Date   
Re: Ths730 alternative to p5102 probe

Chuck Harris
 

For audio use, any bnc probe that can handle the voltage
will work just fine. Look at the P6007 and P6009.

-Chuck Harris

Scott Adams via Groups.Io wrote:

Most of my high voltage measurement needs are in the audio frequency range, I like to repair and build vacuum tube stereo amps.



Re: Ths730 alternative to p5102 probe

Scott Adams
 

Most of my high voltage measurement needs are in the audio frequency range, I like to repair and build vacuum tube stereo amps.

Re: Ths730 alternative to p5102 probe

Neil Gruending
 

The industry standard probes for portable oscilloscopes are made by Staubli. They are $60-$80US new and are CAT rated for these types of measurements. Allied/Farnell sells some of the models and you can buy direct if you meet the minimum order ($100US?). Their application people are also very good at matching your requirements to their probes.

Will it be a perfect high fidelity match to the THS370? Probably not but safely measuring high voltages with more than 1MHz of bandwidth can be challenging on a budget. The biggest downside of these safety rated probes are their size compared to the Tek probes although the do have some physically smaller models.

Cheers,
Neil
________________________________
From: TekScopes@groups.io <TekScopes@groups.io> on behalf of Chuck Harris via Groups.Io <cfharris=erols.com@groups.io>
Sent: October 15, 2019 6:52 AM
To: TekScopes@groups.io <TekScopes@groups.io>
Subject: Re: [TekScopes] Ths730 alternative to p5102 probe

The usual rule of thumb is unless your probes are
specifically designed for high voltages, don't subject
your probes to any voltage higher than your scope's
input rating.

So, don't skimp on the probes that are going to protect
you and your scope.

I tend to use P6007's (1.5KV, 25MHz), P6009's (1.5KV, 100MHz),
and P6015's(20KV, 75MHz) for HV applications. The 6007's and
6009's are usually pretty cheap.

Virtually all of the modular, high performance, probes are
rated for less than 400V.

Remember most probes HV rating is for *DC*, or low freq AC,
not RF HV! RF HV is a whole 'nother kettle of fish.

-Chuck Harris


Scott Adams via Groups.Io wrote:
I have a ths730 and want to do measurements on vacuum tube amp circuits that have between 240vdc to 500vdc. I was wondering if there are any recommended alternatives to the p5102 probes, these this sell between $250 to $600 on fleabag.



Right angle extender board, CG50XX...

Chuck Harris
 

Hi,

I am in the middle of a frustrating intermittent problem
with a CG5011, and need a right angle extender board for
lifting the internal pc boards out of their slots.

Anybody have a spare, or know where I can get one?

It is tek part number: 067-0975-00

It is a fairly simple double sided adapter with a 30 pin
0.1" spacing connector.

I've thought about making one, but it would be easier if
I could buy one.

-Chuck Harris

Re: "liquid crystal driver" sighting

Vince Vielhaber
 

It's $56 shipping across the US or I would've.

Vince.

On 10/15/2019 07:29 PM, Craig Sawyers wrote:
At $22 BIN I'm surprised no one in the US has taken a punt just to find out what that plugin does!

The thing that puts me off doing precisely that is $104 shipping to the UK!!!

Craig

This "lot of 3" item on eBay includes a couple of 5A1xN scope plugins and a "liquid crystal driver"
plugin:

https://www.ebay.com/itm/LOT-OF-3-TEKTRONIX-PLUG-IN-5A18N-DUAL-TRACE-AMP-5A15N-AMP-
LIQUID-CRYSTAL-DRIVER/312803078179

The only mentions of a "liquid crystal driver" plugin that I've found are in Dennis T's list of
TM500/TM5000 plugins at davmar.org & TekWiki.

The eBay listing has crude front & back pictures. I might get around to adding the pix to TekWiki.
Feel
free to beat me to it.

Just for curiosity, does anyone here know anything about this mysterious object?


Re: "liquid crystal driver" sighting

Craig Sawyers
 

At $22 BIN I'm surprised no one in the US has taken a punt just to find out what that plugin does!

The thing that puts me off doing precisely that is $104 shipping to the UK!!!

Craig

This "lot of 3" item on eBay includes a couple of 5A1xN scope plugins and a "liquid crystal driver"
plugin:

https://www.ebay.com/itm/LOT-OF-3-TEKTRONIX-PLUG-IN-5A18N-DUAL-TRACE-AMP-5A15N-AMP-
LIQUID-CRYSTAL-DRIVER/312803078179

The only mentions of a "liquid crystal driver" plugin that I've found are in Dennis T's list of
TM500/TM5000 plugins at davmar.org & TekWiki.

The eBay listing has crude front & back pictures. I might get around to adding the pix to TekWiki.
Feel
free to beat me to it.

Just for curiosity, does anyone here know anything about this mysterious object?

"liquid crystal driver" sighting

p mc
 

This "lot of 3" item on eBay includes a couple of 5A1xN scope plugins and a "liquid crystal driver" plugin:

https://www.ebay.com/itm/LOT-OF-3-TEKTRONIX-PLUG-IN-5A18N-DUAL-TRACE-AMP-5A15N-AMP-LIQUID-CRYSTAL-DRIVER/312803078179

The only mentions of a "liquid crystal driver" plugin that I've found are in Dennis T's list of TM500/TM5000 plugins at davmar.org & TekWiki.

The eBay listing has crude front & back pictures. I might get around to adding the pix to TekWiki. Feel free to beat me to it.

Just for curiosity, does anyone here know anything about this mysterious object?

Re: 2465A Repair Question

Chuck Harris
 

Good point Raymond. Installing the stab connector at
a slight angle to vertical, can wipe the spring right
out of the mating connector.

Stab connectors are made for only a couple of mating
cycles over their entire lifetime.

It would be a good idea to do a continuity check on
the pins of this stab connector before going much
farther.

-Chuck Harris

Raymond Domp Frank wrote:

On Mon, Oct 14, 2019 at 01:23 AM, Chuck Harris wrote:


The Feedback signal from U1371C leaves the one circuit board, and
passes through the "stab" connectors to the other circuit board.
A while ago, I worked on a 2465B which behaved funnily. Turned out several of these "stab" connectors were missing the tiny spring in the square bushings, resulting in intermittent contact.

Raymond

Re: Tek 492xx 492BP Calibration Test Cable, How long?

Konrad Roeder -- WA4OSH
 

Thanks.  I'm just getting used to the new ( for me ) spec-an.  Sent from my T-Mobile 4G LTE Device

-------- Original message --------From: Sergey Kubushyn <ksi@...> Date: 10/15/19 8:03 AM (GMT-08:00) To: TekScopes@groups.io Subject: Re: [TekScopes] Tek 492xx 492BP Calibration Test Cable, How long? On Mon, 14 Oct 2019, Konrad Roeder -- WA4OSH wrote:Just checked on my 494AP. Nothing after first band.> Sergey,> So it is the output of a comb generator with harmonics from 100 MHz up> through the first band.  I don't see it on the rest of the bands.  Is this> normal?>> This is the cal output on an HP/Agilent 859x Spec-an.   Same idea.  The> first carrier is at 300MHz, -20dBm.  The rest follow a well known power> output pattern caused by the step recovery diode.> --Konrad, WA4OSH>> On Mon, Oct 14, 2019 at 10:07 AM Sergey Kubushyn <ksi@...> wrote:>>> On Mon, 14 Oct 2019, Konrad Roeder -- WA4OSH wrote:>>>> Yep, it is not dirty, it is specifically done this way so you can see>> harmonics as 100MHz marks. And yes, fundamental is calibrated to a known>> power, -20dBm as I recall.>>>>> Sergey,>>> Thanks for the explanation.>>>>>> The 100 MHz has harmonics all the way out to 1.8 GHz.  It looks like a>> comb>>> generator out with lots of harmonics for the full band 0.  This is normal>>> according to the screen pics.  I have not looked at the cal output on a>>> scope yet.  It it just a dirty 100 MHz reference oscillator with lots of>>> harmonics where the fundamental output power is calibrated to a known>> level?>>>>>> --Konrad, WA4OSH>>>>>>>>> On Mon, Oct 14, 2019 at 7:57 AM Sergey Kubushyn <ksi@...> wrote:>>>>>>> On Fri, 11 Oct 2019, Konrad Roeder -- WA4OSH wrote:>>>>>>>>> I just bought a tek 492BP.  It came without the cal test cable.>>>>>>>>>> Q:  In order to do a calibration there's a 50 ohm BNC-N cable that goes>>>>> from the Cal out BNC jack to the RF Input N jack. How long is that>> cable>>>>> end-to-end?>>>>>>>> It doesn't actually matter. Just use something of a reasonable length.>> It>>>> is>>>> 100MHz cable so nothing serious there. There are harmonics that can be>>>> clearly seen but calibrated amplitude only applies to the fundamental,>>>> 100MHz.>>>>>>>>>> -->>> Best,>>> Konrad>>>>>> Konrad Roeder>>> 425-444-0595 Cell>>> 425-256-2144 Home---*******************************************************************  KSI@home    KOI8 Net  < >  The impossible we do immediately.  **  Las Vegas   NV, USA   < >  Miracles require 24-hour notice.   *******************************************************************

Re: 2465A Repair Question

 

On Mon, Oct 14, 2019 at 01:23 AM, Chuck Harris wrote:


The Feedback signal from U1371C leaves the one circuit board, and
passes through the "stab" connectors to the other circuit board.
A while ago, I worked on a 2465B which behaved funnily. Turned out several of these "stab" connectors were missing the tiny spring in the square bushings, resulting in intermittent contact.

Raymond

Re: Tek 492xx 492BP Calibration Test Cable, How long?

Sergey Kubushyn
 

On Mon, 14 Oct 2019, Konrad Roeder -- WA4OSH wrote:

Just checked on my 494AP. Nothing after first band.

Sergey,
So it is the output of a comb generator with harmonics from 100 MHz up
through the first band. I don't see it on the rest of the bands. Is this
normal?

This is the cal output on an HP/Agilent 859x Spec-an. Same idea. The
first carrier is at 300MHz, -20dBm. The rest follow a well known power
output pattern caused by the step recovery diode.
--Konrad, WA4OSH

On Mon, Oct 14, 2019 at 10:07 AM Sergey Kubushyn <ksi@...> wrote:

On Mon, 14 Oct 2019, Konrad Roeder -- WA4OSH wrote:

Yep, it is not dirty, it is specifically done this way so you can see
harmonics as 100MHz marks. And yes, fundamental is calibrated to a known
power, -20dBm as I recall.

Sergey,
Thanks for the explanation.

The 100 MHz has harmonics all the way out to 1.8 GHz. It looks like a
comb
generator out with lots of harmonics for the full band 0. This is normal
according to the screen pics. I have not looked at the cal output on a
scope yet. It it just a dirty 100 MHz reference oscillator with lots of
harmonics where the fundamental output power is calibrated to a known
level?

--Konrad, WA4OSH


On Mon, Oct 14, 2019 at 7:57 AM Sergey Kubushyn <ksi@...> wrote:

On Fri, 11 Oct 2019, Konrad Roeder -- WA4OSH wrote:

I just bought a tek 492BP. It came without the cal test cable.

Q: In order to do a calibration there's a 50 ohm BNC-N cable that goes
from the Cal out BNC jack to the RF Input N jack. How long is that
cable
end-to-end?
It doesn't actually matter. Just use something of a reasonable length.
It
is
100MHz cable so nothing serious there. There are harmonics that can be
clearly seen but calibrated amplitude only applies to the fundamental,
100MHz.
--
Best,
Konrad

Konrad Roeder
425-444-0595 Cell
425-256-2144 Home
---
******************************************************************
* KSI@home KOI8 Net < > The impossible we do immediately. *
* Las Vegas NV, USA < > Miracles require 24-hour notice. *
******************************************************************

Re: tektronics 2465b 400mhz nvram battery info

 

I did my service about a few years ago shortly after machine guy did his....here;s the docs regarding it...I used a non standard Tadiran battery which worked fine....pics included.
https://hackaday.io/project/163890-tektronix-2465-series-servicing

Re: Ths730 alternative to p5102 probe

Chuck Harris
 

The usual rule of thumb is unless your probes are
specifically designed for high voltages, don't subject
your probes to any voltage higher than your scope's
input rating.

So, don't skimp on the probes that are going to protect
you and your scope.

I tend to use P6007's (1.5KV, 25MHz), P6009's (1.5KV, 100MHz),
and P6015's(20KV, 75MHz) for HV applications. The 6007's and
6009's are usually pretty cheap.

Virtually all of the modular, high performance, probes are
rated for less than 400V.

Remember most probes HV rating is for *DC*, or low freq AC,
not RF HV! RF HV is a whole 'nother kettle of fish.

-Chuck Harris


Scott Adams via Groups.Io wrote:

I have a ths730 and want to do measurements on vacuum tube amp circuits that have between 240vdc to 500vdc. I was wondering if there are any recommended alternatives to the p5102 probes, these this sell between $250 to $600 on fleabag.



Ths730 alternative to p5102 probe

Scott Adams
 

I have a ths730 and want to do measurements on vacuum tube amp circuits that have between 240vdc to 500vdc. I was wondering if there are any recommended alternatives to the p5102 probes, these this sell between $250 to $600 on fleabag.

Re: ths730a battery cover stuck

Scott Adams
 

OK, used a set of pliers and was able to work the cover free, seems to work fine now. Bonus, found out the person I got this from had changed the batteries out for NiMH and modified it so that it charges regular NiMH in place, the batteries are not made into a battery pack just 4 loose c-cell NiMH batteries. These are the small tenergy so do not last long, I have ordered 2 sets of their premium 5000mah batteries yi see ifmi can get more time out of them.

Re: Chart Recorder and Its Replacement

paul.delamusica@...
 

Thanks! After reading your post, I looked for and found a separate connector that does provide the START signal and a RESPOOL signal for overlay plotting.

Re: Chart Recorder and Its Replacement

Daniel Koller
 

Hmmm....  I can't think of any specific instruments that I have that do this, but I have used some in the past.  But in general, one outputs to an X-Y recorder, to be specific.  The only functions the instrument needs to output are X-out, Y-out and Pen_Down.   Most if not all HP X-Y recorders have a Pen-Down pin on a rear connector.  The output from the instrument is then generated with simple vector graphics.
  I suppose you could use a strip-chart recorder with time as the X-axis for things like scope plots, but then you need an appropriate sweep speed and instead of a pen_down line, you need a sweep_enable line.   Various strip chart recorders also have such a feature as an external input.  You could sync a very slow sweep from an oscilloscope to the chart recorder.  
  If, for example, you wanted to output the trace of a 545 oscilloscope, for a slow sweep (one taking a few seconds to sweep the screen) you could do it two ways.  1) Connect the sweep output to the X input of an X-Y recorder, the Vertical signal Out to the Y input, scale both accordingly, and connect the A gate output to the Pen_down line.    OR, you could use a strip chart recorder.  Connect the A gate to the sweep_enable function, and the Vertical output to Y in.  
Dan

On Monday, October 14, 2019, 11:19:36 PM EDT, paul.delamusica@... <paul.delamusica@...> wrote:

I apologize in advance for this question not being specific to Tektronix. But I think many of you are familiar with what I am about to ask.

In old instruments, the output is often send out to a chart recorder. The signal is typically sent through two connectors, one of them is kept at ground. I suppose the recorder would need special signals for "start recording" and "end recording". Can someone explain how this is done?

Thanks.

Chart Recorder and Its Replacement

paul.delamusica@...
 

I apologize in advance for this question not being specific to Tektronix. But I think many of you are familiar with what I am about to ask.

In old instruments, the output is often send out to a chart recorder. The signal is typically sent through two connectors, one of them is kept at ground. I suppose the recorder would need special signals for "start recording" and "end recording". Can someone explain how this is done?

Thanks.

Re: Manual cover material source

ken chalfant
 

Greetings,

While I don’t know the answer there might be a way to figure it out - or get help finding your answer.

If there is a “real” print house in your town - not a Staples or FedEx office printing place - but a real offset photolithography printing shop with real printing presses they may be able to help.

They will easily be able to tell you the weight of the cover stock. It may be possible for them to identify the texture of the cover stock as well.

The industry standard for printing ink colors is the Pantone book. There are actually several different versions of these books and cover virtually every color available. It should be possible to match the cover color to a Pantone number.

Armed with that information it may be possible to find this cover stock and buy it by the ream. A ream of heavy cover stock may be less than 500 sheets.

Once you have found a real print shop if it becomes clear the original stock is not available the print shop might be able to recreate it and make a small run.

Hope this helps.

Good hunting!

Regards,

Ken

On 14Oct, 2019, at 2:24 PM, Errick <@ELW> wrote:

Does anyone know what material Tektronix used for the covers of the manuals. I am looking for material for the two tone blue cover: dark and medium blue that has sort-of a wrinkle finish and on the inside is a medium blue with a matte finish. I am working on coping my manuals so I can preserve the originals.


Tektronix instruments large filter capacitors NOS

Craig Cramb
 

I have some spare pieces that are new/unused that I would like to sell.
Sprague, Mallory, Aerovox, GE

If interested please Contact: @Manfromtrane

Capacitors for the 455,465,475,465M series oscilloscope
#290-0584-00. 5500 mfd. 30vdc.
#290-0683-00. 1200uf. 100vdc.
#290-0571-00. 5000uf. 25vdc.
#290-0670-00. 550uf. 100vdc
#290-0583-00. 3000uf 35vdc
#290-0585-00. 350uf. 75vdc
#290-0586-00. 1000uf. 75vdc
#29-0508-00. 18000uf 15vdc


Capacitors for other instruments
#290-0810-00. 18000uf. 25wvdc
#290-0590-00. 3000uf 50wvdc
#290-0587-00. 170uf. 275vdc
#290-0645-00. 10000uf. 12vdc
#290-0122-00. 1000uf 50vdc
#290-0017-00. 125uf. 450vdc
#290-0568-00. 4500uf. 25vdc
#290-0015-00. 125uf. 350vdc
#290-0197-00. Dual cap 250. 350vdc. 40uf 250vdc
#290-0224-00. Dual cap 340uf 250vdc. 10uf 250vdc
#290-0126-00. Triple cap 10uf 350vdc. 50uf 150vdc. 100uf 50vdc