Date   

Re: Low cost Scope-Mobile alternatives?

garp66
 

Anything wrong with the Tektronix K420 or K475 carts ??
e.g.) https://www.tek.com/manual/k420

I find they are ideal for stacks of heavy large equipment, easy to roll around, & 'turn on a dime' ; huge nice wheels !
One is used for a Tek dedicated test station, and the other for the large HP 70K MMS (HP 70004a + HP 70001a) system.

I have found these beauties surplus for ~ $100.
rick


Re: 2215 avoiding future CRT damage

Brian Cockburn
 

Hi Håkan,

That SUP is interesting. Do you have any other SUPs for other Tek gear? (I had a brief look on your website but wasn't able to find anything.)

Thanks, Brian.


Tek 2205C

ANAND K. PARAMESHWARAN
 

Hi All

Good Evening

I am looking out for Tek slide Switches 260-2291-00, 260-2293-00, 260-2292-00 mounted on front panel board


Can anyone help

Thanks in advance

Anand


Re: Source for 1/8" fibreglass or other hard plastic rod in UK

 

Thanks Dennis, I've found a source of what are described as 1/8" styrene
(sic) rods, which I'll try.

I think they will be polystyrene rather than styrene though!

Dave

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Dennis
Tillman W7PF
Sent: 11 July 2018 04:04
To: TekScopes@groups.io
Subject: Re: [TekScopes] Source for 1/8" fibreglass or other hard plastic
rod in UK

Hi David,

If you want I can purchase something like what you are looking for. Hobby
shops in my area sell carbon fiber rods and they are not very expensive.

Alternatively I can give you what I have salvaged from parts mules if you
let me know the length you want. These would be genuine Tek rods.

I would be happy to mail you some. They are so light I doubt postage would
be much.

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
David C. Partridge
Sent: Saturday, July 07, 2018 10:27 AM
To: TekScopes <Tekscopes@groups.io>
Subject: [TekScopes] Source for 1/8" fibreglass or other hard plastic
rod in UK

I'm looking for a UK source of 1/8" (0.125" or 3.2mm) diameter
fibreglass rods (or other hard plastic) such as is used in many 7000
series plugins.

For the specific application (the rod down the middle of plastic
expansion
rivet) a 3mm rod won't do.

I only want a small quantity, so any suppliers with large minimum
orders would be a problem.

Thanks
David



--
Dennis Tillman W7PF
TekScopes Moderator


Re: OT: Scopes and other electronics on "The Outer Limits"

Glydeck
 

Albert,

Do you live near the tower? I live in Studio City just off Laurel Canyon.

George

On Jul 10, 2018, at 8:13 PM, Albert LaFrance <albert.lafrance@...> wrote:

The radio tower used in the original "Galaxy Being" is still standing:
<https://goo.gl/maps/Uq7VGfjmFuM2>


-----Original Message-----
From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of Michael A. Terrell
Sent: Tuesday, July 10, 2018 10:21 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] OT: Scopes and other electronics on "The Outer Limits"

The remake reused many of the original scripts but it had much better props. The one they really should have remade was the original, 'Galaxy Being'. That so called radio station looked like something from what 'Sanford & Son' would have tossed out.

The remake was 32 years after the first episode of the original series, so technology had changed a lot during that time.

https://www.imdb.com/title/tt0112111/
Michael A. Terrell


-----Original Message-----
From: Harvey White <madyn@...>

All in the technology of the times. Note that they did not imagine any
kind of technology (interface wise) that was different from what they
had, just that it did futuristic stuff.





Re: Low cost Scope-Mobile alternatives?

Michael A. Terrell
 

I'm aware of the safety issues. I would use multiple, current limited regulators so that I had one for each output.

The other advantage of a system like that would be that a couple 12V AGM lead acid batteries in series would also provide backup power for everything.

I used to have an adjustable 12V system on my workbench that would let me run almost anything from a single transistor, up to a 12V starter motor. I had a lot of test fixtures and some homebrew equipment that all ran on 12V, so everything was powered with one switch. Another would parallel two high Amp Hour car batteries in parallel to work on early two way radios. In that case, the size of the power leads was chosen to fuse, if the current regulator failed.

Have you seen the power dividers made for CCTV systems? One input to four or eight outputs to power cameras. The only downside is that they are only about a foot long.
https://www.ebay.com/itm/322132293184

Michael A. Terrell

-----Original Message-----
From: stefan_trethan <stefan_trethan@...>
Sent: Jul 11, 2018 12:13 AM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Low cost Scope-Mobile alternatives?

Careful with the low voltage distribution to avoid differences in
ground potential or ground loops.
Also, a lot of equipment is designed and tested to be safe with the
supplied power supply, a larger one may supply enough power to cause a
fire in case of a fault. There are shortcuts you can take during
safety certification whan you are using a limited source of power for
your product.

Don't think I want to warn you off this, it's a good idea in many
cases, and I've done the same, just wanted to remind you of potential
issues.


Re: Low cost Scope-Mobile alternatives?

stefan_trethan
 

Careful with the low voltage distribution to avoid differences in
ground potential or ground loops.
Also, a lot of equipment is designed and tested to be safe with the
supplied power supply, a larger one may supply enough power to cause a
fire in case of a fault. There are shortcuts you can take during
safety certification whan you are using a limited source of power for
your product.

Don't think I want to warn you off this, it's a good idea in many
cases, and I've done the same, just wanted to remind you of potential
issues.

ST

On Wed, Jul 11, 2018 at 5:43 AM, Michael A. Terrell
<mike.terrell@...> wrote:
I have two full ones on my computer desk, and I'm trying to find room for a third strip. It's either that, or I need to build a 12V, 9V, and 5V distribution system to replace almost two dozen warts. I have another one behind the TV, and networking equipment in my bedroom. Who knew you would need over four dozen outlets in a 100 square foot room?


Michael A. Terrell


-----Original Message-----
From: Jim Ford <james.ford@...>
Sent: Jul 10, 2018 11:18 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Low cost Scope-Mobile alternatives?

I second that. Just bought 3 of them a few weeks ago myself. Paid more than $15, though. Screwed them to the back of my (wooden) work bench. Room for a few more should the need arise....

Sent from my Verizon, Samsung Galaxy smartphone
-------- Original message --------From: "Michael A. Terrell" <mike.terrell@...> Date: 7/10/18 8:01 PM (GMT-08:00) To: TekScopes@groups.io Subject: Re: [TekScopes] Low cost Scope-Mobile alternatives?
Check out their four foot, 12 outlet power strips while you're there. They go on sale for $15 fairly often. I bought four more the last time. That makes about eight or nine of them, so far.


Re: 7A29 attenuator fault corrosion issue

glkinst@...
 

Adrian,
Thank you for the insight. I have the same problem with several 7A29s. They worked fine years ago, but now all except for one and a 7A29P have the issue you describe. I thought it might be the attenuator resistors deteriorating with age but maybe it is just the ground contact that you describe.

It was hard to account for the deterioration in rise-time from misuse or static discharge as they have spent most of their life stored in the scope cart drawer. I will investigate and report back. George


Re: Low cost Scope-Mobile alternatives?

Michael A. Terrell
 

I have two full ones on my computer desk, and I'm trying to find room for a third strip. It's either that, or I need to build a 12V, 9V, and 5V distribution system to replace almost two dozen warts. I have another one behind the TV, and networking equipment in my bedroom. Who knew you would need over four dozen outlets in a 100 square foot room?


Michael A. Terrell

-----Original Message-----
From: Jim Ford <james.ford@...>
Sent: Jul 10, 2018 11:18 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Low cost Scope-Mobile alternatives?

I second that.   Just bought 3 of them a few weeks ago myself.  Paid more than $15, though.  Screwed them to the back of my (wooden) work bench.   Room for a few more should the need arise....

Sent from my Verizon, Samsung Galaxy smartphone
-------- Original message --------From: "Michael A. Terrell" <mike.terrell@...> Date: 7/10/18 8:01 PM (GMT-08:00) To: TekScopes@groups.io Subject: Re: [TekScopes] Low cost Scope-Mobile alternatives?
Check out their four foot, 12 outlet power strips while you're there. They go on sale for $15 fairly often. I bought four more the last time. That makes about eight or nine of them, so far.


Re: OT: Scopes and other electronics on "The Outer Limits"

Michael A. Terrell
 

That's an OK tower, but it's not Blaw Knox cool like the WLW or WSM towers. :)


Michael A. Terrell

-----Original Message-----
From: Albert LaFrance <albert.lafrance@...>
Sent: Jul 10, 2018 11:13 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] OT: Scopes and other electronics on "The Outer Limits"

The radio tower used in the original "Galaxy Being" is still standing:
<https://goo.gl/maps/Uq7VGfjmFuM2>


Re: Low cost Scope-Mobile alternatives?

Jim Ford
 

I second that.   Just bought 3 of them a few weeks ago myself.  Paid more than $15, though.  Screwed them to the back of my (wooden) work bench.   Room for a few more should the need arise....

Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------From: "Michael A. Terrell" <mike.terrell@...> Date: 7/10/18 8:01 PM (GMT-08:00) To: TekScopes@groups.io Subject: Re: [TekScopes] Low cost Scope-Mobile alternatives?
Check out their four foot, 12 outlet power strips while you're there. They go on sale for $15 fairly often. I bought four more the last time. That makes about eight or nine of them, so far.

<https://www.harborfreight.com/12-outlet-4-ft-metal-power-strip-62494.html>

Michael A. Terrell


-----Original Message-----
From: Pete Lancashire <xyzzypdx@...>
Sent: Jul 10, 2018 10:51 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Low cost Scope-Mobile alternatives?

Don't know why I haven't thought about it and I have a harbor freight less
than 2 miles away from me.


Re: OT: Scopes and other electronics on "The Outer Limits"

Albert LaFrance
 

The radio tower used in the original "Galaxy Being" is still standing:
<https://goo.gl/maps/Uq7VGfjmFuM2>

-----Original Message-----
From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of Michael A. Terrell
Sent: Tuesday, July 10, 2018 10:21 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] OT: Scopes and other electronics on "The Outer Limits"

The remake reused many of the original scripts but it had much better props. The one they really should have remade was the original, 'Galaxy Being'. That so called radio station looked like something from what 'Sanford & Son' would have tossed out.

The remake was 32 years after the first episode of the original series, so technology had changed a lot during that time.

https://www.imdb.com/title/tt0112111/
Michael A. Terrell


-----Original Message-----
From: Harvey White <madyn@...>

All in the technology of the times. Note that they did not imagine any
kind of technology (interface wise) that was different from what they
had, just that it did futuristic stuff.


Re: Source for 1/8" fibreglass or other hard plastic rod in UK

 

Hi David,

If you want I can purchase something like what you are looking for. Hobby
shops in my area sell carbon fiber rods and they are not very expensive.

Alternatively I can give you what I have salvaged from parts mules if you
let me know the length you want. These would be genuine Tek rods.

I would be happy to mail you some. They are so light I doubt postage would
be much.

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
David C. Partridge
Sent: Saturday, July 07, 2018 10:27 AM
To: TekScopes <Tekscopes@groups.io>
Subject: [TekScopes] Source for 1/8" fibreglass or other hard plastic
rod in UK

I'm looking for a UK source of 1/8" (0.125" or 3.2mm) diameter
fibreglass rods (or other hard plastic) such as is used in many 7000
series plugins.

For the specific application (the rod down the middle of plastic
expansion
rivet) a 3mm rod won't do.

I only want a small quantity, so any suppliers with large minimum
orders would be a problem.

Thanks
David



--
Dennis Tillman W7PF
TekScopes Moderator


Re: Low cost Scope-Mobile alternatives?

Michael A. Terrell
 

Check out their four foot, 12 outlet power strips while you're there. They go on sale for $15 fairly often. I bought four more the last time. That makes about eight or nine of them, so far.

<https://www.harborfreight.com/12-outlet-4-ft-metal-power-strip-62494.html>

Michael A. Terrell

-----Original Message-----
From: Pete Lancashire <xyzzypdx@...>
Sent: Jul 10, 2018 10:51 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Low cost Scope-Mobile alternatives?

Don't know why I haven't thought about it and I have a harbor freight less
than 2 miles away from me.


Re: Searching for post about Tektronix front panel fabrication/printing process

 

Hi Toby,
You are in luck.
There is an excellent video on how Tek did this on the vintageTEK Museum web site It is here:
https://youtu.be/F_p5YsIImMY

Dennis Tillman W7PF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of
toby@...
Sent: Saturday, June 30, 2018 1:41 PM
To: TekScopes@groups.io
Subject: [TekScopes] Searching for post about Tektronix front panel
fabrication/printing process

Sorry for the vague post, but I remember in the last year or so,
somebody giving a detailed description on how the Tektronix front
panels were produced for durability, with respect to anodizing, silk
screening, etc. Probably Dennis? or Chuck? … I rummaged through my
archives but didn't find the post. If the author remembers it, maybe
they can link it in this thread?

I did find some older posts by search though, but I think the one I
mean is much more comprehensive.
e.g. https://groups.io/g/TekScopes/message/111625 ;
https://groups.io/g/TekScopes/message/101696

Thanks for any help.



--
Dennis Tillman W7PF
TekScopes Moderator


Re: Low cost Scope-Mobile alternatives?

Pete Lancashire
 

Don't know why I haven't thought about it and I have a harbor freight less
than 2 miles away from me.

On Tue, Jul 10, 2018, 7:11 PM Michael A. Terrell <mike.terrell@...>
wrote:

We used to pile three feet or more of heavy old HP equipment on each cart
at Microdyne. When something needed serviced or calibrated, the entire cart
was rolled into the cal lab. We used the larger carts, and added a 3/4"
plywood top, with strips of 1"x2" along the sides and back to keep it from
moving. The strips fit snugly against the inside of the top shelf, and not
only gave a flat work surface, but it gave extra strength. For very light
loads, we simply flipped the top shelf upside down, and used it that way.

We left a six inch gap at the front to store probes and cables. Most of
these carts held over 300 pounds of equipment and most work stations had
more than one cart. Mine was a little different. I also had a cart with a
stereo microscope, and another with a computer to run software driven test
fixtures. Due to the wide variety of items worked on I had four
workbenches, instead of the usual one or two.

Here is the Harbor freight version of the carts we used. The company
refused to buy them, because they weren't made in the U.S.


https://www.harborfreight.com/24-inch-x-36-inch-steel-service-cart-5770.html
Michael A. Terrell


-----Original Message-----
From: Pete Lancashire <xyzzypdx@...>
Sent: Jul 10, 2018 9:26 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Low cost Scope-Mobile alternatives?

My interest is a cart that can hold the heavier stuff and rack with like
the 11k Scopes. The next card I need will have to hold an HP synthesizer
that weighs 70 lb and hopefully a spectrum analyzer on top of that that
has
a total weight of 95 lb
The Tek cart that came with my 11403A I am going to try to put on top of
it
11301 a.

This old test equipment is darn heavy



Re: OT: Scopes and other electronics on "The Outer Limits"

Michael A. Terrell
 

The remake reused many of the original scripts but it had much better props. The one they really should have remade was the original, 'Galaxy Being'. That so called radio station looked like something from what 'Sanford & Son' would have tossed out.

The remake was 32 years after the first episode of the original series, so technology had changed a lot during that time.

https://www.imdb.com/title/tt0112111/
Michael A. Terrell

-----Original Message-----
From: Harvey White <madyn@...>

All in the technology of the times. Note that they did not imagine
any kind of technology (interface wise) that was different from what
they had, just that it did futuristic stuff.


Re: [OT] Philips PP 1071 electronic switch unit

Sebastian Garcia
 

Thanks also to Leon Robinson, who also suggested (in a direct e-mail) to check-out the 2-channel switch model from Heathkit. (BTW Leon: your ISP, SBCglobal, is wrongly rejecting mails from my IP).

Sebastian.




Sebastian Garcia 5:39am #149580
Thank you, Michael. Actually I have only pieces of it (most pieces, I think), so an schematic would be ideal for making sense of them.

Best regards,
Sebastian.



Michael A. Terrell 4:19am #149579

It appears to be two, 15MHz amplifiers to convert a single channel scope into a four channel display. In other words, it is a pair of the electronic switches that were common for early single channel scopes.

They were also kit versions and construction projects. They used a twin Triode to create an adjustable square wave to drive the chopper, and each input had an amplifier with adjustments for both gain and position. Heathkit made the S1, S2 and S3, ID22, models, and at least the S3 schematic is on line because I have a copy of its schematic.

There is a description of this item in a book about scopes:

<https://books.google.com/books?id=ytjqCAAAQBAJ&pg=PA300&lpg=PA300&dq=philips+PP1071+switch&source=bl&ots=s2KjeBGL9a&sig=DHny9MiSMGcX0EKubSBjGYsfn1s&hl=en&sa=X&ved=0ahUKEwjZob32r5TcAhUKOawKHZj0AwsQ6AEIPDAH#v=onepage&q=philips%20PP1071%20switch&f=false>

Here is the Heathkit S-3S schematic:

<http://www.heathkit-museum.com/test/images/s-3s.jpg>


You have an advantage in having two switches, in that you can compare them to locate problems. As always, make sure the DC rails in the power supply are clean. The filter caps are likely 50 years old, or more.


Michael A. Terrell
. . .

-----Original Message-----
From: Sebastian Garcia <sg-listas@...>
Sent: Jul 9, 2018 11:06 PM
To: TekScopes@groups.io
Subject: [TekScopes] [OT] Philips PP 1071 electronic switch unit

Hi, Could somebody provide the schematics/manual of this equipment (or similar Philips model) [1] ?
It is an (independent, including power supply) chopping unit, to turn any single trace scope into a into 2-trace one.
Mainly tube-based, some silicon diodes, a couple of selenium rectifier bridges, some power transistors. Seems to be from ~1960/65.

Any data would be greatly appreciated,
Sebastian.

[1] Philips PP 1071 electronic switch unit
https://www.radiomuseum.org/r/philips_pp1071_pp_107.html


Re: Low cost Scope-Mobile alternatives?

Michael A. Terrell
 

We used to pile three feet or more of heavy old HP equipment on each cart at Microdyne. When something needed serviced or calibrated, the entire cart was rolled into the cal lab. We used the larger carts, and added a 3/4" plywood top, with strips of 1"x2" along the sides and back to keep it from moving. The strips fit snugly against the inside of the top shelf, and not only gave a flat work surface, but it gave extra strength. For very light loads, we simply flipped the top shelf upside down, and used it that way.

We left a six inch gap at the front to store probes and cables. Most of these carts held over 300 pounds of equipment and most work stations had more than one cart. Mine was a little different. I also had a cart with a stereo microscope, and another with a computer to run software driven test fixtures. Due to the wide variety of items worked on I had four workbenches, instead of the usual one or two.

Here is the Harbor freight version of the carts we used. The company refused to buy them, because they weren't made in the U.S.

https://www.harborfreight.com/24-inch-x-36-inch-steel-service-cart-5770.html
Michael A. Terrell

-----Original Message-----
From: Pete Lancashire <xyzzypdx@...>
Sent: Jul 10, 2018 9:26 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Low cost Scope-Mobile alternatives?

My interest is a cart that can hold the heavier stuff and rack with like
the 11k Scopes. The next card I need will have to hold an HP synthesizer
that weighs 70 lb and hopefully a spectrum analyzer on top of that that has
a total weight of 95 lb
The Tek cart that came with my 11403A I am going to try to put on top of it
11301 a.

This old test equipment is darn heavy


Re: Low cost Scope-Mobile alternatives?

Pete Lancashire
 

My interest is a cart that can hold the heavier stuff and rack with like
the 11k Scopes. The next card I need will have to hold an HP synthesizer
that weighs 70 lb and hopefully a spectrum analyzer on top of that that has
a total weight of 95 lb
The Tek cart that came with my 11403A I am going to try to put on top of it
11301 a.

This old test equipment is darn heavy

On Tue, Jul 10, 2018, 5:55 PM Michael A. Terrell <mike.terrell@...>
wrote:

It's not that hard to bend up a larger top pan, with hand tools. Or add a
piece of plywood, and a hold down strap. There are cheap belts on Ebay that
would work fine. These are what I bought to wear, but I bought two extra to
use on carts.
https://www.ebay.com/itm/223013223752 They are $1.95 each.

Michael A. Terrell


-----Original Message-----
From: Al Holt <@wd4ah>
Sent: Jul 10, 2018 8:29 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Low cost Scope-Mobile alternatives?

On Tue, Jul 10, 2018 at 05:19 pm, Michael A. Terrell wrote:

How about a cheap welding cart, or make a copy of the design from the
online manual?
https://www.harborfreight.com/welding-cart-69340.html
The welding cart is nice in it has a sloping front, but the one I looked
at Harbor Freight just doesn't have the depth to handle the 7603 from what
I could tell.