Date   
Tektronix 531A

Brenda
 

Hello everyone! I have purchased a Tektronix 531A from the evil eBay site, and needless to say, the scope has suffered some serious misshape due to the sellers packing skills. The scope arrived with the CRT totally obliterated. I have spent 4 hours with a vacuum cleaner and trying to keep the broken glass contained and I have a beautiful border collie bluetick coonhound mix from any injuries. It arrived with some bubble wrap and packing peanuts but as soon as I picked it up out of the box, I ended up with about 9 pieces of glass in my hand. let me tell ya, that hurts quite a bit. Anyways, I am here wondering if anyone on here may have a CRT for the 531A and the 533A as my 533A needs one as well (screen is really burned in). Please let me know if you may have 1 or 2, I would certainly be interested in them. Other than for the obliterated CRT and 6080 losing vacuum, this scope should work. Seems like it has been well taken care of, so clean inside with very little dust on the HV section.

Thanks so much!!
Brenda

Re: Tektronix 7A16A Low Bandwidth Issue

Bruce Atwood
 

Sounds like there could be a problem with the bandwidth limit switch or
circuit.

On 12/19/2019 1:15 PM, kdlamet@... wrote:
First I come here a lot for the great info, but seldom if ever post. I recently picked up a non-working 7904 from eBay and was able to repair the 670-1613-00 HV board. After getting it working I began collecting and repairing Plugins.

I had pretty good success until running into a 7A26 and now this 7A16A.

The issue: everything passed cal until the bandwidth section. Using an SG503, 012-0408-00 cable and 50 ohm terminator into the 7A16A set to 10mV input range and 6 division input, it drops to less than 1div around 50 Mhz. 4.2 division occurs at ~ 28 Mhz. The SG503 and cable are working as I get good response from my 2465A.

Initially the 7A16A had bad contact on all ranges of input - cleaned ONLY with 99% IPA. Also input BNC connector had an intermittent ground - internal to the connector. This was replaced with a 7A26 donor part.
It appears to be in the Attenuator section as I see the loss of bandwidth at the output prior to going to the main amplifier board.

Any assistance/info/guidance on this issue would be Greatly appreciated.

Thanks in advance.

P.S. A little background.... 40+ years Electronic Technician - Private industry / DOD. No Engineering. I've fixed it all Radios/TV/Auto Stereo/RADAR/Test Equipment(PMEL).

-Dave



.
--
Bruce Atwood PhD
Department of Astronomy
The Ohio State University
100 West 18th Ave., Room 4055
Columbus, OH 43210

Phone 614.314.0189
FAX 614.292.2928

Re: Tektronix 7A16A Low Bandwidth Issue

Eric
 

Have you tried a calibration from the service manual. I know when I started
out my missing bandwidth was in the high frequency compensation of the plug
in. It is a really finicky calibration and you need a really fast edge
squair wave. Usually from a tunnel diode pulser. For over 1 ns rise time a
106 or a pg506 will work but that is just good enough for a 7a26. their
rise times are 1nS, faster than that and you are in to the world of tunnel
doides.

On Thu, Dec 19, 2019, 2:35 PM <kdlamet@...> wrote:

Correction: cable number is 012-0482-00.



FS: NOS Tektronix repair parts

Arthur Elsenaar <sub@...>
 

Hi,
I am new to this list just to let you Tek enthusiasts know that I digged up a batch of new old stock Tektronix repair parts. Quantities vary from just a few to hundreds or thousands of some. This is the full list of all I have. I could sell them off individually or if someone is interested in the bulk, let me know. I took photo's of the parts in case you want to have a look. Please note that this is not a commercial operation for me, just a service and for me to part with the parts that I have no need for.

Contact me **off-list** at sub at artelse dot com if you are interested.
Thanks, Arthur.

Tektronix parts list:
108-0407-00
120-0366-00
131-3107-00
136-0352-00
150-0130-00
151-0169-00
151-0198-00
151-0199-00
151-0220-03
151-0280-00
151-0415-00
151-0437-00
151-0444-00
151-0469-00
151-0719-00
152-0502-00
153-0547-00
156-0317-00
156-0763-00
156-1809-01
210-1134-00
260-1313-00
281-0508-00
281-0525-00
281-0543-00
281-0578-00
281-0634-00
283-0648-00
285-0633-00
311-0310-00
311-1719-00

Re: Caps

Jamie Ostrowski
 

MY TEK 4006 TERMINAL ONLY ALLOWS ME TO TYPE IN ALL CAPS. SORRY, FELLAS.

:-)

REGARDS,

-JAMIE

On Thu, Dec 19, 2019 at 5:15 PM Greg Muir via Groups.Io <big_sky_explorer=
yahoo.com@groups.io> wrote:

Ever have any experience dealing with email on the pre-Internet ARPNET?
Used Unix “vi” for all emails and replies came in from other agencies
frequently in caps as if the writers didn’t understand that they had a caps
lock on their keyboard.

Greg



Re: Caps

Greg Muir
 

Ever have any experience dealing with email on the pre-Internet ARPNET? Used Unix “vi” for all emails and replies came in from other agencies frequently in caps as if the writers didn’t understand that they had a caps lock on their keyboard.

Greg

Re: Caps

Abc Xyz
 

Years ago when I started using eMail and/or Text, I used All Caps. I found
it easier to Use and easier to Read on the Computer, until one day someone
said 'why are you Yelling at me!?'. I hadn't a Clue what they were talking
about.
I wasn't Yelling. Just exercising my Preference. I never meant any
Disrespect nor Intended any. Some people get so Offended over the most
Trivial Preferences of others...Sad.
PS: you'll Notice my Preference in Capitalizing Words...I have my Reasons
:)

On Thu, Dec 19, 2019, 1:44 PM Richard R. Pope <mechanic_2@...>
wrote:

Dennis,
I started on private BBSs with the Vic-20 in the early 1980s. I
then signed up for Internet access when you had to use Compuserve or
AOL. So I have also been involved with email for a very long time. We
always considered all Caps as being rude and inconsiderate behavior. It
was considered the same as screaming and yelling at someone. I also use
capitalization as a way to help something to stand out but I don't
completely capitalize a group of words or an entire sentence. I
capitalize proper names and words unless I don't have any respect for a
certain person or organization.
I would consider your suggestion below as being appropriate. Yes,
there are people who are responding on list when it should be taken off
list. Teaching the young the appropriate manner in which to behave is an
endless job. Something else that I would add in there is along the line
of. Please quote the complete offering so that we can follow the
transaction. So it would be "If you are interested in my offer contact
me directly, OFF-LIST, at dennis at ridesoft dot com. Please quote the
complete offer."
so forth and so on.
I appreciate the insight and help in this matter.
GOD Bless and Thanks,
rich!
BTW: Merry Christmas, all!

On 12/19/2019 2:56 PM, Dennis Tillman W7PF wrote:
Hi Richard,
I've been using email since 1980 when I was part of a development team
that designed the second email system in the USA. The first one was COMET
and it was developed by a team in the US government for transmitting time
sensitive documents to managers provided you got their permission first
before being permitted to send it. We always thought that was an odd way to
design an email system.

Ours was called InforMAIL. In addition to sending email to anyone if you
had their address, it also had one other feature I haven't seen anywhere
else: If you realized you made a mistake by sending an email to someone or
to a group, you could "retrieve" it provided none of the recipients had
read it.

40 years ago email was too new to have any preconceived meaning for when
it might be inappropriate to use capital letters. I use them on many
occasions. For example: where they are appropriate learned to
* I use them to communicate an import idea or detail that might
otherwise be overlooked.
* I frequently use them for proper nouns
* In the early days at Microsoft, where everything seemed to change very
fast, it was a way to indicate this is message was urgent, and not
something that could wait.

Back to you point about capital letters being rude. This was not the
case in the early days of email. I was aware that over time this became a
common interpretation. I'm glad you brought this to my attention because
things have changed and I need to act appropriately going forward.

My concern is that a simple paragraph of its own will be completely
ignored or skipped over by the reader. So I came up with a compromise and I
would like to hear what you think of it. This is an example of what I
propose to send all future sellers:

To the seller I would say:
---------------------------------
In the future please include a short paragraph of its own that people
can't miss. Its purpose is to tell anyone interested in your offer that
they should contact you directly, off-list, at your email address. Spell
out your email address, e.g. dennis at ridesoft dot com. Since TekScopes
posts can be read by the general public this will provide some protection
against SPAM Bots harvesting your address. Here is an example of what your
paragraph might look like:

"If you are interested in my offer contact me directly, OFF-LIST, at
dennis at ridesoft dot com."
---------------------------------

I got rid of all the capital letters except for seven of them: OFF-LIST.

Dennis

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
Richard R. Pope
Sent: Thursday, December 19, 2019 11:35 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] FS: sets of NOS concentric control knobs

Hello all,
Please don't use all caps. It is rude and inconsiderate. Place it
in it's own paragraph!
GOD Bless and Thanks,
rich!

On 12/19/2019 1:12 AM, Dennis Tillman W7PF wrote:
Hi Brad,
In the future please include a line that people can't miss (all
capitals works well) indicating that interested parties should contact you
directly (and provide your contact info). That way we keep unnecessary
personal traffic off TekScopes.

Dennis Tillman W7PF

-----Original Message-----
From: Brad Thompson <brad.thompsonaa1ip@...>
To: TekScopes@groups.io <TekScopes@groups.io>
Cc: HP-Agilent-Keysight-equipment
<HP-Agilent-Keysight-equipment@groups.io>
Sent: Wed, Dec 18, 2019 4:48 pm
Subject: [TekScopes] FS: sets of NOS concentric control knobs

Brad Thompson via Groups.Io wrote on 12/6/2019 10:29 A
Hello--
I'm offering FS sets of NOS concentric control knobs. These have
longitudinally-grooved surfaces and black cursor markings which contrast
nicely with the aluminum knob material.

The top knob has a black insert. Each knob gets secured to its control
shaft by two .050-inch hex setscrews. A .jpg-format photo is available on
request.

Bottom knob: 0.625 inches in diameter, 0.56 inches high, 0.25 inch
through hole Top knob: 0.425 inches in diameter, 0.56 inches high, 0.125
inch blind hole.

(Please note that the knobs are made from aluminum, a conductive
metal, and hence will pose a shock hazard if you're accustomed to the
bad practice of floating the ungrounded chassis of an instrument.)

Each set comprises three top/bottom pairs and as a bonus while the
supply lasts, four skirted plastic knobs with 0.125-inch brass-insert blind
hole and one 0.050-inch setscrew.

I'm asking $10.00 per package (four two-piece knobsets), which
includes USPS first-class mail to U.S. locations.

Questions welcomed, PayPal honored.
Thanks, and 73--

Brad AA1IP









Re: Caps

KeepIt SimpleStupid
 

Gmail has a 30s retreive window available.  See https://smallbusiness.chron.com/can-delay-delivery-gmail-27206.html

Searching said that delay sending is available too.
But changes occur very rapidly, so who knows if it works or not.
Forums that implement PMs or Conversations allow edits for a short time.  They never tell you when the time is up until you try to send the edited email.  It doesn't check to see if the recipient is not accepting messages until you try to send.
You can add people to the conversation or turn that off.
I'd like delayed-send to be normal. 0-15 minutes.If it's within the same domain, you should be able to retrieve until it's read.

On Thursday, December 19, 2019, 5:24:10 PM EST, Chuck Harris <cfharris@...> wrote:

Dennis,

You won't be able to please everyone, some days anyone, so there
isn't much point in even trying.  Do things in a way that your
upbringing tells you is right and makes you happy, and move on.

Today so many people seem to think that any little thing that
bothers them even slightly is an Earth shattering affront, and must
be stomped out.

Don't play their games.

I'd like to hear more about InforMAIL, particularly when, and where?

I started using email in the mid 70's at the University of Maryland.

I was exposed to email first on GE Information Systems international
network, in the early 1970's... A friend's father was one of their
VP's, and we, uhmmm?  Borrowed his account...

-Chuck Harris


Dennis Tillman W7PF wrote:
Hi Richard,
I've been using email since 1980 when I was part of a development team that designed the second email system in the USA. The first one was COMET and it was developed by a team in the US government for transmitting time sensitive documents to managers provided you got their permission first before being permitted to send it. We always thought that was an odd way to design an email system.

Ours was called InforMAIL. In addition to sending email to anyone if you had their address, it also had one other feature I haven't seen anywhere else: If you realized you made a mistake by sending an email to someone or to a group, you could "retrieve" it provided none of the recipients had read it.

40 years ago email was too new to have any preconceived meaning for when it might be inappropriate to use capital letters. I use them on many occasions. For example:  where they are appropriate learned to
* I use them to communicate an import idea or detail that might otherwise be overlooked.
* I frequently use them for proper nouns
* In the early days at Microsoft, where everything seemed to change very fast, it was a way to indicate this is message was urgent, and not something that could wait.

Back to you point about capital letters being rude. This was not the case in the early days of email. I was aware that over time this became a common interpretation. I'm glad you brought this to my attention because things have changed and I need to act appropriately going forward.

My concern is that a simple paragraph of its own will be completely ignored or skipped over by the reader. So I came up with a compromise and I would like to hear what you think of it. This is an example of what I propose to send all future sellers:

Re: Caps

Chuck Harris
 

Dennis,

You won't be able to please everyone, some days anyone, so there
isn't much point in even trying. Do things in a way that your
upbringing tells you is right and makes you happy, and move on.

Today so many people seem to think that any little thing that
bothers them even slightly is an Earth shattering affront, and must
be stomped out.

Don't play their games.

I'd like to hear more about InforMAIL, particularly when, and where?

I started using email in the mid 70's at the University of Maryland.

I was exposed to email first on GE Information Systems international
network, in the early 1970's... A friend's father was one of their
VP's, and we, uhmmm? Borrowed his account...

-Chuck Harris


Dennis Tillman W7PF wrote:

Hi Richard,
I've been using email since 1980 when I was part of a development team that designed the second email system in the USA. The first one was COMET and it was developed by a team in the US government for transmitting time sensitive documents to managers provided you got their permission first before being permitted to send it. We always thought that was an odd way to design an email system.

Ours was called InforMAIL. In addition to sending email to anyone if you had their address, it also had one other feature I haven't seen anywhere else: If you realized you made a mistake by sending an email to someone or to a group, you could "retrieve" it provided none of the recipients had read it.

40 years ago email was too new to have any preconceived meaning for when it might be inappropriate to use capital letters. I use them on many occasions. For example: where they are appropriate learned to
* I use them to communicate an import idea or detail that might otherwise be overlooked.
* I frequently use them for proper nouns
* In the early days at Microsoft, where everything seemed to change very fast, it was a way to indicate this is message was urgent, and not something that could wait.

Back to you point about capital letters being rude. This was not the case in the early days of email. I was aware that over time this became a common interpretation. I'm glad you brought this to my attention because things have changed and I need to act appropriately going forward.

My concern is that a simple paragraph of its own will be completely ignored or skipped over by the reader. So I came up with a compromise and I would like to hear what you think of it. This is an example of what I propose to send all future sellers:

Re: Caps

Carsten Bormann
 

On Dec 19, 2019, at 21:56, Dennis Tillman W7PF <@Dennis_Tillman_W7pF> wrote:

"If you are interested in my offer contact me directly, OFF-LIST, at dennis at ridesoft dot com."
This is no longer rude, says my calibrated e-mail rudeness meter. Thanks.

It still relies on people understanding the term “OFF-LIST” — why do you think that is a given?
(Those people who understand it are more likely to do it already, anyway.)

Grüße, Carsten

Re: Caps

Richard R. Pope
 

Dennis,
I started on private BBSs with the Vic-20 in the early 1980s. I then signed up for Internet access when you had to use Compuserve or AOL. So I have also been involved with email for a very long time. We always considered all Caps as being rude and inconsiderate behavior. It was considered the same as screaming and yelling at someone. I also use capitalization as a way to help something to stand out but I don't completely capitalize a group of words or an entire sentence. I capitalize proper names and words unless I don't have any respect for a certain person or organization.
I would consider your suggestion below as being appropriate. Yes, there are people who are responding on list when it should be taken off list. Teaching the young the appropriate manner in which to behave is an endless job. Something else that I would add in there is along the line of. Please quote the complete offering so that we can follow the transaction. So it would be "If you are interested in my offer contact me directly, OFF-LIST, at dennis at ridesoft dot com. Please quote the complete offer."
so forth and so on.
I appreciate the insight and help in this matter.
GOD Bless and Thanks,
rich!
BTW: Merry Christmas, all!

On 12/19/2019 2:56 PM, Dennis Tillman W7PF wrote:
Hi Richard,
I've been using email since 1980 when I was part of a development team that designed the second email system in the USA. The first one was COMET and it was developed by a team in the US government for transmitting time sensitive documents to managers provided you got their permission first before being permitted to send it. We always thought that was an odd way to design an email system.

Ours was called InforMAIL. In addition to sending email to anyone if you had their address, it also had one other feature I haven't seen anywhere else: If you realized you made a mistake by sending an email to someone or to a group, you could "retrieve" it provided none of the recipients had read it.

40 years ago email was too new to have any preconceived meaning for when it might be inappropriate to use capital letters. I use them on many occasions. For example: where they are appropriate learned to
* I use them to communicate an import idea or detail that might otherwise be overlooked.
* I frequently use them for proper nouns
* In the early days at Microsoft, where everything seemed to change very fast, it was a way to indicate this is message was urgent, and not something that could wait.

Back to you point about capital letters being rude. This was not the case in the early days of email. I was aware that over time this became a common interpretation. I'm glad you brought this to my attention because things have changed and I need to act appropriately going forward.

My concern is that a simple paragraph of its own will be completely ignored or skipped over by the reader. So I came up with a compromise and I would like to hear what you think of it. This is an example of what I propose to send all future sellers:

To the seller I would say:
---------------------------------
In the future please include a short paragraph of its own that people can't miss. Its purpose is to tell anyone interested in your offer that they should contact you directly, off-list, at your email address. Spell out your email address, e.g. dennis at ridesoft dot com. Since TekScopes posts can be read by the general public this will provide some protection against SPAM Bots harvesting your address. Here is an example of what your paragraph might look like:

"If you are interested in my offer contact me directly, OFF-LIST, at dennis at ridesoft dot com."
---------------------------------

I got rid of all the capital letters except for seven of them: OFF-LIST.

Dennis

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Richard R. Pope
Sent: Thursday, December 19, 2019 11:35 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] FS: sets of NOS concentric control knobs

Hello all,
Please don't use all caps. It is rude and inconsiderate. Place it in it's own paragraph!
GOD Bless and Thanks,
rich!

On 12/19/2019 1:12 AM, Dennis Tillman W7PF wrote:
Hi Brad,
In the future please include a line that people can't miss (all capitals works well) indicating that interested parties should contact you directly (and provide your contact info). That way we keep unnecessary personal traffic off TekScopes.

Dennis Tillman W7PF

-----Original Message-----
From: Brad Thompson <brad.thompsonaa1ip@...>
To: TekScopes@groups.io <TekScopes@groups.io>
Cc: HP-Agilent-Keysight-equipment
<HP-Agilent-Keysight-equipment@groups.io>
Sent: Wed, Dec 18, 2019 4:48 pm
Subject: [TekScopes] FS: sets of NOS concentric control knobs

Brad Thompson via Groups.Io wrote on 12/6/2019 10:29 A
Hello--
I'm offering FS sets of NOS concentric control knobs. These have longitudinally-grooved surfaces and black cursor markings which contrast nicely with the aluminum knob material.

The top knob has a black insert. Each knob gets secured to its control shaft by two .050-inch hex setscrews. A .jpg-format photo is available on request.

Bottom knob: 0.625 inches in diameter, 0.56 inches high, 0.25 inch through hole Top knob: 0.425 inches in diameter, 0.56 inches high, 0.125 inch blind hole.

(Please note that the knobs are made from aluminum, a conductive
metal, and hence will pose a shock hazard if you're accustomed to the
bad practice of floating the ungrounded chassis of an instrument.)

Each set comprises three top/bottom pairs and as a bonus while the supply lasts, four skirted plastic knobs with 0.125-inch brass-insert blind hole and one 0.050-inch setscrew.

I'm asking $10.00 per package (four two-piece knobsets), which includes USPS first-class mail to U.S. locations.

Questions welcomed, PayPal honored.
Thanks, and 73--

Brad AA1IP






Caps

 

Hi Richard,
I've been using email since 1980 when I was part of a development team that designed the second email system in the USA. The first one was COMET and it was developed by a team in the US government for transmitting time sensitive documents to managers provided you got their permission first before being permitted to send it. We always thought that was an odd way to design an email system.

Ours was called InforMAIL. In addition to sending email to anyone if you had their address, it also had one other feature I haven't seen anywhere else: If you realized you made a mistake by sending an email to someone or to a group, you could "retrieve" it provided none of the recipients had read it.

40 years ago email was too new to have any preconceived meaning for when it might be inappropriate to use capital letters. I use them on many occasions. For example: where they are appropriate learned to
* I use them to communicate an import idea or detail that might otherwise be overlooked.
* I frequently use them for proper nouns
* In the early days at Microsoft, where everything seemed to change very fast, it was a way to indicate this is message was urgent, and not something that could wait.

Back to you point about capital letters being rude. This was not the case in the early days of email. I was aware that over time this became a common interpretation. I'm glad you brought this to my attention because things have changed and I need to act appropriately going forward.

My concern is that a simple paragraph of its own will be completely ignored or skipped over by the reader. So I came up with a compromise and I would like to hear what you think of it. This is an example of what I propose to send all future sellers:

To the seller I would say:
---------------------------------
In the future please include a short paragraph of its own that people can't miss. Its purpose is to tell anyone interested in your offer that they should contact you directly, off-list, at your email address. Spell out your email address, e.g. dennis at ridesoft dot com. Since TekScopes posts can be read by the general public this will provide some protection against SPAM Bots harvesting your address. Here is an example of what your paragraph might look like:

"If you are interested in my offer contact me directly, OFF-LIST, at dennis at ridesoft dot com."
---------------------------------

I got rid of all the capital letters except for seven of them: OFF-LIST.

Dennis

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Richard R. Pope
Sent: Thursday, December 19, 2019 11:35 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] FS: sets of NOS concentric control knobs

Hello all,
Please don't use all caps. It is rude and inconsiderate. Place it in it's own paragraph!
GOD Bless and Thanks,
rich!

On 12/19/2019 1:12 AM, Dennis Tillman W7PF wrote:
Hi Brad,
In the future please include a line that people can't miss (all capitals works well) indicating that interested parties should contact you directly (and provide your contact info). That way we keep unnecessary personal traffic off TekScopes.

Dennis Tillman W7PF

-----Original Message-----
From: Brad Thompson <brad.thompsonaa1ip@...>
To: TekScopes@groups.io <TekScopes@groups.io>
Cc: HP-Agilent-Keysight-equipment
<HP-Agilent-Keysight-equipment@groups.io>
Sent: Wed, Dec 18, 2019 4:48 pm
Subject: [TekScopes] FS: sets of NOS concentric control knobs

Brad Thompson via Groups.Io wrote on 12/6/2019 10:29 A
Hello--
I'm offering FS sets of NOS concentric control knobs. These have longitudinally-grooved surfaces and black cursor markings which contrast nicely with the aluminum knob material.

The top knob has a black insert. Each knob gets secured to its control shaft by two .050-inch hex setscrews. A .jpg-format photo is available on request.

Bottom knob: 0.625 inches in diameter, 0.56 inches high, 0.25 inch through hole Top knob: 0.425 inches in diameter, 0.56 inches high, 0.125 inch blind hole.

(Please note that the knobs are made from aluminum, a conductive
metal, and hence will pose a shock hazard if you're accustomed to the
bad practice of floating the ungrounded chassis of an instrument.)

Each set comprises three top/bottom pairs and as a bonus while the supply lasts, four skirted plastic knobs with 0.125-inch brass-insert blind hole and one 0.050-inch setscrew.

I'm asking $10.00 per package (four two-piece knobsets), which includes USPS first-class mail to U.S. locations.

Questions welcomed, PayPal honored.
Thanks, and 73--

Brad AA1IP








--
Dennis Tillman W7PF
TekScopes Moderator

Re: FS: sets of NOS concentric control knobs

ROLYNN PRECHTL K7DFW
 

Please don't use all caps. It is rude and inconsiderate.

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


This is just plain victimhood.


Rolynn P

Re: FS: sets of NOS concentric control knobs

Richard R. Pope
 

Hello all,
Please don't use all caps. It is rude and inconsiderate. Place it in it's own paragraph!
GOD Bless and Thanks,
rich!

On 12/19/2019 1:12 AM, Dennis Tillman W7PF wrote:
Hi Brad,
In the future please include a line that people can't miss (all capitals works well) indicating that interested parties should contact you directly (and provide your contact info). That way we keep unnecessary personal traffic off TekScopes.

Dennis Tillman W7PF

-----Original Message-----
From: Brad Thompson <brad.thompsonaa1ip@...>
To: TekScopes@groups.io <TekScopes@groups.io>
Cc: HP-Agilent-Keysight-equipment <HP-Agilent-Keysight-equipment@groups.io>
Sent: Wed, Dec 18, 2019 4:48 pm
Subject: [TekScopes] FS: sets of NOS concentric control knobs

Brad Thompson via Groups.Io wrote on 12/6/2019 10:29 A
Hello--
I'm offering FS sets of NOS concentric control knobs. These have longitudinally-grooved surfaces and black cursor markings which contrast nicely with the aluminum knob material.

The top knob has a black insert. Each knob gets secured to its control shaft by two .050-inch hex setscrews. A .jpg-format photo is available on request.

Bottom knob: 0.625 inches in diameter, 0.56 inches high, 0.25 inch through hole Top knob: 0.425 inches in diameter, 0.56 inches high, 0.125 inch blind hole.

(Please note that the knobs are made from aluminum, a conductive metal, and hence will pose a shock hazard if you're accustomed to the bad practice of floating the ungrounded chassis of an instrument.)

Each set comprises three top/bottom pairs and as a bonus while the supply lasts, four skirted plastic knobs with 0.125-inch brass-insert blind hole and one 0.050-inch setscrew.

I'm asking $10.00 per package (four two-piece knobsets), which includes USPS first-class mail to U.S. locations.

Questions welcomed, PayPal honored.
Thanks, and 73--

Brad AA1IP



Re: FS: sets of NOS concentric control knobs

 

Hi Brad,
In the future please include a line that people can't miss (all capitals works well) indicating that interested parties should contact you directly (and provide your contact info). That way we keep unnecessary personal traffic off TekScopes.

Dennis Tillman W7PF

-----Original Message-----
From: Brad Thompson <brad.thompsonaa1ip@...>
To: TekScopes@groups.io <TekScopes@groups.io>
Cc: HP-Agilent-Keysight-equipment <HP-Agilent-Keysight-equipment@groups.io>
Sent: Wed, Dec 18, 2019 4:48 pm
Subject: [TekScopes] FS: sets of NOS concentric control knobs

Brad Thompson via Groups.Io wrote on 12/6/2019 10:29 A
Hello--
I'm offering FS sets of NOS concentric control knobs. These have longitudinally-grooved surfaces and black cursor markings which contrast nicely with the aluminum knob material.

The top knob has a black insert. Each knob gets secured to its control shaft by two .050-inch hex setscrews. A .jpg-format photo is available on request.

Bottom knob: 0.625 inches in diameter, 0.56 inches high, 0.25 inch through hole Top knob: 0.425 inches in diameter, 0.56 inches high, 0.125 inch blind hole.

(Please note that the knobs are made from aluminum, a conductive metal, and hence will pose a shock hazard if you're accustomed to the bad practice of floating the ungrounded chassis of an instrument.)

Each set comprises three top/bottom pairs and as a bonus while the supply lasts, four skirted plastic knobs with 0.125-inch brass-insert blind hole and one 0.050-inch setscrew.

I'm asking $10.00 per package (four two-piece knobsets), which includes USPS first-class mail to U.S. locations.

Questions welcomed, PayPal honored.
Thanks, and 73--

Brad AA1IP




--
Dennis Tillman W7PF
TekScopes Moderator

Re: FS: sets of NOS concentric control knobs

Greg
 

Could you please send a photo?  Thank you.

-----Original Message-----
From: Brad Thompson <brad.thompsonaa1ip@...>
To: TekScopes@groups.io <TekScopes@groups.io>
Cc: HP-Agilent-Keysight-equipment <HP-Agilent-Keysight-equipment@groups.io>
Sent: Wed, Dec 18, 2019 4:48 pm
Subject: [TekScopes] FS: sets of NOS concentric control knobs

Brad Thompson via Groups.Io wrote on 12/6/2019 10:29 A
Hello--
I'm offering FS sets of NOS concentric control knobs. These have
longitudinally-grooved
surfaces and black cursor markings which contrast nicely with the
aluminum knob material.

The top knob has a black insert.  Each knob gets secured to its control
shaft by two
.050-inch hex setscrews. A .jpg-format photo is available on request.

Bottom knob: 0.625 inches in diameter, 0.56 inches high, 0.25 inch
through hole
Top knob: 0.425 inches in diameter, 0.56 inches high, 0.125 inch blind
hole.

(Please note that the knobs are made from aluminum, a conductive metal,
and hence will pose a shock hazard if you're accustomed to the bad practice
of floating the ungrounded chassis of an instrument.)

Each set comprises three top/bottom pairs and as a bonus while
the supply lasts, four skirted plastic knobs with 0.125-inch
brass-insert blind hole and one 0.050-inch setscrew.

I'm asking $10.00 per package  (four two-piece knobsets), which includes
USPS first-class mail to U.S. locations.

Questions welcomed, PayPal honored.
Thanks, and 73--

Brad  AA1IP

FS: sets of NOS concentric control knobs

Brad Thompson
 

Brad Thompson via Groups.Io wrote on 12/6/2019 10:29 A
Hello--
I'm offering FS sets of NOS concentric control knobs. These have longitudinally-grooved
surfaces and black cursor markings which contrast nicely with the aluminum knob material.

The top knob has a black insert.  Each knob gets secured to its control shaft by two
.050-inch hex setscrews. A .jpg-format photo is available on request.

Bottom knob: 0.625 inches in diameter, 0.56 inches high, 0.25 inch through hole
Top knob: 0.425 inches in diameter, 0.56 inches high, 0.125 inch blind hole.

(Please note that the knobs are made from aluminum, a conductive metal,
and hence will pose a shock hazard if you're accustomed to the bad practice
of floating the ungrounded chassis of an instrument.)

Each set comprises three top/bottom pairs and as a bonus while
the supply lasts, four skirted plastic knobs with 0.125-inch
brass-insert blind hole and one 0.050-inch setscrew.

I'm asking $10.00 per package  (four two-piece knobsets), which includes
USPS first-class mail to U.S. locations.

Questions welcomed, PayPal honored.
Thanks, and 73--

Brad  AA1IP

Re: Tek 2465 Problem

GerryR
 

I had a similar, but not the same, problem when calibrating my 2465A and traced it to a channel 2 relay in the input module. The problem ended up being a burr on one of the relays the was digging into the plastic housing, preventing the relay from changing state. You can see pictures of what I did here:
https://www.eevblog.com/forum/testgear/tek-2465a-question/25/

After correcting the problem, it calibrated fine.

GerryR
KK4GER

----- Original Message -----
From: "Chuck Harris" <cfharris@...>
To: <TekScopes@groups.io>
Sent: Tuesday, December 17, 2019 8:45 PM
Subject: Re: [TekScopes] Tek 2465 Problem


Probes shouldn't make any difference to the ability
of the scope to trigger.

However, depending on whether the probe is a 1X, or
a 10X probe, different attenuator sections in the scope
will be used. The attenuator relays get thin films of
corrosion on their gold leads, and sometimes won't switch
reliably.

If the scope wasn't working properly, QService should not
have calibrated it until it was... It really isn't possible
to complete calibration with problems like you are describing.

I fix a lot of my customer's scopes that were supposedly
working perfectly, and were ready for calibration, but
had problems found during calibration. This is normal.

Bear in mind that the opamps you were probing are intended
to be sample and hold cells. The opamp is a unity gain
follower, with essentially infinite input impedance. It
is measuring the charge put in the hold capacitor by the mux.
The hold capacitor is only about 0.1uf, and will discharge
almost instantly when loaded by the input impedance of a DMM
or a scope probe.

-Chuck Harris

Panos wrote:
Yeah maybe it's better to do so. Nevertheless I thought about making an effort, since after the calibration the oscilloscope is working properly, apart from this detail.
To be fair opposite to QService, the calibration cost did not include any minor repairs to the machine.

In the meantime as I looking the reason for this problem, I made some progress. As I check the waveforms around the U500-U700-U800 according to the service manual, I see some instabilities on the signal during the interference.

Specific from the Inverted A Trigger output of U500 pin 18 to Trigger In of U700 pin 2.
After the same from the ramp output of U700 pin 35 to the A Sweep Input of the U735 pin 9.
Finally the same from the U735 pin3 to U800 A Sweep Input pin18.

That gave me the idea to look before the U500 the the trigger level lines A and B. There in A5 digital board, is a double operational amplifier marked as TL072, which drive the A and B trigger lines to U500.
Measuring the amplifier input and output with a voltmeter, I was surprised by the very low voltage across the full range of the trigger level control knob. The measurement was lower than +/- 500 mVolt across the range and in the trigger status about 200 mVolt in line A, contrary to 2.5 volt and 600 mVolt of line B.

I replaced the TL072 operational amplifier and now things was improved! As for the level of the voltage during trigger moment came at the same level for both A and B lines. About 600 mVolt.
Although it seemed that the problem was completely solved, something strange appeared using a different type probe.
As a remind, the interference was appeared when the volt/div selector was in the range of 20 mVolt and below (200 in my case using a x10 probe).

But enough with the written. I have to make a video.




Re: telonics sweep generator

Dave Seiter
 

You mean the power cord?  If so, Belden used to stock them, but probably not any more.  A lot of equipment from the sixties used them, particularly HP, and I've heard there are two different pinouts...  I always look for them at estate sales with related goods for sale.
-Dave

On Monday, December 16, 2019, 08:33:32 PM PST, battyhugh <@Hugh> wrote:

Thanks Dave - I'll try the eBay link first - where can I get the old
style 3 pin plug?

Re: Tek 2465 Problem

Chuck Harris
 

Probes shouldn't make any difference to the ability
of the scope to trigger.

However, depending on whether the probe is a 1X, or
a 10X probe, different attenuator sections in the scope
will be used. The attenuator relays get thin films of
corrosion on their gold leads, and sometimes won't switch
reliably.

If the scope wasn't working properly, QService should not
have calibrated it until it was... It really isn't possible
to complete calibration with problems like you are describing.

I fix a lot of my customer's scopes that were supposedly
working perfectly, and were ready for calibration, but
had problems found during calibration. This is normal.

Bear in mind that the opamps you were probing are intended
to be sample and hold cells. The opamp is a unity gain
follower, with essentially infinite input impedance. It
is measuring the charge put in the hold capacitor by the mux.
The hold capacitor is only about 0.1uf, and will discharge
almost instantly when loaded by the input impedance of a DMM
or a scope probe.

-Chuck Harris

Panos wrote:

Yeah maybe it's better to do so. Nevertheless I thought about making an effort, since after the calibration the oscilloscope is working properly, apart from this detail.
To be fair opposite to QService, the calibration cost did not include any minor repairs to the machine.

In the meantime as I looking the reason for this problem, I made some progress. As I check the waveforms around the U500-U700-U800 according to the service manual, I see some instabilities on the signal during the interference.

Specific from the Inverted A Trigger output of U500 pin 18 to Trigger In of U700 pin 2.
After the same from the ramp output of U700 pin 35 to the A Sweep Input of the U735 pin 9.
Finally the same from the U735 pin3 to U800 A Sweep Input pin18.

That gave me the idea to look before the U500 the the trigger level lines A and B. There in A5 digital board, is a double operational amplifier marked as TL072, which drive the A and B trigger lines to U500.
Measuring the amplifier input and output with a voltmeter, I was surprised by the very low voltage across the full range of the trigger level control knob. The measurement was lower than +/- 500 mVolt across the range and in the trigger status about 200 mVolt in line A, contrary to 2.5 volt and 600 mVolt of line B.

I replaced the TL072 operational amplifier and now things was improved! As for the level of the voltage during trigger moment came at the same level for both A and B lines. About 600 mVolt.
Although it seemed that the problem was completely solved, something strange appeared using a different type probe.
As a remind, the interference was appeared when the volt/div selector was in the range of 20 mVolt and below (200 in my case using a x10 probe).

But enough with the written. I have to make a video.