Re: 7000 test/cal module(s) and backplane breakout board.
Thanks for the reminder. Yes, I did manually chamfer the edges before inserting the board, but the reminder is good for anyone contemplating similar experiments. I am unsure how to request chamfered edges from OSHpark (who I use for my prototypes), that is on my list of things to research before the next board order. On Tue, Jul 27, 2021 at 11:12 AM Chris Wilkson via groups.io <cwilkson= [email protected]> wrote: Real quick...
Before you plug that into a scope, make sure your PCB edge is chamfered!
Don't plug a raw cut PCB into the scope or you have a good chance of
damaging the female connector on the backplane.
Maybe the fab already did that for you, or you did it at home with a
file. It's hard to tell from the photos.
-- Andy
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Re: 7000 test/cal module(s) and backplane breakout board.
Real quick...
Before you plug that into a scope, make sure your PCB edge is chamfered!
Don't plug a raw cut PCB into the scope or you have a good chance of damaging the female connector on the backplane.
Maybe the fab already did that for you, or you did it at home with a file. It's hard to tell from the photos.
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Re: Tek Scopes found in old picture book
I have that book! Very much an oversized coffee table type book. It's a fun one.
Intel gifted it to us when it was first published. Back when large employers still valued their employees happiness, blah, blah, blah...
IIRC, Intel worked with the author directly to make the book happen? Memory is fuzzy.
I think everything in the book took place within the space of 24 hours, somewhere on the globe. So it very much is a time capsule from that day.
I count at least 6 scopes in that picture.
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Always willing to help. Sell and even loan out extenders I have on hand. Prototype something special you might need.
John "Sparky" Nery
3 Springer Ave.
Tiverton, RI 02878
WA1ESO@... WA1ESO(AT)JUNO(DOT)COM
401-624-4576
Phone call between 8A and 8P East Coast time only please
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Re: Tek Scopes found in old picture book
The book was a collection of photos taken on 11 July 1997 -all round the world. More info here-
I think that's a std 13 amp UK type plug and plug board on the ground - the racks are on a computer floor but not tied down-they are on an angle that is not lined up with the floor tiles and have horizontal steadying bars on the bottom. Looks like whatever it is was shifted there from elsewhere.
DaveB, NZ
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-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of Dave Peterson via groups.io Sent: Tuesday, July 27, 2021 17:56 To: [email protected]Subject: [TekScopes] Tek Scopes found in old picture book Hi All, Thought folks might be entertained by this picture I found. Currently helping my wife with downsizing her mothers household. Came across this book: And inside found: /g/TekScopes/photo/266495/3272287?p=Name,,,20,0,0,0 How many Tek Scopes can you find? Any guesses what they're working on? And any chance anyone knows who is in the picture? There wasn't any specific information on the picture in the book. The subject was more general computers in technology. The book is currently on a slow boat back home, so I might be able to do more research once I'm able to dig it back out. Dave
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Check that all socketed transistors are well seated. My 503 had a dropout
that was corrected by pushing a transistor back into the socket. If I
recall, the component in question was near the front of the instrument.
Dave Casey
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On Mon, Jul 26, 2021, 8:18 AM romeo987 <romeo987@...> wrote: Jeff, Zen,
Thanks for your replies.
Theres no real issue with the things being ¡°within spec¡±. Tek stuff does
that! I recently repaired the display on a 1502A that had been sitting at
work for 5 years U/S and then 10 more years in my shed before I ¡°got round
to it¡±. Once it was working, I started to perform the performance tests.
First test was - check the 12V supply. Measured 11.998 (with a DVM at least
that good). After three or four more steps like that, I lost interest in
doing the rest.
But I digress¡
The question I am pursuing is not ¡°are your units in spec?¡±, but ¡°do your
units cut out at the extreme low (as in - physical knob rotation) ends of
the 5 and 10MHz ranges?¡±.
I have three units. I don¡¯t know what numbers correspond to ¡°late¡±, but
two of my units (B051¡ and B067¡) do cut out, whereas B066¡ keeps happily
going all the way.
In each case, we¡¯ll below the ¡°specified¡± LF limit, but I am simply
curious (anal?) :-)
Roman
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Re: Tek Scopes found in old picture book
I think the modules in the racks look a bit too complex to be digital modules. Perhaps its not a digital computer but an analogue one?
cheers
Martin
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Re: Tek Scopes found in old picture book
On Tue, Jul 27, 2021 at 7:55 AM Dave Peterson via groups.io <davidpinsf@...> wrote: Thought folks might be entertained by this picture I found. Currently helping my wife with downsizing her mothers household. Came across this book:
And inside found:
/g/TekScopes/photo/266495/3272287?p=Name,,,20,0,0,0
How many Tek Scopes can you find? Any guesses what they're working on? And any chance anyone knows who is in the picture? Interesting picture. It looks like they're working on a valve/tube-based computer of some sort, and there's an odd mixture of technology in use. What look like mid-1980s PCs with 500 series scopes as well as a 453 (or 454) and various 465s or similar. I'd guess it's a restoration project of some sort but I can't identify the computer. Chris
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Re: Tek Scopes found in old picture book
From Tim P (UK) Early computers, such as Colossus, EDVAC, EDSAC, Whirlwind etc. were built on open relay racks. I wonder if the photo shows a reconstruction, or 'working model' of an early machine. Any guesses on the date from the 'scopes and PCs in use ? Tim On Tue, 27 Jul 2021 at 07:12, cheater cheater <cheater00social@...> wrote: Great find. Few pictures of these actually performing their job in a
real environment.
On Tue, Jul 27, 2021 at 7:55 AM Dave Peterson via groups.io
<davidpinsf@...> wrote:
Hi All,
Thought folks might be entertained by this picture I found. Currently
helping my wife with downsizing her mothers household. Came across this
book:
And inside found:
/g/TekScopes/photo/266495/3272287?p=Name,,,20,0,0,0
How many Tek Scopes can you find? Any guesses what they're working on?
And any chance anyone knows who is in the picture?
There wasn't any specific information on the picture in the book. The
subject was more general computers in technology. The book is currently on
a slow boat back home, so I might be able to do more research once I'm able
to dig it back out.
Dave
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Re: Tek Scopes found in old picture book
Great find. Few pictures of these actually performing their job in a real environment. On Tue, Jul 27, 2021 at 7:55 AM Dave Peterson via groups.io <davidpinsf@...> wrote:
Hi All,
Thought folks might be entertained by this picture I found. Currently helping my wife with downsizing her mothers household. Came across this book:
And inside found:
/g/TekScopes/photo/266495/3272287?p=Name,,,20,0,0,0
How many Tek Scopes can you find? Any guesses what they're working on? And any chance anyone knows who is in the picture?
There wasn't any specific information on the picture in the book. The subject was more general computers in technology. The book is currently on a slow boat back home, so I might be able to do more research once I'm able to dig it back out.
Dave
|
Tek Scopes found in old picture book
Hi All, Thought folks might be entertained by this picture I found. Currently helping my wife with downsizing her mothers household. Came across this book: And inside found: /g/TekScopes/photo/266495/3272287?p=Name,,,20,0,0,0 How many Tek Scopes can you find? Any guesses what they're working on? And any chance anyone knows who is in the picture? There wasn't any specific information on the picture in the book. The subject was more general computers in technology. The book is currently on a slow boat back home, so I might be able to do more research once I'm able to dig it back out. Dave
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Re: 5642 rectifier tubes in a Tek 535: Replace or swap for silicone?
Dom,
The filament windings can be left on or taken off. Check the high voltage when they are replaced. Clean the high voltage area to remove dust, dirt, etc. to eliminate leakage paths, if you have not already cleaned it.
The diodes I mentioned are not the only ones that can be used. If you are in the US and want them faster, use 2CL2 in the search. That will show the series that is currently for sale. There are ones in the states that have a higher voltage and a higher price than the H version. Corroded through wires on 5642s I have seen and replaced them with Si types. The Si replacements will have a lower voltage drop than the 5642s. That may alter the high voltage enough to adjust it. The higher current Si types have lower drop than the low current types of the same voltage. At these voltages, the drop is not a problem, more of information. The prices of these are good. They should not have to be replaced again. A one-time investment. Any spares you will likely use.
I hope you get your scopes working right. I have a fully restored 535A I like to use at times.
Mark
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Re: 7000 test/cal module(s) and backplane breakout board.
Eric,
if I understand correctly, the board you are making for the 7854
isn't a replacement for the 067-0587-xx boards, but something to do with
the digital capabilities of the 7854, is that correct ?
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On Mon, Jul 26, 2021 at 10:46 PM Eric <ericsp@...> wrote: Andy, if you need lots of pictures of the cal fixtures let me know I have a
-01 and -02 here in the lab. I am also in process for a test board for a
7854. I had a unit arrive today.... destroyed by the shipper and bad
packing. It will at least give me something to test on. I'll be in to board
layout shortly.
On Mon, Jul 26, 2021, 10:35 PM Andy Warner <andyw@...> wrote:
I have a 7904A, that I intend to keep in good working order.
However, I've not seen many cal fixtures on the market and reckon the
prices are only going to go in one direction for the near future. I am
planning to design one or more cal fixture(s) using modern components. I
figure I'll learn a lot more about the scope in the process, have some fun,
share the designs, and hopefully others can find the work useful.
Step 1 in this process is a simple passive breakout board for the backplane
connections, to allow me to experiment and prototype things. I checked the
archives and did not see an existing design, so I cooked one up. The
v1 boards are just back from fab and I have uploaded some photos here:
/g/TekScopes/album?id=266487 I am in the process of
mounting the board in a parted-out 7A26 module frame that I had on-hand,
will update more photos as I continue (assuming there is interest.)
This board brings out the high speed signals to BNCs and the low speed
signals to screw connectors. The low speed signals are grouped roughly by
function (power, readout, IEEE-488, misc.) Be aware that for this version,
I did not match the high speed signal path lengths, or worry too much about
impedance.
I'll probably create a project page somewhere with the eagle files, the
BOM, and progress as I work on cal/test fixtures, if anyone wants to follow
along. Look for an update when I get organized enough to do that.
--
Andy
--
Andy
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Re: 7000 test/cal module(s) and backplane breakout board.
Andy, if you need lots of pictures of the cal fixtures let me know I have a
-01 and -02 here in the lab. I am also in process for a test board for a
7854. I had a unit arrive today.... destroyed by the shipper and bad
packing. It will at least give me something to test on. I'll be in to board
layout shortly.
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On Mon, Jul 26, 2021, 10:35 PM Andy Warner <andyw@...> wrote: I have a 7904A, that I intend to keep in good working order.
However, I've not seen many cal fixtures on the market and reckon the
prices are only going to go in one direction for the near future. I am
planning to design one or more cal fixture(s) using modern components. I
figure I'll learn a lot more about the scope in the process, have some fun,
share the designs, and hopefully others can find the work useful.
Step 1 in this process is a simple passive breakout board for the backplane
connections, to allow me to experiment and prototype things. I checked the
archives and did not see an existing design, so I cooked one up. The
v1 boards are just back from fab and I have uploaded some photos here:
/g/TekScopes/album?id=266487 I am in the process of
mounting the board in a parted-out 7A26 module frame that I had on-hand,
will update more photos as I continue (assuming there is interest.)
This board brings out the high speed signals to BNCs and the low speed
signals to screw connectors. The low speed signals are grouped roughly by
function (power, readout, IEEE-488, misc.) Be aware that for this version,
I did not match the high speed signal path lengths, or worry too much about
impedance.
I'll probably create a project page somewhere with the eagle files, the
BOM, and progress as I work on cal/test fixtures, if anyone wants to follow
along. Look for an update when I get organized enough to do that.
--
Andy
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Glad it was something so simple and cheap to fix -- just a 555 instead of some left-handed unobtainium hydroxide.
-- Cheers,
Tom
--
Prof. Thomas H. Lee
Allen Ctr., Rm. 205
350 Jane Stanford Way
Stanford University
Stanford, CA 94305-4070
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On 7/26/2021 19:36, Richard Peterson wrote: Quick update to close the loop. I went through the components related to the NE555 timer and concluded that it was, indeed, a dead IC. I injected a 20.48 kHz signal at the output of the NE555 and the display came to life. I replaced the IC and its working great. Calibration was pretty much spot on as far as i can tell with my limited testing. Thanks again for all the feedback. Another TM504 lives along with the PS503A, FG502 and of course the DM502 that came with it. The fourth slot has a storage box that had an unused temperature probe & manual and a variety of test leads, banana jumpers and some odd push-in BNC jumpers with molded plastic ends that fit into a female BNC and will accept a male BNC on the back side of the plug. Looks great along side the TM503 . . .
Rich
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Re: 5642 rectifier tubes in a Tek 535: Replace or swap for silicone?
HI Mark,
Thanks for your advice. I can see the one's you're talking about on fleabay- they're certainly a good price. I'll be replacing all five because I'd imagine the corrosion that ate through the legs of the others is probably affecting all of them.
Forgive my ignorance but I'd imagine that removing the 5642 heater loops from the HV transfomer won't have any significant affect on the output of the HV section? I guess it'll need to be recalibrated but can I just install the diodes and remove the heater loops without any further modification?
Thanks again for your advice,
Cheers Dom.
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Re: 5642 rectifier tubes in a Tek 535: Replace or swap for silicone?
Hi Mike,
That's terrific- certainly a lot cheaper than the diodes from Digikey. I hadn't seen that site before and it looks like they have some great stuff! I'll have a browse now and I'll let you know how I go.
Thanks again for your advice- I really appreciate it.
Kind regards,
Dom.
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Quick update to close the loop. I went through the components related to the NE555 timer and concluded that it was, indeed, a dead IC. I injected a 20.48 kHz signal at the output of the NE555 and the display came to life. I replaced the IC and its working great. Calibration was pretty much spot on as far as i can tell with my limited testing. Thanks again for all the feedback. Another TM504 lives along with the PS503A, FG502 and of course the DM502 that came with it. The fourth slot has a storage box that had an unused temperature probe & manual and a variety of test leads, banana jumpers and some odd push-in BNC jumpers with molded plastic ends that fit into a female BNC and will accept a male BNC on the back side of the plug. Looks great along side the TM503 . . .
Rich
|
7000 test/cal module(s) and backplane breakout board.
I have a 7904A, that I intend to keep in good working order. However, I've not seen many cal fixtures on the market and reckon the prices are only going to go in one direction for the near future. I am planning to design one or more cal fixture(s) using modern components. I figure I'll learn a lot more about the scope in the process, have some fun, share the designs, and hopefully others can find the work useful. Step 1 in this process is a simple passive breakout board for the backplane connections, to allow me to experiment and prototype things. I checked the archives and did not see an existing design, so I cooked one up. The v1 boards are just back from fab and I have uploaded some photos here: /g/TekScopes/album?id=266487 I am in the process of mounting the board in a parted-out 7A26 module frame that I had on-hand, will update more photos as I continue (assuming there is interest.) This board brings out the high speed signals to BNCs and the low speed signals to screw connectors. The low speed signals are grouped roughly by function (power, readout, IEEE-488, misc.) Be aware that for this version, I did not match the high speed signal path lengths, or worry too much about impedance. I'll probably create a project page somewhere with the eagle files, the BOM, and progress as I work on cal/test fixtures, if anyone wants to follow along. Look for an update when I get organized enough to do that. -- Andy
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Re: Paper Used in Older Tek Manuals
Greetings,
Just FYI, both of my Ibico punches are combination machines.
One has an electric driven punch the other is manual. Both have a section on the top of the unit used to install or remove the comb.
Enter a search for "Ibico comb binding machine" and you should get an assortment of images.
I like this style of binding documents.
Take care,
Ken
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On 26Jul, 2021, at 6:22 PM, Michael W. Lynch via groups.io <mlynch003@...> wrote:
Get the comb binding punch and the installer as well. Two pieces are necessary.
--
Michael Lynch
Dardanelle, AR
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Martin
Dave Peterson
Dominic O'Kelly
Richard Peterson