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Riddim

Hard to believe this entire field was made obsolete almost overnight by LCD.

Isn't it nice when all the semi's are socketed, well unless the sockets are corroded.

You see how the vacuum in the crt just sucks the glass in when the tube breaks

Great oscilloscopes! I restored a 545A.

The old style wet tantalum capacitors usually have a sulphuric acid electrolyte, make sure to neutralise any leakage with a water and baking soda paste.

Great stuff here!

I think it is about the volume of manufacture. There is still something like this happening and I am glad being part of it. I am talking of dilution cryostats. Welding, brazing, sintering, electroplating. Done in-house in small batches. There must be other products too, but only small scale. The pressure gauges we use say "made in Lichtenstein" 😅

I fixed a couple of PS501's and found one had an open circuit main filter cap and the other had a dead (open) current limit LED. As the LED itself is part of the feedback path, this caused it to have no current limit at all and I ended up killing the pass transistor in the mainframe.(replaced the LED's with brighter 1980's ones) I also have problems with intermittent operation of the output PBT switches on both units & with similar switches on the DM501's I have.

Concise analysis of the failure, its potential causes, and possible remediations. Very well done.

Is there a suitable (modern) replacement for the 741 that has a higher maximum supply voltage? OPA551 maybe? It strikes me that the choice of OpAmps may have been more limited back when these modules were designed and the 741 was chosen. I sometimes wonder if the choosing of the 741 is willful or just "that'll do".

Great info! Tnx for your efforts!!

We had two of these at U of P when I was there.

I don't know about Bldg 13, but I do know Bldg 50 had significant asbestos issues even into the 90s. If work above the drop ceiling was happening, everyone had to go home. That would explain the mask precautions.

I worked on such a machine as an intern in 1979. The system was complemented by a file manager (8 inch floppy drive) and a plotter, all connected via GPIB. The performance and of course the graphics capabilities were amazing. I still have some listings and plots from these days.

Can you play 'Artillery' on it?... KABLOOIE!

Fantastisc, Very satisfying to watch

Wow! I think the 611 was the series of storage tubes used in the 4051 and 4052! I loved my 4051 in my first job after university - it was my first personal computer experience! When I tried to find one in 2000 - I found a 4052, then found a 19-inch 4054. I love both of them and am still creating new BASIC programs for them!

You might be interested in this RUclips video. It is part 1 of a very detailed restoration of a 576 curve tracer. ruclips.net/video/pQRmlUGJsZA/видео.html

Hi Bob, Just finished looking at the video of the 5-volt supply. My 468 had failed about a month ago and I finally got around to check it out the other day. The problem was exactly the same. The Shotkey diode was shorted. Luckily the crowbar transistor was still okay. I replaced the diode and the capacitor next to the diode because it was leaky. Now the 468 is up and running again. Good video on replacing the diode and troubleshooting the problem. Don

Awesome film, it made me want to recreate the campus in both cities Skyline, and minecraft so that it will never be lost to time

I have a problem with the 4x attenuator on one channel. Not sure if it is the attenuator or the board at that location. I should swap the 4x on each channel and see if the problem moves. Then I will know if it is the board or the attenuator.

lovely vintage porn .............. could watch this all day ........none of us could afford these back in the day, but i did repair a 7603 with 7b53a . and 27a18

👌👍

Suggestion for cap alignment??? Maybe make a jig from a piece of very thin cardboard... Place the thin board on top of the freed PCB and mark the pin hole placements. Cut slots (a single cut with the scissors, with no extra width) from the side of the board inward to reach the pin holes. Slide the jig onto the cap pins. Drop the PCB onto the cap pins. Solder in place. Remove the jig, by sliding it off of the cap pins. I hope that was clear and that it helps someone..

If those caps are not specially selected why not make the job much easier by just replacing them, rather than dealing with the short leads?

I might have thrown a little bit of RTV748 electrical grade silicone to hold the capacitor in place. Those leads are a bit long and vibration could be an issue.

Have to agree that when assembled those cap leads were full length and easy to "thread" into the board and then trimmed once soldered. Good tip about 2x the farard value for replacing tantalum with electrolytic.

It would be nice to also mention that the power supply diodes and filter caps are a bit undersized and they tend to fail pretty often. Also isn't one of the capacitors charged with making a thru-hole connection and must be soldered on both sides? Also its ground lugs are tasked with carrying ground currents between the ground lugs. Kinda iffy, fellas.

I l❤ve crt 😍

Wish someone could remaster these (or whatever its called) videos into 4k. I remember watching high school films like this growing up in the 70s

grade A top shelf retrotek FROM long ago like God intended

I have to believe this transition to digital storage was a game changer in diagnostic and testing. I also miss the voices of the narrators of old videos!

This is a great idea. I am going to build a jig and use this with my 577. The wide voltage and current range on the 577 means that I can test most capacitors I will ever encounter. Thanks!

Freight Train!

Next, tie a cable to the transistors emitter and base leads, and then hook it to your trucks trailer hitch. Once completed, hit the gas pedal.

Thanks

Cool video! I’m fascinated by Tektronicx and recently purchased a TM 503, a TM504 and several modules. Mostly DM’s and PS’s for now. Will complete the TM series cabinets with a TM501 and TM506 and then add as many modules as I can find for a reasonable price. I want an analog Tektronicx oscilloscope and will probably go with a 2200 series unit. I’ll want to get a couple similar enough to use for parts enough to keep one unit functional.

The spiral resistance shown being deposited inside the large part of the glass envelope, was known as a GPA, or Gradient Potential Anode. It was connected to the final anode at the phosphor end, and the other end connected to next anode at the thinner end; which was connected via a well spaced pin on the tube base pins, so as to form a voltage gradient between them, giving a steady increasing voltage between the last two anodes, to give a gradual increase of accelerating voltage to the electrons towards the phosphor screen, to improve focus and acceleration of the electron beam while traveling in the wide part of the tube.

So is the plan to get an e tracer and purchase hundreds of tubes to find one sufficiently matched

Amazing to have this pop up. Nothing I've been looking at is anywhere close to suggesting this. I used to work in the building that fired these. There were two very long kilns and I placed the greenware on the moving belt and removed the fired product. There were additional duties as well and this was in the later 60's. I still have one rectangular crt.

Wow! This brings back memories. I worked as a summer hire in 1980 & 1982 'flashing' 611 tubes on a RF machine and soldering on the connector pins to the ceramic body. After I was done, they would go to QA next door and if the passed they were painted (which I also did in 1982). They were also producing a lot of the single line hardcopy CRTs at that time. Also in the same room were the vacum pumps for some of the more narrow tubes and on occasion I would have to drag around a large tank of liquid nitrogen to refill the pumps. It was fun to see some of the liquid nitrogen spill onto the floor and scatter like bb's. Thanks for sharing!

My dad used to do CRT research with phosphors on ground glass plates sealed to a tube with vacuum grease, in the early days of color TV. If I had to guess, I'd say those big round ones were for RADAR systems.

Those large round ones were for radars, often with mechanically rotated screens to match the antenna turns. Later tech made them obsolete(as we all kno)

When I started my first job out of college, I worked for a family electronics business that was founded by a Tek alum. We were awash in Tek scopes and a lot of the practices (vertical business structure, engineering processes, and even the part numbering scheme of XXX-YYYY-ZZ) were carried from Tek. I even had one of the scopes from the era depicted in this movie, and while the switches needed cleaning, it was still in mostly working condition when I gave it away. (I kept a much smaller model from the 80s, a lot more practical for my space constraints.) The more I learn about Tek the more I understand where my former boss got a lot of his habits and ideas from.

Those dies are exceptionally valuable to the continued Operation of Tek scopes. With them, vintage CRT's can be made anew. I for one am over joyed that they still exist!

Helmets and masks... and short pants and TEVAs!

That's incredible. Most technical museum's would be over joyed to have that much space.

I saw a ccfl fixture, how no lights are on?

Tektronix seems like it would have been a cool place to work at.