Відео

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.

Can you do it with a Photosmart printer

51 anda half seconds of pure internet goodness

✌

is master Ken a fellow gin drinker?

Always interesting!

3:00 Nice!

Very interesting! Did you figure out what the unused tube socket was for? I may have missed that part.

Very very fine job! One suggestion; the plastic lamp mount will not survive the heat. I would exchange it for a ceramic one used for halogen lighting. Thank you all. Best! Job

Some gin was taken and placed inside a random sample of engineers.

Great; OK where do I send my (ahem) specimens for analysis?

Finally! A CuriousMarc video I can understand. I use UV/Vis spectroscopy in the laboratory.

Where was this product built? Was it in Poughkeepsie, New York or Rochester, Minnesota?

Wait.. did you just make your own spongebob meme card? Voice and everything? Thats amazing!

How did they make the color filter slider? As i think the need monochromatic light. So, a dye based filter would not work. Is it made by a grid somehow?

Sounds like the motor ball bearings are pitted. Renewing them should make the instrument quieter.

The Lowry protein assay is reportedly the most cited paper in science.

Wow! Marc upgraded his gear to 4K. :D So cool, thanks for giving us even more visual fidelity.

You know it's going to be a good day when CuriousMarc pronounces something a basket case, but then you check and see you're only 1/3 of the way into the video…

I was unfamiliar with "cuvette" vials, but a quick internet search (and initial misspelling as "couvette") set me straight. Another exciting repair. Now just needs a deep clean! Did you end up replacing that resistor with a higher-wattage version? And I wonder why they labelled the transformer "bad" when it turned out fine.

5:25 I have a 1936 RCA console radio (9K1) with several shortwave bands that changes the dial calibration for each band similar to this. Called the "Magic Dial" of course!

Measuring absorbances is still going strong in the life sciences! Machine was probably made for bacteria cultures as OD values go to 4.

Is there a practical reason why it is red?

It might be hrlpful to google the Spectronic 20 service manual. Also, i noticed that there is no cover over cell where the cuvete goes. Id pyt sonething over that at least

It looks a lot like the classic Spectronic units. I have one from the 80s that is quite similar to that one. They are amazingly sensitive and can be used for a wide range of analysis. They can not only be used for simple absorbance or trans instance tests but if you have an analog output, or tap off the detector you can use a strip chart recorder or digital acquisition system to analyze a rate that a reaction is proceeding which allows you to sort out things. A lot of clinical analysis used to use them before they changed over to specialized instruments using immunoassays.

Gotta love that "bad" transformer. Nice "save". I thought you might put a sample of beer in for a test.😀

Another amazing repair video! Thank you everyone!

I remember seeing my dad use this instrument in the hospital lab in the 70s when I used to accompany him mostly when he was on call. I found the big dial on the eskalab fascinating.

"Can we save it?" I haven't watched the video yet. At 51 minutes, I'm saving it for later. But I have faith in you, Marc. EDIT: Ha! I knew you could do it!

Beetroot juice and cabbage juice are also good pH indicators. No need to waste good gin for that😁

One of the things I love about your channel is getting to see the clever engineering that people did before microcontrollers came on the scene.

Thanks!

user guide available on EBAY !

Congrats on the repair and cal. Perhaps, part 2, where practical analyses are performed for qualitative, quantitative or verifiable results. More on actual applications please. Great video !

It's just a fancy Gin-o-meter. Love it! Great presentation, guys. Amazing knowledge on display.

For spectrometers there are special Halogen bulbs with no UV protection.

Epic

The Arduino transformation from 8 to 5 bits reminds me of "The Shepherd" by Frederick Forsyth where a modern turbine jet has to fly in sync with a propeller-driven plane from 2nd world war in order to survive. The jet almost stalls while the plane goes full-speed.

That was far more interesting than I expected!

Did anyone else cringe when Marc attacked the pots with pliers? I was expecting him to drop them into the live electrics and rotating gubbins. Ah the relief when he went for the socket set....YIKES!!!

Thanks for opening it up and showing us all of the interesting "thingys". ❤

Excellent look at a very unique instrument. You and your team are so awesome! Your videos are my always a must watch.

Awesome...cheers.