Date   

Re: TM506

Harvey White
 

I had a similar problem on another unit, might have been one of the FG series.  The pullup transistor for the output was bad.  I did check the waveforms from the beginning of the output amplifier to the end.  Square waves aren't your friends for looking for distortion, sines are (if you have an audio distortion meter), and triangles are as well.

Check the no-signal output voltages, you should be able to achieve a DC offset of zero volts with no output.  Increasing the output while watching it on a scope should start to show distortion at higher amplitudes (guessing that insufficient + excursion is in the amplifier.

Many of the boards will discolor over time in the presence of heat.  This is more or less normal, but ugly.  discolored board with charred part, that isn't.

Harvey

On 7/25/2020 3:30 PM, Stephen wrote:
Ok, now that the TM506 is up and running perfectly again (thanks to all of you who guided me), now I have 3 plugins to fix: FG502, DC503, and SC502.
Starting with the FG502. I took a closer look at it today. Visual inspection. R532 was charred. I replaced it, as well as C532. All the other resistors in that cluster read the correct 33 ohm value. A large area in that zone seems to have been exposed to a lot of heat. The bord is discolored. However, all the traces are present and good. I did redo some solder joints though. But I still have the same problem. As long as I don’t go up past (10 -2), all is kind of ok if I don’t push the voltage past 9 o’clock. The square waves are far from being sharp, but at least they look like square waves. Past 9 o’clock it gets extremely noisy and distorted, and the waveforms don’t look the way they should. Starting at (10 -3) everything is ugly and completely off. Sines look like triangles, and square waves pretty much the same, no matter what the voltage is set at.
Since everything is base on the triangle wave... Should I start by looking at that first? Or is the voltage output messing everything up? Regulator problem maybe?
BTW, I’ve of course checked all the voltages, and they’re dead on: +20, -19.9, 17.1, -17.1



Re: Is it OK to talk Keithley here since it's part of Tek?

Roy Thistle
 

On Sat, Jul 25, 2020 at 12:40 PM, Dennis Tillman W7pF wrote:


I may have to ask you to setup a Keithley Forum on Groups.io of your own.
Hi Dennis, Ed:
I'm sure you know... but for others... Dr. Dave runs a group that includes Keithley... searchable on Groups.io.
Best regards.
Roy


Re: Tek R561B on CL in Austin SOLD

John Griessen
 

On 7/25/20 3:02 PM, Dennis Tillman W7pF wrote:
John, Please provide an email address or contact information where members interested in your scope can contact you OFF LIST.
craigslist had all that contact, and the scope is sold now.


Re: Tek R561B on CL in Austin

 

John, Please provide an email address or contact information where members interested in your scope can contact you OFF LIST.
Bruce Gentry and flightsimalex@aol.com,
Please contact John off list at the contact information he provides.
Dennis Tillman W7pF
--
Dennis Tillman W7pF
TekScopes Moderator


Re: Ferrite Beads in Tek Transistor Adapters

 

This forum is all about classic Tektronix test equipment, its use, repair, and collecting.

This is not a forum about how California chooses to govern itself.

What California does or does not do is irrelevant to my original question about ferrites used in Tek Transistor adapters.

Dennis Tillman W7pF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Dave Seiter
Sent: Friday, July 24, 2020 7:29 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Ferrite Beads in Tek Transistor Adapters

As a former environmental compliance guy in CA, I can say that it's mind-numbingly inane. Everything is potentially toxic or dangerous- it's just a matter of quantity/frequency (drinking too much water can kill you, you can be crushed by cabbages, anaphylaxis from cat hair, etc) At some point, all the warnings become meaningless, kind of like advertising (which I ignore and remove whenever possible). The nanny state at it's finest, thanks mostly to lawyers...
OTOH, it might be nice if older Tek scopes had warnings about weight (don't try to pick up a 519 if your back has been acting up!) -Dave
On Sunday, July 19, 2020, 06:35:20 PM PDT, Carsten Bormann <cabocabo@gmail.com> wrote:

On 2020-07-20, at 03:20, Chuck Harris <cfharris@erols.com> wrote:

Everything is known to cause cancer in the state of California....
Makes me glad I don't live there.
They say:


Why is this here?
As of August 2018 the State of California has changed the requirements of the "Prop 65" law. We now must list on our website any possible chemicals the can cause cancer, birth defects or reproductive problem.

As an example:
• ABS plastic contains styrene
• PVC wire insulation can contain Di(2-ethylhexyl)phthalate (DEHP)
• electrolytic capacitors can contain Ethylene glycol
• Brass can contain Lead
• flame retardant pc boards can contain Tetrabromobisphenol A (TBBPA)
• Aluminum alloys can contain Chromium

To put it simply we are a small company and do not have the resources to test every single part, so we list every thing as hazardous. Please recycle all electronic parts responsibly and under no circumstance eat, drink or smoke these parts and wash your hands after touching!


Typical cop-out created by non-thinking regulation.
But I generally agree with the advice not to try smoking ferrite beads.

Grüße, Carsten








--
Dennis Tillman W7pF
TekScopes Moderator


Re: Is it OK to talk Keithley here since it's part of Tek?

 

Hi Ed,
I would think you would have a lot more success finding answers to any Keithley questions you may have in a forum devoted to Keithley.

But since Danaher bought Keithley in 2010 and merged it with Tektronix shortly afterwards I suppose anything made with the Keithley name on it AFTER their merger in 2010 is a Tek product.

If the members of TekScopes find discussions of Keithley to be distracting I may have to ask you to setup a Keithley Forum on Groups.io of your own.

Dennis Tillman W7pF

-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Ed Breya via groups.io
Sent: Thursday, July 23, 2020 9:09 AM
To: TekScopes@groups.io
Subject: [TekScopes] Is it OK to talk Keithley here since it's part of Tek?

As many know, Tek has owned Keithley for some time. Is it OK to include any Keithley stuff here, considering it's now under the Tek umbrella/brand?

Ed





--
Dennis Tillman W7pF
TekScopes Moderator


Re: TM506

Stephen
 

Ok, now that the TM506 is up and running perfectly again (thanks to all of you who guided me), now I have 3 plugins to fix: FG502, DC503, and SC502.
Starting with the FG502. I took a closer look at it today. Visual inspection. R532 was charred. I replaced it, as well as C532. All the other resistors in that cluster read the correct 33 ohm value. A large area in that zone seems to have been exposed to a lot of heat. The bord is discolored. However, all the traces are present and good. I did redo some solder joints though. But I still have the same problem. As long as I don’t go up past (10 -2), all is kind of ok if I don’t push the voltage past 9 o’clock. The square waves are far from being sharp, but at least they look like square waves. Past 9 o’clock it gets extremely noisy and distorted, and the waveforms don’t look the way they should. Starting at (10 -3) everything is ugly and completely off. Sines look like triangles, and square waves pretty much the same, no matter what the voltage is set at.
Since everything is base on the triangle wave... Should I start by looking at that first? Or is the voltage output messing everything up? Regulator problem maybe?
BTW, I’ve of course checked all the voltages, and they’re dead on: +20, -19.9, 17.1, -17.1


Re: Tek R561B on CL in Austin

flightsimalex@...
 

I'm interested... My dad lives in Aus and could pick up... Where in Austin and do you take PayPal?


Re: Dead TM500 plug-in sought

DaveH52
 

I bought one of these to act as an extender:
https://www.amazon.com/gp/product/B00F1YQMXO/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&;psc=1
and it works perfectly without an modification other than cutting a slot in the male end to accommodate the connector keys in the chassis.


Re: Need help with 11801 delay jitter #photo-notice

lccavalheiro@...
 

I was actually thinking about that. I'm wondering what would be the worst-case jitter on Leo's pulser. The laser driver use claims typical 4 ps pk-pk deterministic and 0.55 ps RMS random jitter. I guess that would be the major source of jitter there.


Re: Ferrite Beads in Tek Transistor Adapters

Glydeck
 

Chuck,

Totally agree! So does having or not having a basic education.

Staying on topic, the ferrite beads work well for building your own test fixtures.

George

On Jul 25, 2020, at 8:02 AM, Chuck Harris <cfharris@erols.com> wrote:

Votes have consequences.

Glydeck via groups.io wrote:
You should click on The link “Why is this here” on the All Electronics page. This would be the reality of good intentions gone wrong and ultimately becoming useless.

“As of August 2018 the State of California has changed the requirements of the "Prop 65" law. We now must list on our website any possible chemicals the can cause cancer, birth defects or reproductive problem.
To put it simply we are a small company and do not have the resources to test every single part, so we list every thing as hazardous. Please recycle all electronic parts responsibly and under no circumstance eat, drink or smoke these parts and wash your hands after touching!”
On Jul 25, 2020, at 7:11 AM, Michael W. Lynch via groups.io <mlynch003=yahoo.com@groups.io> wrote:

On Fri, Jul 24, 2020 at 09:30 PM, Dave Seiter wrote:


I can say that it's mind-numbingly inane. Everything is potentially toxic or
dangerous- it's just a matter of quantity/frequency (drinking too much water
can kill you, you can be crushed by cabbages, anaphylaxis from cat hair, etc)
This is why we have "Warning" labels on Preparation H that states "not to be taken orally".

--
Michael Lynch
Dardanelle, AR






Re: Ferrite Beads in Tek Transistor Adapters

Chuck Harris
 

Votes have consequences.

Glydeck via groups.io wrote:

You should click on The link “Why is this here” on the All Electronics page. This would be the reality of good intentions gone wrong and ultimately becoming useless.

“As of August 2018 the State of California has changed the requirements of the "Prop 65" law. We now must list on our website any possible chemicals the can cause cancer, birth defects or reproductive problem.
To put it simply we are a small company and do not have the resources to test every single part, so we list every thing as hazardous. Please recycle all electronic parts responsibly and under no circumstance eat, drink or smoke these parts and wash your hands after touching!”
On Jul 25, 2020, at 7:11 AM, Michael W. Lynch via groups.io <mlynch003=yahoo.com@groups.io> wrote:

On Fri, Jul 24, 2020 at 09:30 PM, Dave Seiter wrote:


I can say that it's mind-numbingly inane. Everything is potentially toxic or
dangerous- it's just a matter of quantity/frequency (drinking too much water
can kill you, you can be crushed by cabbages, anaphylaxis from cat hair, etc)
This is why we have "Warning" labels on Preparation H that states "not to be taken orally".

--
Michael Lynch
Dardanelle, AR





Re: Ferrite Beads in Tek Transistor Adapters

Glydeck
 

You should click on The link “Why is this here” on the All Electronics page. This would be the reality of good intentions gone wrong and ultimately becoming useless.

“As of August 2018 the State of California has changed the requirements of the "Prop 65" law. We now must list on our website any possible chemicals the can cause cancer, birth defects or reproductive problem.
To put it simply we are a small company and do not have the resources to test every single part, so we list every thing as hazardous. Please recycle all electronic parts responsibly and under no circumstance eat, drink or smoke these parts and wash your hands after touching!”

On Jul 25, 2020, at 7:11 AM, Michael W. Lynch via groups.io <mlynch003=yahoo.com@groups.io> wrote:

On Fri, Jul 24, 2020 at 09:30 PM, Dave Seiter wrote:


I can say that it's mind-numbingly inane. Everything is potentially toxic or
dangerous- it's just a matter of quantity/frequency (drinking too much water
can kill you, you can be crushed by cabbages, anaphylaxis from cat hair, etc)
This is why we have "Warning" labels on Preparation H that states "not to be taken orally".

--
Michael Lynch
Dardanelle, AR



Re: Ferrite Beads in Tek Transistor Adapters

Stephen
 

On Sat, Jul 25, 2020 at 03:11 AM, Michael W. Lynch wrote:

This is why we have "Warning" labels on Preparation H that states "not to be
taken orally".

--
Michael Lynch
Dardanelle, AR
😂😂😂


Re: Ferrite Beads in Tek Transistor Adapters

Michael W. Lynch
 

On Fri, Jul 24, 2020 at 09:30 PM, Dave Seiter wrote:


I can say that it's mind-numbingly inane. Everything is potentially toxic or
dangerous- it's just a matter of quantity/frequency (drinking too much water
can kill you, you can be crushed by cabbages, anaphylaxis from cat hair, etc)
This is why we have "Warning" labels on Preparation H that states "not to be taken orally".

--
Michael Lynch
Dardanelle, AR


Re: Ferrite Beads in Tek Transistor Adapters

Dave Seiter
 

As a former environmental compliance guy in CA, I can say that it's mind-numbingly inane. Everything is potentially toxic or dangerous- it's just a matter of quantity/frequency (drinking too much water can kill you, you can be crushed by cabbages, anaphylaxis from cat hair, etc) 
At some point, all the warnings become meaningless, kind of like advertising (which I ignore and remove whenever possible).  The nanny state at it's finest, thanks mostly to lawyers...
OTOH, it might be nice if older Tek scopes had warnings about weight (don't try to pick up a 519 if your back has been acting up!)
-Dave

On Sunday, July 19, 2020, 06:35:20 PM PDT, Carsten Bormann <cabocabo@gmail.com> wrote:

On 2020-07-20, at 03:20, Chuck Harris <cfharris@erols.com> wrote:

Everything is known to cause cancer in the state of
California.... Makes me glad I don't live there.
They say:


Why is this here?
As of August 2018 the State of California has changed the requirements of the "Prop 65" law. We now must list on our website any possible chemicals the can cause cancer, birth defects or reproductive problem.

As an example:
    • ABS plastic contains styrene
    • PVC wire insulation can contain Di(2-ethylhexyl)phthalate (DEHP)
    • electrolytic capacitors can contain Ethylene glycol
    • Brass can contain Lead
    • flame retardant pc boards can contain Tetrabromobisphenol A (TBBPA)
    • Aluminum alloys can contain Chromium

To put it simply we are a small company and do not have the resources to test every single part, so we list every thing as hazardous. Please recycle all electronic parts responsibly and under no circumstance eat, drink or smoke these parts and wash your hands after touching!


Typical cop-out created by non-thinking regulation.
But I generally agree with the advice not to try smoking ferrite beads.

Grüße, Carsten


Re: 485 Cordwrap Feet

Roy Thistle
 

On Thu, Jul 23, 2020 at 12:10 PM, Michael W. Lynch wrote:


The cordwrap feet are also handy for when you do not need the entire cord
length, but want to have the instrument plugged in.
Feet on any of these series of Tek with bale handles (like on a 475)... are a blessing, and a curse when they rot! I often have to store them horizontally... and that's when the feet fail! (Foot rot failure [ and retrofit feet] are a well known and much discussed topic on TekScopes... I'm just saying, I wish I had intact ones on everything.) Nope.. won't pay even 20.00 for feet.


FS Tek C30 camera

Phillip Potter
 

Hi all,
I have a Tektronix C30 camera that I would like to sell. I'm asking $30 + shipping

Will consider offers. PLEASE REPLY OFF LIST!

Thanks,
Phil


More goodies uploaded to the Sphere Stuff Day event on line.

 

Just added all kinds of Tek, HP, Boonton, Narda and HP items to the site, as well as lots of unusual semiconductors and parts. Also a beautiful ESI 295 digital capacitance bridge. Drop by over the weekend and look around, it's like a virtual surplus store adventure on line. A nice change from Netflix.

https://www.sphere.bc.ca/test/stuffday.html

Still have some tek 465M timebases, 7B53A's and a very sexy 2216 quad trace digital scope. There's still a few free Kk and 7K plug-ins left to add to orders on request, and I found a partial 11K high speed 50 ohm vertical with the 2 front end vertical relay attenuators in it, can be free for the first person that asks for it (off-list, please!).

We are off to look at an estate sale Aug 1 that has a LOT of tek plug ins, some 2/3 series and 5K/7K.. no idea yet what the cost will be, but we will try and round up some good ones, and pass them along as cheaply as we can to anybody interested.

Be safe over the weekend!
all the best,
walter (walter2 -at- sphere.bc.ca)
sphere research corp.


Re: Dead TM500 plug-in sought

 

Colin,

I can send you the TM500 frame parts and a rear mating connector PCB free if you can cover the
padded bag shipping cost the the UK. email me off list at:
walter2 -at- sphere.bc.ca

regards,
walter
sphere research corp.

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