Re: Input from or challange for the experts amongts us (or Brain Candy) whichever ti
Some things you ask about are easier than others.
* The 7CT1N has no readout capability (hence the N suffix). It wouldn't be
practical (or even possible) to add it unless you had the ability to make
some custom cam switches if the room existed in the plugin (which I doubt).
* The readout information can be captured via the GPIB interface of the 7854
and there are GPIB to USB adapters around but the hardware and software
complexity of doing this is another matter.
* You can use any Tek curve tracer (including the 7CT1N) to measure the
relative quality of a capacitor but it requires a known good sample to
compare to. All Tek curve tracers display voltage vs. current and a
capacitor will respond to the voltage applied across it with a
characteristic current flow. The result is an oval because voltage and
current are out of phase in a cap. A bad cap with high ESR will have far
less current for a given voltage. By comparing a good cap to the unknown you
can get a relative idea of its quality. Look through the TekScope archives
for lots of things you can do with a curve tracer besides measure
semiconductors.
* ESR meters such as the Dick Smith ESR meter and others like it use pulses
to measure the ESR. It is all well explained in the theory of operation for
the Dick Smith ESR Manual which you should be able to fine on the web. One
advantage of this method is it cam measure the ESR of a cap in circuit. You
can buy a good ESR meter on eBay for ~$100 which would be far less than the
cost (in time) of making one.
Dennis
toggle quoted message
Show quoted text
-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] On Behalf
Of doswoodman@...
Sent: Sunday, May 20, 2012 5:52 PM
To: TekScopes@...
Subject: [TekScopes] Input from or challange for the experts amongts us (or
Brain Candy) whichever ti
As a guess anyone recognizing my name/posts would know I am making a hobby
out of refurbishing/rebuilding a few 7000 series scopes and plug-ins.
As I have been doing so I have become more and more enamored (for lack of
better wording) with the design and nuances of the technology. I suppose
this is because it is so well documented and I can understand it and fix it,
etc. (As an old technician w/o being anything close to a double E., etc. )
In any event, I have started thinking (which my wife tells me is dangerous).
What would it take to either modify say a 7D13 or a 7A17 so that a person
could make an ESR plug-in that would display meaningful information via the
Readout system? In the same vein could a system be developed similar to a
7CT1 that would give meaningful information via the scope traces (if so what
plug-in would it be based off of). Showing if a specific capacitor is good
bad or indifferent *in circuit or out ?*. Finally, would it be possible (or
has it already been done) to make an interface say via RS-232 or USB or? so
that a person could capture both the trace and readout system information on
a PC.
Obviously I do not have the expertise to make any of this happen. I just
wanted to have kind of a forum wide discussion on:
1.) Is it possible
2.) What would it take
3.) Would it have any value beyond the obvious..... in that.... similar to
mountain climbing doing it because we can and/or because it's there....
4.) Where a person like me may go to research the possibility, etc.
I apologize in advance if this is to open-ended or too far afield of
'topic'. If either be the case please provide feedback and I will table the
line of thought.
Thanks in advance for any and all thoughts/feedback.
Rob
P.S. I do have the technical information on the card slot pin-outs, readout
system letter values, etc. but would not know how to translate that to any
circuitry, etc. (other than troubleshooting if it was broken as the manuals
do a good job of explanation, etc.)
------------------------------------
Yahoo! Groups Links
|
Re: Input from or challange for the experts amongts us (or Brain Candy) whichever ti
To download trace information from a scope you need some way of digitizing the signal. That is why downloading of traces are usually only supported by digital scopes and not analog scopes.
--Victor
toggle quoted message
Show quoted text
--- In TekScopes@..., "doswoodman@..." <rgwood@...> wrote:
As a guess anyone recognizing my name/posts would know I am making a hobby out of refurbishing/rebuilding a few 7000 series scopes and plug-ins.
As I have been doing so I have become more and more enamored (for lack of better wording) with the design and nuances of the technology. I suppose this is because it is so well documented and I can understand it and fix it, etc. (As an old technician w/o being anything close to a double E., etc. )
In any event, I have started thinking (which my wife tells me is dangerous). What would it take to either modify say a 7D13 or a 7A17 so that a person could make an ESR plug-in that would display meaningful information via the Readout system? In the same vein could a system be developed similar to a 7CT1 that would give meaningful information via the scope traces (if so what plug-in would it be based off of). Showing if a specific capacitor is good bad or indifferent *in circuit or out ?*. Finally, would it be possible (or has it already been done) to make an interface say via RS-232 or USB or? so that a person could capture both the trace and readout system information on a PC.
Obviously I do not have the expertise to make any of this happen. I just wanted to have kind of a forum wide discussion on:
1.) Is it possible
2.) What would it take
3.) Would it have any value beyond the obvious..... in that.... similar to mountain climbing doing it because we can and/or because it's there....
4.) Where a person like me may go to research the possibility, etc.
I apologize in advance if this is to open-ended or too far afield of 'topic'. If either be the case please provide feedback and I will table the line of thought.
Thanks in advance for any and all thoughts/feedback.
Rob
P.S. I do have the technical information on the card slot pin-outs, readout system letter values, etc. but would not know how to translate that to any circuitry, etc. (other than troubleshooting if it was broken as the manuals do a good job of explanation, etc.)
|
Input from or challange for the experts amongts us (or Brain Candy) whichever ti
As a guess anyone recognizing my name/posts would know I am making a hobby out of refurbishing/rebuilding a few 7000 series scopes and plug-ins.
As I have been doing so I have become more and more enamored (for lack of better wording) with the design and nuances of the technology. I suppose this is because it is so well documented and I can understand it and fix it, etc. (As an old technician w/o being anything close to a double E., etc. )
In any event, I have started thinking (which my wife tells me is dangerous). What would it take to either modify say a 7D13 or a 7A17 so that a person could make an ESR plug-in that would display meaningful information via the Readout system? In the same vein could a system be developed similar to a 7CT1 that would give meaningful information via the scope traces (if so what plug-in would it be based off of). Showing if a specific capacitor is good bad or indifferent *in circuit or out ?*. Finally, would it be possible (or has it already been done) to make an interface say via RS-232 or USB or? so that a person could capture both the trace and readout system information on a PC.
Obviously I do not have the expertise to make any of this happen. I just wanted to have kind of a forum wide discussion on:
1.) Is it possible
2.) What would it take
3.) Would it have any value beyond the obvious..... in that.... similar to mountain climbing doing it because we can and/or because it's there....
4.) Where a person like me may go to research the possibility, etc.
I apologize in advance if this is to open-ended or too far afield of 'topic'. If either be the case please provide feedback and I will table the line of thought.
Thanks in advance for any and all thoughts/feedback.
Rob
P.S. I do have the technical information on the card slot pin-outs, readout system letter values, etc. but would not know how to translate that to any circuitry, etc. (other than troubleshooting if it was broken as the manuals do a good job of explanation, etc.)
|
468 can't have a DM44, but the cover should fit just fine.
-ls-
Kevin Berlen <kberlen@...> wrote:
toggle quoted message
Show quoted text
I need to know if a cover for a 468 will fit on a 465B. both scopes
appear to have the DM44 option. Thanks,
Kevin
------------------------------------
Yahoo! Groups Links
|
Re: 2465A - Change vertical indicator
Oops, I realized that a couple of minutes after posting. You would
have to use a negative resistor :)
toggle quoted message
Show quoted text
On Sun, May 20, 2012 at 5:48 PM, <larrys@...> wrote: I don't think you can get there that way. ?The coding ring resistors
add orders of magnitude of attenuation. ?He wants to move it the
other direction.
-ls-
David DiGiacomo <daviddigiacomo@...> wrote:
On Sat, May 19, 2012 at 3:29 PM, branadic
<branadic@...> wrote:
I've build a 60dB, 10Hz - 100kHz low noise preamp. It now would be nice to change vertical scale indicator for example from 2mV/div to
2?V/div. Is there a possibility known how to do this?
I think the readout scale factors only go up to 100X, but you can
connect a pot or decade box from the probe coding ring to ground, and
see for yourself.
------------------------------------
Yahoo! Groups Links
|
I need to know if a cover for a 468 will fit on a 465B. both scopes appear to have the DM44 option. Thanks,
Kevin
|
Re: 2465A - Change vertical indicator
I don't think you can get there that way. The coding ring resistors
add orders of magnitude of attenuation. He wants to move it the
other direction.
-ls-
David DiGiacomo <daviddigiacomo@...> wrote:
toggle quoted message
Show quoted text
On Sat, May 19, 2012 at 3:29 PM, branadic
<branadic@...> wrote:
I've build a 60dB, 10Hz - 100kHz low noise preamp. It now would be nice to change vertical scale indicator for example from 2mV/div to
2?V/div. Is there a possibility known how to do this?
I think the readout scale factors only go up to 100X, but you can
connect a pot or decade box from the probe coding ring to ground, and
see for yourself.
|
Re: 2465A - Change vertical indicator
On Sat, May 19, 2012 at 3:29 PM, branadic <branadic@...> wrote: I've build a 60dB, 10Hz - 100kHz low noise preamp. It now would be nice to change vertical scale indicator for example from 2mV/div to 2?V/div. Is there a possibility known how to do this? I think the readout scale factors only go up to 100X, but you can connect a pot or decade box from the probe coding ring to ground, and see for yourself.
|
Re: Speaking of curve tracers [3 Attachments]
There's a Measurements Concepts PDF book out there. ? "Semiconductor
Device Measurements" by John Mulvey that has all sorts of measurements
you can make using a curve tracer. ? Its pretty generic, and not
specific to any certain tracer. ? Unsurprisingly its semiconductor
specific, and does not have any specific vacuum tube section. ? I've
forgotten where I picked my copy of the PDF up, but thanks to whomever
had it posted. It was scanned by Al Kossow, but I have it available also:
|
Re: scanned: Tektronix New Products, March 1972
Nice walk down memory lane,
Michael
toggle quoted message
Show quoted text
--- In TekScopes@..., "sipespresso" <sipespresso@...> wrote:
Enjoy.
-Kurt
|
scanned: Tektronix New Products, March 1972
|
Tek 1960's power lead / Nuvistor wanted
I'm trying to get a very early 453 (IBM) working. It came with no mains lead,(3-pin round socket) and one of the input Nuvistors (8393) seems to be dead. If anyone happens to have either item in their spares collection, I'd be happy to purchase. I'm in the UK (London)
John
|
I have had sometime to check out the LD110ACJ and LD111ACJ as well as the LD121ACJ I did not check out every chip as there was no reason to.
?All the chips were the correct part and worked in every respect as far as I can tell.
?UT source seems to be a good company to deal with as far as I can tell. this was my second order it takes about? 2 weeks to get the parts since they are in China.
Regards
Dave
N9ooq
|
|
Re: Testing Vacuum Tubes with a Tektronix Model 576 Semiconductor Curve Tracer...
YES!
?
Unfortunately, the pictures aren't there, and I can't seem to be able to find Part Two on how to modify the 576 for the job.
?
Thank's a lot,
?
Jim
|
--- On Sun, 5/20/12, glydeck@... wrote:
From: glydeck@...
Subject: Re: [TekScopes] Re: Testing Vacuum Tubes with a Tektronix Model 576 Semiconductor Curve Tracer...
To: TekScopes@...
Date: Sunday, May 20, 2012, 4:29 PM
?
Jim,
Let me know if this works....
http://dl.dropbox.com/u/27593700/Testing_Vacuum_Tubes_with_a_Tek576.pdf
glydeck@...
-----Original Message----- From: Jim Elliott To: TekScopes Sent: Sat, May 19, 2012 3:54 pm Subject: Re: [TekScopes] Re: Testing Vacuum Tubes with a Tektronix Model 576 Semiconductor Curve Tracer...
?
|
I'm still unable to open.? My PC keeps telling me it is an unknown file type.
?
Can you direct me to a program that will open the link?
?
Thanks again,
?
Jim
--- On Sat, 5/19/12, <> wrote:
From: <>
Subject: Re: [TekScopes] Re: Testing Vacuum Tubes with a Tektronix Model 576 Semiconductor Curve Tracer...
To:
Date: Saturday, May 19, 2012, 6:31 PM
?
The link was broken with a carriage return. ?Try this;
-----Original Message----- From: jimafm <> To: TekScopes <> Sent: Sat, May 19, 2012 12:40 pm Subject: [TekScopes] Re: Testing Vacuum Tubes with a Tektronix Model 576 Semiconductor Curve Tracer...
?
--- In , "c1ferrari" wrote:
>
>
>
> Happy New Year, all,
>
> Just wanted to report this article is unavailable on the web.
> When I re-discover, LOL, the info pertaining to power supplies -- I'll post.
>
> Best regards,
> Sam
>
> --- In , "c1ferrari" wrote:
> >
> >
> >
> > Hey Craig,
> >
> > Thanks for the reply! I'll see if I can get a link to the article with pics. I think Daniel had some suggestions for the necessary power supplies.
> >
> > Next for your
stable...Tek 570 or 370, Craig? ;-)
> >
> > Season's Greetings,
> >
> > Sam
> >
> > --- In , "Craig Sawyers" wrote:
> > >
> > > Interesting article, Sam.
> > >
> > >
> > >
> > > I have (surprise, surprise) got a 577 as well as a 575mod122C (and a regular
> > > 575 too).
> > >
> > >
> > >
> > > The key benefit of the 577 as compared with the much older 575 is that it
> > > was designed after the FET became common - hence the step amplifier on the
> > > 577 goes up to 2V per step as compared with 0.2V per step for the 575. It
> > > also (as the article points out) has a
much wider range of voltage and
> > > higher current capability than the 575 - or the 570 for that matter.
> > >
> > >
> > >
> > > However, to be fully featured, it still needs a step amplifier to get to the
> > > 10V/step needed for some of the more esoteric (audio) valves like the 300B,
> > > and the characteristic curves for things like the KT88 call for 5V steps.
> > > And a screen grid supply is also needed whatever tracer is used. And
> > > although the formal definition gm is a limit (dIa/dVg at constant Va), and
> > > that most tube testers measure with a 1V grid voltage step, you can get a
> > > surprisingly accurate result by measuring between grid voltage steps and
> > > doing the calculation on that basis. Or use the measurement method in the
> > > paper Sam attached, which should be
as accurate as the calibration of the
> > > tracer.
> > >
> > >
> > >
> > > But (given screen grid and heater supplies) it is easier to do most small
> > > signal and some power tubes with a 577 as compared with a 575mod122C for
> > > sure.
> > >
> > >
> > >
> > > Craig
> > >
> > >
> > >
> > > PS it would be good to get a link to the article including the diagrams
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > From: [mailto:] On Behalf
> > > Of Sam Lucero
> > > Sent: 23 December 2011 02:33
> > > To:
> > > Subject: [TekScopes] Testing Vacuum Tubes with a Tektronix Model 576
> > > Semiconductor Curve Tracer... [1 Attachment]
> > >
> > >
> > >
> > > [Attachment(s) from Sam Lucero included below]
> > >
> > >
> > >
> > >
> > > manuscript courtesy of its author, Daniel Schoo, is available, here, in pdf
> > > format. Please note photos have been omitted due to bandwidth requirement.
> > >
> > > Daniel furnishes the article on the condition it be distributed and
> > > reproduced
with it's original content unchanged with no editing.
> > > An accompanying article on the Tek 577 appears with it.
> > >
> > > Enjoy and Happy Holidays!
> > >
> > > Sam
> > >
> > >
> > >
> > >
> > >
> > > Attachment(s) from Sam Lucero
> > >
> > > 1 of 1 File(s)
> > >
> > > <>
> > >
> > >
> > > <
> > >
es%20with%20a%20Tek%20Model%20576%20Semiconductor%20> Testing Vacuum Tubes
> > > with a Tek Model 576 Semiconductor Curve Tracer.pdf
> > >
> >
>
The links don't work. Am I missing something?
Anyone have input on Daniel Schoo's article on using Tek 576 to test tubes?
|
|
Re: Testing Vacuum Tubes with a Tektronix Model 576 Semiconductor Curve Tracer...
Jim,
Let me know if this works....
http://dl.dropbox.com/u/27593700/Testing_Vacuum_Tubes_with_a_Tek576.pdf
toggle quoted message
Show quoted text
-----Original Message-----
From: Jim Elliott
To: TekScopes
Sent: Sat, May 19, 2012 3:54 pm
Subject: Re: [TekScopes] Re: Testing Vacuum Tubes with a Tektronix Model 576 Semiconductor Curve Tracer...
?
|
I'm still unable to open.? My PC keeps telling me it is an unknown file type.
?
Can you direct me to a program that will open the link?
?
Thanks again,
?
From: glydeck@... <glydeck@...>
Subject: Re: [TekScopes] Re: Testing Vacuum Tubes with a Tektronix Model 576 Semiconductor Curve Tracer...
To: TekScopes@...
Date: Saturday, May 19, 2012, 6:31 PM
?
The link was broken with a carriage return. ?Try this;
-----Original Message-----
From: jimafm < jimafm@...>
To: TekScopes < TekScopes@...>
Sent: Sat, May 19, 2012 12:40 pm
Subject: [TekScopes] Re: Testing Vacuum Tubes with a Tektronix Model 576 Semiconductor Curve Tracer...
?
--- In , "c1ferrari" wrote:
>
>
>
> Happy New Year, all,
>
> Just wanted to report this article is unavailable on the web.
> When I re-discover, LOL, the info pertaining to power supplies -- I'll post.
>
> Best regards,
> Sam
>
> --- In , "c1ferrari" wrote:
> >
> >
> >
> > Hey Craig,
> >
> > Thanks for the reply! I'll see if I can get a link to the article with pics. I think Daniel had some
suggestions for the necessary power supplies.
> >
> > Next for your stable...Tek 570 or 370, Craig? ;-)
> >
> > Season's Greetings,
> >
> > Sam
> >
> > --- In , "Craig Sawyers" wrote:
> > >
> > > Interesting article, Sam.
> > >
> > >
> > >
> > > I have (surprise, surprise) got a 577 as well as a 575mod122C (and a regular
> > > 575 too).
> > >
> > >
> > >
> > > The key benefit of the 577 as compared with the much older 575 is that it
> > > was designed after the FET became common - hence the step amplifier on the
> > >
577 goes up to 2V per step as compared with 0.2V per step for the 575. It
> > > also (as the article points out) has a much wider range of voltage and
> > > higher current capability than the 575 - or the 570 for that matter.
> > >
> > >
> > >
> > > However, to be fully featured, it still needs a step amplifier to get to the
> > > 10V/step needed for some of the more esoteric (audio) valves like the 300B,
> > > and the characteristic curves for things like the KT88 call for 5V steps.
> > > And a screen grid supply is also needed whatever tracer is used. And
> > > although the formal definition gm is a limit (dIa/dVg at constant Va), and
> > > that most tube testers measure with a 1V grid voltage step, you can get a
> > > surprisingly accurate result by measuring between grid voltage steps and
> >
> doing the calculation on that basis. Or use the measurement method in the
> > > paper Sam attached, which should be as accurate as the calibration of the
> > > tracer.
> > >
> > >
> > >
> > > But (given screen grid and heater supplies) it is easier to do most small
> > > signal and some power tubes with a 577 as compared with a 575mod122C for
> > > sure.
> > >
> > >
> > >
> > > Craig
> > >
> > >
> > >
> > > PS it would be good to get a link to the article including the diagrams
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > From: [mailto:] On Behalf
> > > Of Sam Lucero
> > > Sent: 23 December 2011 02:33
> > > To:
> > > Subject: [TekScopes] Testing Vacuum Tubes with a Tektronix Model 576
> > > Semiconductor Curve Tracer... [1 Attachment]
> > >
> > >
> > >
> > > [Attachment(s) from Sam Lucero included below]
> > >
> > >
> > >
> > >
> > > manuscript courtesy of its
author, Daniel Schoo, is available, here, in pdf
> > > format. Please note photos have been omitted due to bandwidth requirement.
> > >
> > > Daniel furnishes the article on the condition it be distributed and
> > > reproduced with it's original content unchanged with no editing.
> > > An accompanying article on the Tek 577 appears with it.
> > >
> > > Enjoy and Happy Holidays!
> > >
> > > Sam
> > >
> > >
> > >
> > >
> > >
> > > Attachment(s) from Sam Lucero
> > >
> > > 1 of 1 File(s)
> > >
> > > <>
> > >
> > >
>
> > <
> > > es%20with%20a%20Tek%20Model%20576%20Semiconductor%20> Testing Vacuum Tubes
> > > with a Tek Model 576 Semiconductor Curve Tracer.pdf
> > >
> >
>
The links don't work. Am I missing something?
Anyone have input on Daniel Schoo's article on using Tek 576 to test tubes?
|
|
It seems that at least the first two pictures use the same sweep knob setting, 5 us/div. Also all 4 pictures seem to show the same distortion, a square wave like distortion, synchronous to the triangle, 8(?) times the frequency. What happens with other time base settings and other amplitudes for the same triangle frequency? What happens without cabling but input set to AC or DC (not to GND)? Can you trigger on the distorting "noise"? What happens at other sensitivities?
Albert
toggle quoted message
Show quoted text
--- In TekScopes@..., David <davidwhess@...> wrote:
You have a function generator that goes to 50MHz and 100Mhz?
Your pictures are not labeled and it is not clear what your
oscilloscope's vertical deflection and sweep speed are set to so I am
not sure what I am looking at.
On Sun, 20 May 2012 03:21:34 -0000, "rebelliouszombie"
<santosismael@...> wrote:
I posted more pictures in my album (rebelliouszombie_album). I connected the oscilloscope to the function generator using BNC adapters. The function generator is generating a sine wave at 100kHz, 50MHz, and 100MHz. You can see that the traces are very noisy.
I'll check the bandwidth limiter and the coupling and report back. Thanks.
|
Re: Backwards Vacuum Tube Curves Photo
Actually, I found that photo on a forum.
?
I'll try to find it again and contact the guy.
?
I couldn't figure it out either, unless he rewired the CRT! |
|
Re: 2465A - Change vertical indicator
Is there noone with an idea of how vertical scale indicator can be superposed by an external scale indicator?
branadic
|
Re: First avalanche pulser and 7A26
Hello Fabio,
there was a discussion in a german forum about UWB-Signals:
At the nearly end there are some simulations to the influence of pulse shape.
If you are interested, I have a few pictures of my Avalanche pulser directly build in SMT on a BNC female connector with the corresponding scope pictures (Tek5104B), some of them are shown in the mentioned link.
I've tried different capacitor types (ceramic, Glimmer) but also the use of a short piece of semi rigid and found no differences in pulse shape.
I had to use a 20dB attenuator between pulser and scope, because the pulse amplitude is very high and saturated the preamp of the scope.
branadic
|
Backwards Vacuum Tube Curves Photo
Jim,
What did you do to create that screen shot you labeled "Backwards" of the
vacuum tube curves that you uploaded to the 576 Curve Tracer album. I have
tried several ways in my head to figure out how you did it with no success.
Dennis
toggle quoted message
Show quoted text
-----Original Message-----
From: jimafm, Sent: Saturday, May 19, 2012 12:41 PM
|
John Sykes
Glydeck