a 4 division square wave is displayed center screen, when
positioned to top or bottom screen the 4 division signal becomes 3.8 div.
This occurs either Ch1 or Ch2. The compression is apparent after U620 in the
vertical amp, but not before at the output of the delay line. Replacement of
U620 and U650 had no effect. I don't have a U660 to substitute.
Voltage measurements at these devices and the supply are close to those
indicated on the schematic.

Any thoughts or previous experience?

Thanks,
------

Michael's suggestion of dirty beam finder switch is very likely. Network around beam finder switch sets the tail current(s) of U620 input pair. Nominal is 20mA so you should see ~ 2V across R603 and R604. Voltage at the bottom of R601 should be 5V in normal operation. If somehow the switch is dirty or if there is some other issue that limits the tail current you will see compression.

Ozan


Re: Tek 485 Vertical Compression during Position Change

Tom Lee
 

Even though you've checked voltages,  you may have missed one or two. I'd double-check the common-mode voltages along the signal path leading up to U620. In particular, observe those voltages as you vary position.

Cheers
Tom

--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford University
Stanford, CA 94305-4070
http://www-smirc.stanford.edu

On 7/31/2021 14:36, Bob Koller wrote:
I have a 485 that exhibits vertical compression with vertical position change. For example, if a 4 division square wave is displayed center screen, when positioned to top or bottom screen the 4 division signal becomes 3.8 div.
This occurs either Ch1 or Ch2. The compression is apparent after U620 in the vertical amp, but not before at the output of the delay line. Replacement of U620 and U650 had no effect. I don't have a U660 to substitute.
Voltage measurements at these devices and the supply are close to those indicated on the schematic.

Any thoughts or previous experience?

Thanks,




Re: Tek 485 Vertical Compression during Position Change

Michael W. Lynch
 

I seem to recall that my 485 had a dirty Beam finder switch. On my machine, any vertical signal trace would be reasonably correct on CRT center and compress as the trace was positioned toward the top or bottom of the CRT screen. Cleaned that beam finder switch and the issue went away.

--
Michael Lynch
Dardanelle, AR


Re: Tek 485 Vertical Compression during Position Change

Zentronics42@...
 

This is ringing a very dim bell. I have not been in a 485 cal document in a while but I just finished up a 465b. I beleave there is an adjustment for this I would check the verticual cal procedure just a read through If I recall correct which is most likely not This is a capacitive adjustment in the vertical amp. But if it is 1 & 2 that leads me to amp board not attenuators.

Zen

-----Original Message-----
From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of Bob Koller
Sent: Saturday, July 31, 2021 5:37 PM
To: TekScopes@groups.io
Subject: [TekScopes] Tek 485 Vertical Compression during Position Change

I have a 485 that exhibits vertical compression with vertical position change. For example, if a 4 division square wave is displayed center screen, when positioned to top or bottom screen the 4 division signal becomes 3.8 div.
This occurs either Ch1 or Ch2. The compression is apparent after U620 in the vertical amp, but not before at the output of the delay line. Replacement of U620 and U650 had no effect. I don't have a U660 to substitute.
Voltage measurements at these devices and the supply are close to those indicated on the schematic.

Any thoughts or previous experience?

Thanks,


Tek 485 Vertical Compression during Position Change

 

I have a 485 that exhibits vertical compression with vertical position change. For example, if a 4 division square wave is displayed center screen, when positioned to top or bottom screen the 4 division signal becomes 3.8 div.
This occurs either Ch1 or Ch2. The compression is apparent after U620 in the vertical amp, but not before at the output of the delay line. Replacement of U620 and U650 had no effect. I don't have a U660 to substitute.
Voltage measurements at these devices and the supply are close to those indicated on the schematic.

Any thoughts or previous experience?

Thanks,


FS: Lab Miscellany

Liam Perkins
 

In need of a new home are:

1 - Tek 7B80 timebase (w/o Opt 2) $US35.00
https://w140.com/tekwiki/wiki/7B80

1 - Accessories for the Tek 172 Programmable Test Fixture
for the 576. https://w140.com/tekwiki/wiki/172
$US100.00

FS sale as a lot only:
5 - Programming cards PN - 016-0198-00,
50 - Programming pins PN - 214-1633-00,
1 - BJT/FET Test adapter PN - 013-0098-02
https://tinyurl.com/5mxfzy4p
Manual - https://tinyurl.com/wzemkrwy,
1 - Tek original, hardcopy Op/Serv manual for the 172
PN - 070-1170-01.

1 - Tek original, hardcopy Op/Serv manual for the AF501
Bandpass Filter.
PN - 070-1770-01
https://w140.com/tekwiki/wiki/AF501
$US25.00

1 - Tek original, hardcopy Op/Serv manual for the DM501A
4 1/2-digit DMM.
PN - 070-2749-00
https://w140.com/tekwiki/wiki/DM501
$25.00

1 - Tek original, hardcopy Serv ONLY manual for the R7903.
PN 070-1464-00
https://w140.com/tekwiki/wiki/R7903
$US40.00

1 - Tek original, hardcopy Op/Serv manual for the later model
570 Tube-characteristic Curve Tracer, sourced from a Tek
service center in Illinois.
PN - 070-359
https://w140.com/tekwiki/wiki/570
$US150.00

1 - Tex original, hardcopy Op/Serv manual of the P6021 Current
Probe and Termination. Folded paper, stapled spine, no blue
covers or Cerlox binding.
PN - 010-0237-02
https://w140.com/tekwiki/wiki/P6021
$US15.00

1 - Set of ESI Kelvin Clips PN - 8309 but with their Model
KK-110 silver plated spade lug break out w/shield lug.
See pg. 10 of their catalogue here:
https://tinyurl.com/2bw98m6t
$US20.00

1 - HP ISA GPIB card. PN etched on the board E2073-66501 and on
a sticker on the board PN E2073-66501-3643-02-199920-00963
$US20.00

Prices do not include shipping
Unless you want tracking, I ship at the lowest airmail cost.

PayPal payment is fine and Interac is preferred for Canadian customers.

All goods ship from Calgary, AB, Canada

Liam @ PEARL, Inc.


Re: Tek Scopes found in old picture book

 

On Tue, Jul 27, 2021 at 06:59 PM, Raymond Domp Frank wrote:
Manchester (Baby or Mark I) fits the bill:
- UK (mains sockets)
- Modules (with big, vertical cans, orientation), see photographs on-line
- Williams Tube (memory, also visible in photographs on the web)
- Restoration project (age and looks of instrumentation and two guys working
on it)
Thanks! The 1990s project was to build a replica of the Manchester Baby, aka Small Scale Experimental Machine or SSEM (the worlds first electronic stored program computer). Try search for 'SSEM Manchester replica'. It is now working and on display at the Manchester Science and Industry Museum:
https://collection.sciencemuseumgroup.org.uk/objects/co8418186/replica-of-the-baby-or-ssem-computer-valve-computer

The rebuild was covered in a series of articles in Resurrection magazine:
https://www.computerconservationsociety.org/resurrection.htm

Regards,
John


Re: OT seeking "manual" for Radio Shack Micronta 22-165 DMM

Gordon Smith
 

Hi Ken,
You can purchase the service manual if that helps. Link: https://www.ebay.com/itm/144087679860?hash=item218c4b8374:g:ESsAAOSwspBg1K6d

Gordon

On Fri, Jul 30, 2021 at 11:57 AM, ken chalfant wrote:


Greetings,

I have searched the internet and all the manual providers I could think of
without any luck.

I went to use my little Radio Shack (Micronta) 22-165 DMM on AC line and was
certain it would be just fine at 120 VAC, and it was - but I really wanted to
check it’s specs.

I’m pretty good at keeping all my manuals and knowing where they are, but I
failed this time. The little manual was not where it should be and nowhere
else to be found.

Does anyone have a user's manual for this little meter they would kindly scan
to PDF and share with me?

Thanks for use of our bandwidth and your consideration.

Regards,

Ken


Re: OT seeking "manual" for Radio Shack Micronta 22-165 DMM

Jim Ford
 

Ken, I have a model 22-220A, with the schematic in the manual.  I can shoot you a photo via private message if you like.       Jim Ford in Southern California Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------From: Ken Eckert <eckertkp@gmail.com> Date: 7/30/21 2:44 PM (GMT-08:00) To: TekScopes@groups.io Subject: Re: [TekScopes] OT seeking "manual" for Radio Shack Micronta 22-165 DMM This Google description says there are schematics:https://www.radiomuseum.org/r/radio_shac_autoranging_multimeter_mi.htmlhttps://www.radiomuseum.org/r/radio_shac_autoranging_multimeter_mi.html?language_id=3On Fri, Jul 30, 2021 at 11:57 AM ken chalfant <kpchalfant@msn.com> wrote:> Greetings,>> I have searched the internet and all the manual providers I could think of> without any luck.>> I went to use my little Radio Shack (Micronta) 22-165 DMM on AC line and> was certain it would be just fine at 120 VAC, and it was - but I really> wanted to check it’s specs.>> I’m pretty good at keeping all my manuals and knowing where they are, but> I failed this time.  The little manual was not where it should be and> nowhere else to be found.>> Does anyone have a user's manual for this little meter they would kindly> scan to PDF and share with me?>> Thanks for use of our bandwidth and your consideration.>> Regards,>> Ken>>> >>>


Re: OT seeking "manual" for Radio Shack Micronta 22-165 DMM

Ken Eckert
 

On Fri, Jul 30, 2021 at 11:57 AM ken chalfant <kpchalfant@msn.com> wrote:

Greetings,

I have searched the internet and all the manual providers I could think of
without any luck.

I went to use my little Radio Shack (Micronta) 22-165 DMM on AC line and
was certain it would be just fine at 120 VAC, and it was - but I really
wanted to check it’s specs.

I’m pretty good at keeping all my manuals and knowing where they are, but
I failed this time. The little manual was not where it should be and
nowhere else to be found.

Does anyone have a user's manual for this little meter they would kindly
scan to PDF and share with me?

Thanks for use of our bandwidth and your consideration.

Regards,

Ken






Re: What was 156-0102-00 used in?

 

On Fri, Jul 30, 2021 at 07:27 PM, Dave Wise wrote:


So they were actually used! All these years I have misunderstood what the
STATUS column means in the Common Design Parts Catalog. So “DL” (Deleted)
is both parts that never got into a product *and* parts used in
long-discontinued products… do I have it right?
About the status code my version of Common Design Catalog says it means:
"An item that is no longer produced or purchased and which has no replacement".
It doesn't say if it was ever used or not.

And I was so close. I pored over parts lists for the 4025, 4023, 4014, 4006,
and T4002, but did not try the 4002A.
I checked the P/N's again because there was also a circuit board P/N listed using
these P/N's which I assumed was for 4002A but it turned out it (670-1449-00)
was for T4002 B050000 & above so I have to revise my previous reply.

/Håkan


Re: Discord server for Tek & HPAK lists

Randy Newman
 

Sounds great. I am already on Discord, so will add this one in.
Thanks!
Randy.


Ps....once I have time, will post some pics of my 7633 with now non-working
horizontal.

On Wed, Jul 28, 2021, 3:37 PM cheater cheater <cheater00social@gmail.com>
wrote:

Hi all,
since a few people voiced interest in this, I set up a Discord server
for the Tek and HPAK lists. Before joining please read the below.

Discord is a free program (with a paid tier as well which you don't
need) that allows you to chat in real time using text chat, images and
file attachments, as well as voice chat and real-time screen-sharing
video streams. It works on computers as well as on mobile phones
(computers). Each community has its own server (you can also say each
community has "a discord" or "a guild"). Each server contains several
separate text channels which contain logs of past conversations. The
channels are usually dedicated to one topic each.

There's a few things to mention.

1. This does not replace either list. It's not "official" in any way.
Moderators of the Tek and HPAK lists are not moderators on the Discord
(as of now).

2. There are channels for HPAK and Tek as well as other topical
channels and an off-topic "general" channel. There's a channel for
"other testing equipment" as well as a general electronics channel.
Other channels can be added by me if there's ever a need, it's not
really limited. If you see a need let me know.

3. This is meant for real-time chat as well as general chat, getting
to know each other more on a personal level, checking in on each other
if anyone is in bad health, talking in real time when trying to work
out technical issues, do presentations, video streams, etc. You can
put Discord on your smart phone and beam out its camera to other users
in real time to show them around your collection or a circuit, and
that's very useful.

4. The rules are described when you first join the server and you have
to accept them to be able to take part. Some channels have extra rules
in the topic. I will make up other rules as I go. I will likely
arbitrate things that are not described in the rules and might decide
in contradiction to the rules. I will probably bring in others to help
at some point. Anyone who doesn't like the rules can leave. The rules
will be different than on the mailing lists. Anyone who acts badly
will be made to kneel on vintage NOS tunnel diodes for 6 hours right
after being flogged with 900mm triax cables. This is not an invitation
to act badly (you know who you are). I would love to say that everyone
is welcome but obviously some people will find ways to make themselves
unwelcome, don't be that guy.

5. Please use the same name / user ID as on the mailing lists, so we
know who's who - it'll make things much easier. Please use general
sense and always prefer to keep a friendly (not just civil, but
explicitly friendly) conversation rather than a "technically anally
correct" or "i am logically more in the right" conversation. Point 4
applies. Don't spam, don't flood, try not to use enter as punctuation,
don't post walls of text.

You can join the server using the following link, which will expire in
7 days. This is to prevent spam bots from joining. If you want to join
past those 7 days, email me off list and I'll send you a new link.

It's best of you first install the Discord desktop application on your
computer or phone, and then enter the link there by copy-pasting or
typing it in. You can also use Discord from the browser, but that's
less optimal, because you won't be able to know if someone's talking
to you when you don't have the Discord tab open, and Discord is
primarily about immediate contact, which is then lost.

https://discord.gg/vPds5Dgt

Enjoy






OT seeking "manual" for Radio Shack Micronta 22-165 DMM

ken chalfant
 

Greetings,

I have searched the internet and all the manual providers I could think of without any luck.

I went to use my little Radio Shack (Micronta) 22-165 DMM on AC line and was certain it would be just fine at 120 VAC, and it was - but I really wanted to check it’s specs.

I’m pretty good at keeping all my manuals and knowing where they are, but I failed this time. The little manual was not where it should be and nowhere else to be found.

Does anyone have a user's manual for this little meter they would kindly scan to PDF and share with me?

Thanks for use of our bandwidth and your consideration.

Regards,

Ken


Re: What was 156-0102-00 used in?

Dave Wise
 

Thank you, Håkan - you are an encyclopedic asset to this group.

So they were actually used! All these years I have misunderstood what the STATUS column means in the Common Design Parts Catalog. So “DL” (Deleted) is both parts that never got into a product *and* parts used in long-discontinued products… do I have it right?

Dave Wise
Information Display, Terminals & Displays, 1980-1995

And I was so close. I pored over parts lists for the 4025, 4023, 4014, 4006, and T4002, but did not try the 4002A. It was before my time and AFAIK I never saw one.
I will go back to the Northwest Vintage Radio Society member who has them, and tell him where they go.

=============================================================================

From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of zenith5106 via groups.io
Sent: Friday, July 30, 2021 10:15 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] What was 156-0102-00 used in?

On Fri, Jul 30, 2021 at 12:28 AM, Dave Wise wrote:


What instrument used this
All three were used in 4002A only.

/Håkan


Re: What was 156-0102-00 used in?

 

On Fri, Jul 30, 2021 at 12:28 AM, Dave Wise wrote:


What instrument used this
All three were used in 4002A only.

/Håkan


Re: Tek 545A Scope

David Kuhn
 

Thank you!

On Fri, Jul 30, 2021 at 12:23 PM Dave Wise <david_wise@phoenix.com> wrote:

David Kuhn, I read that your Type D plugin has bad shock mounts. I have
found a source for new rubber cushions indistinguishable from new
originals. Notes below:

ACTION: Buy "DJI ZH3-3D Damping Rubber Set (Part 42)", $5.19 at ebay.
This is four bags of four each of four different type isolators.
The ball shaped ones (gray "A40" and white "30")
are *perfect* drop-in replacements.

FIXED!

NOTE: "DJI Z15 Zenmuse Spare Part 7 Damping Rubber for gimbal gyroscope"
at aliexpress is probably okay too. 6 parts $8.
"DJI Zenmuse H4-3D Part 3 Damping Rubber" looks identical to H3-3D
part 42.
"DJI Zenmuse H3 2d Damping Rubber Part 15" at 3rdrockhobbies is
twelve cushions (3 kinds, all ball type) for $5.
These look exactly like Barry Controls 275-N1 which are ~$10 each.
Parts for Phantom series are no good.
I don't think there ever was an H2.






Re: What is a "H" plugin?

Dave Wise
 

I have discovered a source for the rubber cushions / shock mounts. Notes below:

ACTION: Buy "DJI ZH3-3D Damping Rubber Set (Part 42)", $5.19 at ebay.
This is four bags of four each of four different type isolators.
The ball shaped ones (gray "A40" and white "30")
are *perfect* drop-in replacements.

FIXED!

NOTE: "DJI Z15 Zenmuse Spare Part 7 Damping Rubber for gimbal gyroscope"
at aliexpress is probably okay too. 6 parts $8.
"DJI Zenmuse H4-3D Part 3 Damping Rubber" looks identical to H3-3D part 42.
"DJI Zenmuse H3 2d Damping Rubber Part 15" at 3rdrockhobbies is
twelve cushions (3 kinds, all ball type) for $5.
These look exactly like Barry Controls 275-N1 which are ~$10 each.
Parts for Phantom series are no good.
I don't think there ever was an H2.


Re: Repair question for Type D High-Gain Differential plug-in

Dave Wise
 

Daniel Koller, those tubes were selected and matched for grid bias at a given cathode current, and gain. The specs are in the "157" document in the Replaceable Parts Registry at w140.com . Just search for RPR.
You may have to build a test jig like Tek's.

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