Date   

Re: Photo Notifications #photo-notice

Eric
 

These photos are a mix of Leds and tek stock lamps. The bottom Module has been replaced. As there was a test it is an incredibly brute force method. As for the procedure of replacement it is as simple as switching out a lamp. I used a 3mm soft white LED to get a high forward voltage. I have not found a place to add a current limiting resister so I was doing the current limit with front control of the 576. The lamps use a 5V buss and the grounds are switched for the control that that is convenient for the mod.

I think this is the LED that I have in there
QBL7IW60D-WW.

It is convient to have a 3.1V forward to drop a LOT of the voltage with out burning out the LED. As evident by the pictures the LEDS are bright. At 3mm they will fit in to the existing light pipe holes In the photos I have just used the intensity controls to adjust the brightness of the leds and the lamps no other mods have been done to the board. I would like to fine out if there is a global current limit resister that could be adjusted to protect the LEDS from a careless tech. cranking the knob to high. I also checked that green leds worked as well but I only had 2 or 3 for a proof of concept.

Eric

-----Original Message-----
From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of -
Sent: Thursday, February 4, 2021 10:46 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] Photo Notifications #photo-notice

Are those all the same type LED but just run on different amounts of current? Can you give us the details on the LED type and the current involved and what you had to do to mount the LEDs in place of the lamps?

On Thu, Feb 4, 2021 at 7:56 PM TekScopes@groups.io Notification < noreply@groups.io> wrote:

Eric <ericsp@gmail.com> added the album Tektronix 576 Lamps Vs LED
------------------------------

The following photos have been uploaded to the Tektronix 576 Lamps Vs
LED <https://groups.io/g/TekScopes/album?id=260348> album of the
TekScopes@groups.io group.

- Led Vs Lamp 1.JPG
<https://groups.io/g/TekScopes/photofromactivity?id=3164217>
- Led Vs Lamp 2.JPG
<https://groups.io/g/TekScopes/photofromactivity?id=3164218>
- Led Vs Lamp 3.JPG
<https://groups.io/g/TekScopes/photofromactivity?id=3164219>
- Led Vs Lamp 4.JPG
<https://groups.io/g/TekScopes/photofromactivity?id=3164220>

*By:* Eric <ericsp@gmail.com>




Re: 564 handle?

Brenda
 

Hello Charles, I do not have a carry handle for your 564, as both of my 561A's, 564, 503,504, 531, 535 and 545A needs handles as well. My 561A's and 564 have it the worst as its down to the metal strip which makes it hard to move around. I do however have a push-on lever switch knob that I can part with. If you are interested in that, you can contact me off list.

Brenda


564 handle?

 

It appears that Deane Kidd's parts inventory is *still* in limbo :(
So, does anyone have a new (or good used) carrying handle for my 564, and one of those tiny push-on lever switch knobs for a 3B3?

Thanks
Charles
(At the moment: 321A, 422, 453A, 545B, two 561A, 561B, 564, 7403N)


Re: Cleaning 576 display selector switches

Michael W. Lynch
 

On Fri, Feb 5, 2021 at 10:04 AM, - wrote:


Is anyone tracking SNs and production dates of the 576s?
I am not tracking the production numbers, but I do have a pair of "bookend units". B010168 is my older unit.which shows to have several IC's with 69 and 70 Date codes. This is a very old unit. There are even some "sub-types" of these early units. The first ones used a readout unit with unmarked "custom IC's, blue IC sockets and gold plating, then some later ones use black IC sockets, clearly marked IC's and gold plating on the PC boards. Later units used a readout unit with soldered in IC's and conventional tin plated PC board. There is a schematic change on the readout units, but they are interchangeable between early and late units. Early units use gold plated PC boards and the brown potted HV Transformer, later ones use the "standard" tin plated boards and the black silicon potted HV transformer. The later units also have a brown phenolic cover over the collector supply access, while units below B270000 use an aluminum shield. My later unit B328452 is a late production unit, with IC's dated in the mid 80's. There are numerous other running changes on these units, so always refer to the parts list for the applicable serial numbers for various parts as well as schematic changes. If you have the chance, get the service manual with with the -01 suffix. This manual has the cumulative changes as well as the Calibration procedure that DOES NOT require the impossible to find "Calibration Fixture". The Type 576 lived from 1969-1990 so the number of changes and updates that were made is quite extensive.

--
Michael Lynch
Dardanelle, AR


Re: Tek 576 - step generator power amp - how to check?

Ozan
 

Hi Martin,


It seems I found the culprit... Q241, probably open. So it was the feedback
Do you still see 30V in NPN mode after changing Q241 and adjusting the "AMP BAL" to 0V at the emitter of Q241? Any behavior change after replacing Q241?

Ozan


Re: Tek 576 CT fiber optic readout lamps; replaced with LED's ?

stevenhorii
 

I am a high myope (correction near -10 diopters) and have been for years. I
started developing cataracts (I just turned 70 in 2020) probably about 25
years ago. I just had cataract surgery this past October - it was supposed
to be back in April, but COVID put it on hold. I first noticed the
cataracts when they were very small. Because I am a high myope, without my
glasses, point light sources look like round discs, not points. In those
discs, the cataracts produced black dots. I could actually monitor the
relative size of them this way. When I finally saw an ophthalmologist about
surgery, she said I should have had the surgery years ago.

They got to the size where I could “see” them when using optical
instruments with a relatively small exit pupil. It made using microscopes,
telescopes, theodolites and the other stuff I “play” with nearly impossible
- another good reason to have the surgery. It has made a dramatic
difference. I can work at computers without glasses. Since I am a
radiologist, when I am working, I am at a computer over ten hours a day,
though not continuously. The ophthalmologist recommended correcting me to
-2 diopters since that would work best with the working distance I told her
I wanted (about 12-20 inches). In this state I can even drive without
glasses now, but I don’t do it.

There are subtle changes with cataracts that happen so slowly, you tend not
to notice them. Halos and glare with bright lights are more obvious. Less
obvious is a color shift. My mother told me about this years ago after she
had her cataract surgery. I confirmed this with others who had the surgery
and then noticed it myself. The cataracts can cause a shift to the yellow
end of the visual light spectrum, likely because they absorb/scatter more
of the shorter-wavelength light (like blue). It is not like not being able
to see blue or violet, it is just a gradual color shift. Typically, surgery
is done one eye at a time. My right eye was done first and one of the
things I noticed immediately was how blue things looked - especially since
my left eye had not been done yet. The sky looked to be much more vivid
blue than with my left eye. The same for blue-colored objects.

There is a visual degradation point at which medical insurance companies
will cover the cost of the surgery - I was well past that point.

I should point out that I had lens cataracts, not corneal clouding - that’s
a different problem and requires different surgery.

So if you can see dark spots in your field of vision when using a
microscope, or like me, if out-of-focus point sources (like photographic
bokeh) show consistent dark dots in them, it is one way to self-test for
cataracts.

I recommend cataract surgery when an ophthalmologist recommends it.

On Fri, Feb 5, 2021 at 09:06 SCMenasian <scm@menasians.com> wrote:

Jim,

I don't know your age; but my eye doctor says that I am approaching "mild
cataract" territory.
While looking at an LED clock at night, I came up with a simple test for
cataracts. If I look at
the clock in total darkness, I see a halo (maybe about 5 degrees in
angular width) around the numerals.
I hypothesize that this is due to scattering in my corona. I would expect
this effect to be much stronger
for a blue LED display, when compared with a red display

Stephen Menasian






Re: Tek 576 - step generator power amp - how to check?

Ozan
 

Hi Martin,
I think I understood the current computations as a function of AD voltage - it
depends on the number of PN sections on the currents way to ground, I guess.
The schematic shows 2A full scale with 1-ohm in the emitter (R182). In positive direction there are two Vbe's (Q172 & Q180). In the negative direction there is one Vbe (Q176) between "AD" and R182. At 2A we are dropping 2V across R182. Vbe is ~ 0.6-0.7V, I used 0.7V.
In positive direction 2*0.7+2V=3.4V, in negative direction -0.7-2=-2.7V

But I didn't manage to see how you can predict the voltage range of +3.4V /
-2.7V at AD point. The preceding transistor is hanging between -75 and +12
volts...
Two extremes of drive states are when Q164 is in cutoff and Q164 is in saturation.

When Q164 is in cut off:
-75V pulls bottom node of R167, this turns on diode D165 and clamps top of R166 to -0.7V. Current through R167 is
I_R167=(-0.7V-(-75V))/(1k+38.3k)=1.89mA
Voltage at the base of Q169 is
I_R167*38.3k+(-75V)=-2.6V
At emitter of Q169 = -2.6V-0.7V=-3.3V

When Q164 in saturation:
Collector of Q164 is at 12.5V (ignore Vce_sat).
I_R167=(12.5V-(-75V))/(2.55k+1k+38.3k)=2.09mA
Voltage at the base of Q169 is
I_R167*38.3k+(-75V)=5V
At emitter of Q169 = 5V-0.7V=4.3V

This range [-3.3V, 4.3V] is larger than the range based on the calculation from the output stage [-2.7V, 3.4V] but we made several assumptions in both (Vbe=0.7V, ignore base currents, ignore Vce_sat, didn't consider drop across R171, etc) so I recommended the narrower range to be safe.


That said, I did make the current measurements on what I call the "power amp"
alone, and it corresponds quite well with your predictions:
- all the resistor in series are approx. 65 Ohms
+ 2V at AD -> 12,7 mA (9,2 mA computed)
+ 3V at AD -> 26,8 mA (24,6 mA computed)
-1,3V at AD -> 10,5 mA
- 2,3V at AD -> 25,3 mA
Vbe is ~ 0.6V-0.7V depending on current through the transistor and Is of the transistor. I assumed 0.7V, if you use 0.6V for these low currents the prediction is closer.


Its not perfectly symmetrical, but thats seems normal given the design so I
I agree this stage looks fine. Most likely offset in Q229 amp is the cause. Step 22 on page 5-17 describes the trim. If the offset is large and negative it would turn on clamp Q248 and override node "AF" (step input), producing a constant voltage in NPN mode. In PNP mode the clamp Q250 would be off but you would get an offset.

Ozan


Re: Cleaning 576 display selector switches

-
 

You must have one of the last 576s that was built. The ICs in mine are
dated 7901, 7902, 7918 and 7926. All appear to be original.

Is anyone tracking SNs and production dates of the 576s?

On Fri, Feb 5, 2021 at 3:09 AM <keith@peardrop.co.uk> wrote:

From the 7400 series ICs there are date codes of 7949 and 8009 so maybe
1980-1981?






Re: 7L13 parts needed

Joel B Walker
 

I'm sorry. The title should have been 7A13. It is difficult typing on a smart phone when my right hand is recovering from surgery after an injury to my index finger. I don't know how to edit the title in this forum.


7L13 parts needed

Joel B Walker
 

Hello all.
I have a 7A13 late version plug in that I need some knobs for. It doesn't matter to me if they are new or used, just so they are good.
V/div knob 366-1123-00
Variable V/div knob 366-1082-00
Course Comparison voltage knob 366-1084-00
The shaft and coupler are missing from the last one also, but I can make those on the lathe. Thanks for looking!


Re: Tek 576 - step generator power amp - how to check?

 

It seems I found the culprit... Q241, probably open. So it was the feedback section, thanks Ozan for your help.

I made a bunch of measurements before, leading to very different readings depending on NPN or PNP mode. Below is the collection of readings.

Thats the 4th transistor I have to change since I began repairing some days ago... and I have the impression that 3 of them were not faulty at the beginning. How can that be? Is my presence that corrosive?

cheers
Martin

----------------------------------------------------------------------------------------------------------

On the 0 Volt line:
+12V in NPN
+1V in PNP
(now its 0,000V)

The base of Q241 was reading -12V

The collector of Q235 was reading
+ 67V in NPN
+ 51V in PNP

The emitter of Q233 was reading
- 0,42V in NPN
- 0,58V in PNP, rising to -8,8V beginning at 5uA/Step until 200mA/Step


On the output of the Step Generator main amp, readings with a 3k load:
#NPN current mode:
+ 0V @ 0,05uA/Step
+ 10V @ 0,1mA/Step
+ 32V @ 0,1mA/Step (thats where my 30V came from)
+ 43V @ 0,1mA/Step
Voltages not regulated, decrease when increasing load, increase when increasing current limit.

#NPN voltage mode:
+ 30V @ all levels (thats where my 30V came from)
at 2V/Step the signal shows steps between 28 and 30V
Voltages not regulated, decrease when increasing load, increase when increasing current limit.

#PNP current mode:
approximately correct output, regulated

#PNP voltage mode:
- 10V @ 0,05V/Step, regulated
- 26V @ 2V/Step, regulated


Re: Tek 576 CT fiber optic readout lamps; replaced with LED's ?

SCMenasian
 

Jim,

I don't know your age; but my eye doctor says that I am approaching "mild cataract" territory.
While looking at an LED clock at night, I came up with a simple test for cataracts. If I look at
the clock in total darkness, I see a halo (maybe about 5 degrees in angular width) around the numerals.
I hypothesize that this is due to scattering in my corona. I would expect this effect to be much stronger
for a blue LED display, when compared with a red display

Stephen Menasian


FS: Tektronix TDS2014 Oscilloscope

Tom B
 

Hello All,

I have for sale a Tektronix TDS2014 100 MHz, 4 channel, oscilloscope.  It passes all self tests and self calibration and has a good display.  There are some cracks around the edges of the case and on a corner of the front panel. The power button has been replaced with a 3D printed button.  It does not include an option module or probes.   I cannot guarantee the calibration on this so I am selling it AS-IS.  The price is $260 plus shipping. Located in Maryland USA.

Tom Bryan
N3AJA


Re: Spectrum analyzer Tektronix 7L13 on mainframe Tektronix 7603

Attilio
 

Thanks Ed and Miguel for the help you are giving me.
Miguel, I'll send you more photos under the microscope today.
At the left end of the meandering resonator is a double comb which I think is a capacitor which is not on the schematic, the other end of the resonator is open.


Re: Spectrum analyzer Tektronix 7L13 on mainframe Tektronix 7603

Miguel Work
 

Hi Ed,

Thanks for your explanation. it is a pleasure to read it. Photos was taken by Attilio, I only have uploaded them.
I will ask to send me again more oscillator section detailed photos.

Regards!

-----Mensaje original-----
De: TekScopes@groups.io [mailto:TekScopes@groups.io] En nombre de Ed Breya via groups.io
Enviado el: viernes, 5 de febrero de 2021 6:57
Para: TekScopes@groups.io
Asunto: Re: [TekScopes] Spectrum analyzer Tektronix 7L13 on mainframe Tektronix 7603

Yesterday I looked at the pictures Miguel posted, of the module innards, and I looked at the manuals for the TR501,502,and 503. They all have nearly identical circuits for operating the LO/RF module. I'm at the farm now, so don't have the info at hand, but what I recall is that this module has the same base part number, and a different dash number for each model. The other RF modules and pieces seem to be the same in all models. So, the LO/RF module is really the only difference.

Looking at the LO physical circuit in the picture, it looks very close to the schematic shown in the manuals, except that the output to the coupler appears to be at one end of the meander line resonator, not tapped near the middle. I looked at Miguel's photo album today, and see there's a lot more nice and detailed pictures - nice photography work Miguel.

These circuits are mostly strip-line on alumina substrates, and in what I'd call the danger zone for modification. They are big enough and visible with reasonable magnification, making it very tempting to alter with fine hand tools. It's dangerous because the bond wires and parts are very delicate, so a slip up can easily ruin it. The alumina substrates are nearly impossible to safely solder to in place, limiting the types of possible modification. The other kinds of microwave circuits like PTFE type boards with soldered on parts, and the nearly microscopic scale sapphire ones, I don't consider dangerous - the bigger, board-based stuff is pretty easy to deal with, while the extremely small stuff can't readily be worked on, so I can't and don't mess with those, so they're safe from destruction by me. If you have the right tools like wire bonding machines and such, it's a different story.

Anyway, here's what I've been thinking. First, the three different LO/RF module/model types are nearly identical except for the nominal LO being 2072 MHz for the TR503, while the other two are 2095 MHz. That's about a one percent difference. Second, it could be that the the different dash numbers of the base part are almost all the same internally, with exception of the oscillator section only, being one of two different hybrid assemblies. OR, it could be that the oscillator hybrids are actually all the same, and differ only in some slight way that can be modified during assembly into the different dash versions. This would make sense, to not have to make two different complete hybrids that are so close in function, like a one percent difference in frequency. One way to do this would be to set the proper frequency during final build, by adding (like a solder gob or extra bond wires) or removing (like cutting a trim stub) something that's relatively easy to do. Since only two frequencies are involved (unless this module was used in other products too), one frequency could be "stock," and the other a simple mod. This also presume though, that these were all developed in the same time frame, with all the required application info figured out already.

It is quite common to see all sorts of extra floating or detachable stubs and such in planar microwave circuits, and evidence of "fine tuning" with cuts (even laser trimming), silver dag, solder, bond wires, added foil strips etc. So, one thing I'd look for is to see if there is any evidence of trimming on the meander line resonator - either added or subtracted. The resonator changes from meandering to straight, just past the transistor hookup. Unfortunately, the open end (the only "easy" place to tweak) is hidden under a feed-through post. What I'm thinking is that if it's possible to look closely from different angles in that area, it may show some trim features right at the end. For instance, let's say that the "stock" version is 2072 MHz. There would then be a feature where a tiny stub at the end could be cut loose, shortening the line by a certain amount, to run at 2095 MHz. If it were the other way around, then there would be an additive feature to lengthen it and go from 2095 to 2072, like a bunch of bond wires, solder, or Ag dag jumping the line end to a floating stub. Again, this is all based on my "one oscillator hybrid type" hypothesis, which could be entirely wrong, but I think it's worth a close look at that end, if possible.

So Miguel, I assume you have the actual module shown in the pictures. Is it possible to take a very close look at that line end, and report on it?

I have some other ideas that I'll put up tomorrow.

Ed







Scanned by McAfee and confirmed virus-free.
Find out more here: https://bit.ly/2zCJMrO


Re: Cleaning 576 display selector switches

Keith
 

From the 7400 series ICs there are date codes of 7949 and 8009 so maybe 1980-1981?


Re: The reason for Tek delay lines

Eric Schumacher
 

Ebay is just way to much pain for way too little gain these days.


The reason that you use ebay for "inventory reduction" is that assures you that your useful stuff is going to a ‘good home’. If you just give it away there is a very good chance that it will end up in the bin as UKers are likely to say. The price tells us what others value our treasure at. One of the best features of ebay is that you don't have to price your stuff, the market will do it for you.

Just my experience. Eric WB6KCN



-----Original Message-----
From: TekScopes@groups.io [mailto:TekScopes@groups.io] On Behalf Of Jim Ford
Sent: Thursday, February 4, 2021 8:48 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] The reason for Tek delay lines



Well, Bert, I just this week sent my wife an email with

TekScopes@groups.io and HP-Agilent-Keysight-equipment@groups.io and my

test equipment inventory list in it. In case of my demise, I've

instructed her to post to both groups and ask for people to come buy my

stuff. I trust you guys (and gals) in advance to give my widow a

reasonable price. It was actually really simple and easy, and now my

mind is at ease about my stuff when I'm gone. I encourage others to do

the same.



Jim Ford



------ Original Message ------

From: "Bert Haskins" <bhaskins@chartermi.net>

To: TekScopes@groups.io

Sent: 2/4/2021 7:35:26 AM

Subject: Re: [TekScopes] The reason for Tek delay lines



On 2/4/2021 12:05 AM, Ed Breya via groups.io wrote:
Magnetostrictive delay lines are suitable for low speed AC signals, providing acoustic delay - they were good for early computer equivalent of DRAM (with re-circulation), before practical large solid state memory arose, but not for scopes.
Ed
Yep, and I still have at least one of those on one of my far back shelves along most of the old processors, 2102 and ttl memory and such.
The delay line was at the very heart of a Westinghouse NC controller.
Hard to believe but some of that stuff is still out there running on industrial controllers.
Someday all of thiswill just go out to a recycler along with my machine shop stuff.
Ebay is just way to much pain for way too little gain these days.
Bert


Re: Tek 576 - step generator power amp - how to check?

 

Hi Ozan,

thanks a lot for all these insights - it helps clearing up the fog in my head.

I admire how you get all these numbers by looking at the schematic alone. I think I understood the current computations as a function of AD voltage - it depends on the number of PN sections on the currents way to ground, I guess. But I didn't manage to see how you can predict the voltage range of +3.4V / -2.7V at AD point. The preceding transistor is hanging between -75 and +12 volts...

That said, I did make the current measurements on what I call the "power amp" alone, and it corresponds quite well with your predictions:
- all the resistor in series are approx. 65 Ohms
+ 2V at AD -> 12,7 mA (9,2 mA computed)
+ 3V at AD -> 26,8 mA (24,6 mA computed)
-1,3V at AD -> 10,5 mA
- 2,3V at AD -> 25,3 mA
Its not perfectly symmetrical, but thats seems normal given the design so I decided not to touch anything on this power amp and put the step generator back. Thats not an easy task, with all the dangling wires around and one must take care not to mix up the connectors. Thats where I am right now, fingers crossed, I will make more measurements on the step generator amp itself as you suggested.

I intend to post some pictures of the 576 with the step generator card removed. Haven't found any on the web so far. Looks a bit messy compared to the rest of the unit.

so far, cheers
Martin


Re: Spectrum analyzer Tektronix 7L13 on mainframe Tektronix 7603

Ed Breya
 

Yesterday I looked at the pictures Miguel posted, of the module innards, and I looked at the manuals for the TR501,502,and 503. They all have nearly identical circuits for operating the LO/RF module. I'm at the farm now, so don't have the info at hand, but what I recall is that this module has the same base part number, and a different dash number for each model. The other RF modules and pieces seem to be the same in all models. So, the LO/RF module is really the only difference.

Looking at the LO physical circuit in the picture, it looks very close to the schematic shown in the manuals, except that the output to the coupler appears to be at one end of the meander line resonator, not tapped near the middle. I looked at Miguel's photo album today, and see there's a lot more nice and detailed pictures - nice photography work Miguel.

These circuits are mostly strip-line on alumina substrates, and in what I'd call the danger zone for modification. They are big enough and visible with reasonable magnification, making it very tempting to alter with fine hand tools. It's dangerous because the bond wires and parts are very delicate, so a slip up can easily ruin it. The alumina substrates are nearly impossible to safely solder to in place, limiting the types of possible modification. The other kinds of microwave circuits like PTFE type boards with soldered on parts, and the nearly microscopic scale sapphire ones, I don't consider dangerous - the bigger, board-based stuff is pretty easy to deal with, while the extremely small stuff can't readily be worked on, so I can't and don't mess with those, so they're safe from destruction by me. If you have the right tools like wire bonding machines and such, it's a different story.

Anyway, here's what I've been thinking. First, the three different LO/RF module/model types are nearly identical except for the nominal LO being 2072 MHz for the TR503, while the other two are 2095 MHz. That's about a one percent difference. Second, it could be that the the different dash numbers of the base part are almost all the same internally, with exception of the oscillator section only, being one of two different hybrid assemblies. OR, it could be that the oscillator hybrids are actually all the same, and differ only in some slight way that can be modified during assembly into the different dash versions. This would make sense, to not have to make two different complete hybrids that are so close in function, like a one percent difference in frequency. One way to do this would be to set the proper frequency during final build, by adding (like a solder gob or extra bond wires) or removing (like cutting a trim stub) something that's relatively easy to do. Since only two frequencies are involved (unless this module was used in other products too), one frequency could be "stock," and the other a simple mod. This also presume though, that these were all developed in the same time frame, with all the required application info figured out already.

It is quite common to see all sorts of extra floating or detachable stubs and such in planar microwave circuits, and evidence of "fine tuning" with cuts (even laser trimming), silver dag, solder, bond wires, added foil strips etc. So, one thing I'd look for is to see if there is any evidence of trimming on the meander line resonator - either added or subtracted. The resonator changes from meandering to straight, just past the transistor hookup. Unfortunately, the open end (the only "easy" place to tweak) is hidden under a feed-through post. What I'm thinking is that if it's possible to look closely from different angles in that area, it may show some trim features right at the end. For instance, let's say that the "stock" version is 2072 MHz. There would then be a feature where a tiny stub at the end could be cut loose, shortening the line by a certain amount, to run at 2095 MHz. If it were the other way around, then there would be an additive feature to lengthen it and go from 2095 to 2072, like a bunch of bond wires, solder, or Ag dag jumping the line end to a floating stub. Again, this is all based on my "one oscillator hybrid type" hypothesis, which could be entirely wrong, but I think it's worth a close look at that end, if possible.

So Miguel, I assume you have the actual module shown in the pictures. Is it possible to take a very close look at that line end, and report on it?

I have some other ideas that I'll put up tomorrow.

Ed


Re: 2232 2221A eprom images or current Gtek , DataIO software.

Bruce Lane
 

The site ko4bb.com maintains an extensive library of EPROM image files,
among other things. I would strongly suggest looking to see what's
there, and contributing things they don't have.

Thanks!

On 01-Feb-21 11:48, Bert Haskins wrote:
The

"Re: [TekScopes] NEW TOPIC: Outstanding Rockland Instruments 7000
Plugin; WAS: Slightly OT- Wavetek 7530B?"

post got me thinking about  "rom rot" and wondering if anyone has
archived the eprom images of the 2232, 2221A Tek scopes.

If the answer is no, maybe I should make a project out of doing a
resurrection on one or more of my old eprom programmers and doing the deed.

I have a Gtek 7128 and a Data I/O 201 and a few computers that will do
RS-232.

I also have a pretty good inventory of eproms.

If anyone else is interested in this, just rattle my cage.

  Bert





--
---
Bruce Lane, ARS KC7GR
http://www.bluefeathertech.com
kyrrin (at) bluefeathertech dot com
"Quando Omni Flunkus Moritati" (Red Green)

9321 - 9340 of 187053