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I don't remember how many of these I've repaired and/or calibrated over 25 years, but I nearly memorized the schematics and service manual!

I watched this one, thoroughly enjoyed it, and couldn’t help but think about possibly unrelated stories about HP gas chromatographs like the ones I used to use, like the 5890 and its companion the 3396 integrator. Would you be interested in exploring those?

Looks similar to the Rod perenant memory use in nixdorf computers around 1970

I may also get a copy of SOPHIE solely for academic purposes, and 'accidentally' bump the B switch.

"My PC has a paper display" "You mean e-ink, right?" ... "Right?"

why haven't rockets had the same kind of massive technological advancement that computers have made since the 60s?

PIDP-8 or PIDP10?, I can only get one, it's hard so decide on which one!! They both look so nice.

A fun mod to that might be a motor that scans the wavelength and produces a spectral response. Modern devices do that automagically, but the accuracy of this unit might produce a much more authentic response, since the filter is single-wavelength. Many years ago, I worked in a university science shop where they "scanned" materials based on spectral reflectance with a similar device, and somebody there wrote a paper on it - the concept was the same, scan a filter over the range and digitize it in the frequency domain. Anyhow, I really enjoy the chill of your content, it is always a Sunday treat! Cheers!!

the pdp 11 was used to program atari 6502 assembly and 2600 games

which Thinkpad Mike uses?

I'm especially impressed that you are not intimidated by the complexity of this project

Thank You Mark, great video as usual, one question Sir if you please, why the mixer assembly with the Comb gen. assembly rotates while we tune the cavity?

Where are the matruska dolls around the clock shown in the cover

suprised nintendo didnt buy it

to see a electronic graphical display from the days when the micro chip hasnt been invented .its a really amazing standard of computing without a modern cpu that was 1st commercialised in 1971 the 4004 was the 1st COMERCIAL cpu .USAF made the first cpu but that was classified

1024x1024 in 1959 i remember my acorn electron...from 1984 it could display 640x256 choosing 2 colors from a pallate of 8 and it weighs ½kilo at most but the pdp weighed 1600lbs

So, are you suggesting that silicon photomultipliers have surpassed tube ones? I feel like it depends on the application. For example, as far as I know, the SiPMs still can’t achieve a dark current as low as a tube multiplier without being cryogenically cooled. I would be interested to hear other perspectives on this.

These have been used in wind direction systems of wind measuring equipment that are analog for many many years. Mounted inside the weather vane housing, a 5 wire cable would be run down inside to the gauge with a compass. They would run with 6VAC across the rotors. Accurately displaying real time wind direction. Unfortunately these little gizmos are becoming very hard to find, as many have been discontinued manufacturing.

Me, troubleshooting an issue on my HP 8566B, thinking "How the heck did they design this in the 1970's?"... then this little piece of 1960's tech comes along. Wow. Just wow.

Looks like the accounting paper my dad used to bring home.

As a biologist I cheered for this incredible crossover episode! Nicely done!!

Would that not have some way to compress the signal so that it can be sent back to base and leave space for other data.

I see you have the life-size Apollo cockpit poster of the main control panels. I created that for Luna Replicas and all the other cockpit posters they sell. I'm honored that you fellas have that poster.

okay i read through the comments and it looks like I have to be the one, sorry. "Is that thing turbocharged?"

Yet another endlessly fascinating CuriousMarc banger. I clearly remember color banding through different materials in chemistry class a few decades ago. Seeing the process performed mechanically is such a testament to engineers of the time. Nice 4k upgrade, my friend!

How long to the next moon flight? :-)

Brilliant

I've used a more modern version of this to evaluate the effectiveness of filters at removing dyes or pollutants/sediment from wastewater. Really handy little machines.

Neat little device. And one I could almost understand the circuitry for.

Beautiful! I think we had a machine much like this in the back room during college, but never got to use it. And the gain control for the reference sample. I need to remember that.

Empress gin (Victoria Distillers) is pretty tasty, btw. Great way to top off the video.

I think it is even more difficult then what was shown here. I assume there is a book somewhere with tables in it, translating the ciphers on the scale to useable numbers. This instrument must have costed a small fortune and I guess it could only be operated by extremely well trained technicians.

wow

Fantastic reverse engineering!

Great job on a beautiful and very cleverly designed instrument. The party trick for changing the absorbance scale on the meter is something I had never seen before. And the sheer _size_ of that meter!

We live near the GlaxoSmithKline pharmaceutical factory in East Yorkshire, UK, but I never knew they were involved in making lab equipment lol.

Damn. I really want to get taught by all of you ! The methodology and understanding and explaining is amazing !! I hope kids , grandkids really take lessons from you because you are one in a billion ! Thank you for the amazing video :D !! like always

Thanks for another great vedio'

Bravo..! I consider Marc, Master Ken, and all of the tribe of the restoration team to be the professors in my post-graduate self education. Best morning coffee videos to inspire a day...!

Ohhh those dichroic filters are cool, choosing the correct layer number, thickness and refraction index of each layer you can made them notch band, pass band, lower band, high band, wide or narrow band, very narrow band (which is the case here) to any wavelength you want.

A Nyone who was a hospital lab tech in the 70s will be very familiar with thesr machines.

Photomultiplers are still unbeatable in certain applications because semiconductors (even avalanche ones) are too noisy or/and not sensitive enough: for detecting neutrinos photomultipliers with 50cm (20 inch) in size and shape like of an old CRT are used like on Super-Kamiokande in Japan, they were developed by Hamamatsu.

I guess they needed common "core" after all for their rope memory...yeah.

I picked up one like this at the tip back when I was 17 many moons ago. I was too young and stupid to realise what I had this was before the internet had really taken off. Sadly I no longer have it in my possession. Ah the follies of youth😢

I'd love to find 3 of those meters or 3 old vintage meters of similar size to build an angular clock kit with.

you'd likely have a bunch of standards stored in the side slots as well as samples. on a digital one of these you'd setup a calibration curve in software but you can do the same thing using an analogue instrument like this

Those bad capacitors - I could troubleshoot that problem. But the rest depends on other physical things that I would not have any experience with. I realize that Marc and Ken took several days to develop a schematic and diagrams. One has to approach this systematically. And that's probably the most important thing I've learned from watching Curious Marc's channel. Thank you so much.

You guys are fantastic. Thank you!

I imagine back in the day an instrument technician would have spent a lot of time fixing this unit. Great job team.

Well, a spectrophotometer is a nice thing to have, but today you need a gas chromatograph and a nuclear resonance spectrometer, at best a gas chromatograph coupled to a nuclear resonance spectrometer and, if your chemicals are spread spatially, a scanning electron microscope coupled to a soft x-ray spectrometer that can tell you the spatial distribution of the chemical composition of what you are looking at is a must have. In the past, the little chemist's home lab consisted of a bunsen burner, a water suction pump, some glass work and a small chemistry kit only, but now the above mentioned instruments is what you need at least. The times, they are a changing.