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Fortunately (or unfortunately for you) PMTs don't fail very often. They use different physics than typical vacuum tubes. They don't have a hot filament - instead of using thermionic emission to free electrons, the incoming light uses the photoelectric effect to get the electrons flying. So there's nothing to really wear out or burn out, and they only really fail if exposed to too much light while powered on, or if mishandled. Otherwise they last a good long while - we have equipment from the 70s that is still in working order. So the very few failed tubes we have have been chopped up to create demonstration pieces for students to be able to see what the inside looks like, or as test targets for x-ray lab activities. There's a lot of cool structure inside them so it's a good use. In radiation detection they're used for scintillation detectors. These detectors have some sort of medium that emits visible light when irradiated - usually an inorganic crystal doped with certain materials, or special plastics, or an organic scintillator chemical mixed in with a liquid sample, but there are many others including certain gases. The light emitted by radiation interactions with these materials is proportional to the energy of the particle but very tiny, so sensitive light detectors are needed. PMTs are most often used for this because of how highly sensitive they are, and how big of a detection area they can have. The ones I just got have a 5 inch diameter sensitive area, which is needed because my detector is fairly large. I'm sure one day advances in photodiode technology will obsolete them, but that may be a ways off.
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Jul 20, 2021 05:39
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*nodding thoughtfully as I write "photomarkiplier tube" on a legal pad*
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Jul 20, 2021 05:42
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Johnny Aztec posted:I kind of want you to send me a box of burnt out Photomultiplier tubes. Maybe the people running this have a few spare ones. quote:Mounted on an inside superstructure are about 13,000 photomultiplier tubes that detect light from Cherenkov radiation.
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Jul 20, 2021 11:22
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Modify some of those with some internal LEDs, some paint, glue some doo-dads on 'em, they are already 80% of the way there to be background props in a low-budget Sci-Fi scene.
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Jul 20, 2021 14:46
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Easymode posting https://www.youtube.com/watch?v=07Z4iL8hy1A
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Jul 31, 2021 11:11
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"Why do you want a Technology Connections? We have a dirty tech 'erbert back 'ome."  https://www.youtube.com/watch?v=-spTvp5-sf0
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Jul 31, 2021 11:19
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I've just discovered https://telehack.com/ for myself and it has a neato usenet archive!
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Aug 1, 2021 14:25
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This is great. (new Cathode Ray Dude) https://www.youtube.com/watch?v=TfRMLS3j7DM
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Aug 1, 2021 18:48
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Adolf Glitter posted:This is great. (new Cathode Ray Dude)
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Aug 1, 2021 21:46
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I just totally love the guy.
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Aug 1, 2021 22:19
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an actual frog posted:That he painted his studio wall windows 95 teal unironically owns I miss the crackhead basement set filled with graffiti.
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Aug 2, 2021 02:55
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Computer viking posted:That's not my first computer, though. My grandfather used to teach at a community college, and saved a computer they were replacing. This lovely lump of 1979 vintage Swedish tech, which I got for Christmas in 1990, when I was in first grade: I have one of these in storage, also have an 806 (one of the later models), got them off my grandpa that used to work with these computers, I also have a lot of documentation as well as abc-klubben disks for it, none of them start any more, but if I ever dig them out from my storage space I'll share some pictures in this thread. Edit: Oh yeah, I have these up here in my apartment, one of them is an expansion box for the ABC computer line and the other one is disk-drives for the machines.  Ignore the dirt, it's from the fluffy thing you're supposed to put in front of the expansion box, it's pretty brittle nowadays. Kamrat has a new favorite as of 13:31 on Aug 2, 2021 |
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Aug 2, 2021 13:25
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Oh wow, I remember seeing pictures of that expansion box - and the disk OS, I just had the tape drive. The 806 looks neat, though not quite as peak 80s as the cute little 802. 
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Aug 2, 2021 17:08
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https://i.imgur.com/cW8JorQ.mp4
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Aug 3, 2021 17:42
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Was that Jason Alexander?
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Aug 3, 2021 17:49
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GEORGE!
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Aug 3, 2021 17:50
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LifeSunDeath posted:GEORGE! https://i.imgur.com/OIDpId0.mp4
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Aug 3, 2021 18:27
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 E: beaten pretty badly
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Aug 3, 2021 21:51
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My parents had a pink one like this. It was every bit as fiddly as you would expect. It came with us on road trips and I enjoyed trying to tune in local TV stations as we traveled.  The CRT in these things looks wild https://www.experimental-engineering.co.uk/2016/08/22/sony-watchman-fd-20-flat-crt-tv-teardown/
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Aug 3, 2021 22:43
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Alot of noise here but this is pretty drat cool: https://imgur.com/gallery/gUosOKS 
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Aug 6, 2021 19:17
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Here's the tweet, I absolutely hate links to imgur pages. https://twitter.com/Foone/status/1423369057181454339
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Aug 6, 2021 20:20
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GreenNight posted:Alot of noise here but this is pretty drat cool: that's so mean
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Aug 6, 2021 20:20
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Mescal posted:that's so mean imagine rationing out your porn tape...
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Aug 6, 2021 20:41
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Flipperwaldt posted:Here's the tweet, I absolutely hate links to imgur pages. Anyone know where to find the documentary referenced in the thread? https://www.imdb.com/title/tt2883206/ I've only found the trailer: https://vimeo.com/107292358
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Aug 6, 2021 21:18
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Guy Axlerod posted:Anyone know where to find the documentary referenced in the thread? https://www.imdb.com/title/tt2883206/ I am incredibly interested in that doco. If you find it in any way - let us know!
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Aug 7, 2021 04:49
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Does anybody know that this is?
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Aug 7, 2021 20:51
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That's a pedometer for a DS fitness game. EDIT: https://www.engadget.com/2008-03-10-ubisoft-reveals-ds-pedometer-for-my-weight-loss-coach.html
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Aug 7, 2021 21:18
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Thank you very much.
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Aug 7, 2021 21:35
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My phat DS still works. I don't know where the charger is, and it's probably been 5 years since the last charge. They are immortal.
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Aug 7, 2021 22:20
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https://www.youtube.com/watch?v=sHCbR9NYmig
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Aug 8, 2021 11:20
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Nocheez posted:My phat DS still works. I don't know where the charger is, and it's probably been 5 years since the last charge. This summer I found my wife's 3DS lying in a drawer, unused since 2014 or so. I turned it on and the battery was still at 40% or so. I went and bought a charger cable and the drat thing still functions almost as good as new. Nintendo handhelds have a rep for longevity for a reason, nothing obsolete or failed there.
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Aug 8, 2021 12:07
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Nocheez posted:My phat DS still works. I don't know where the charger is, and it's probably been 5 years since the last charge. Same, in my case it's my DS Lite. Not touched for a LONG time and still had charge. A;so a fun fact is that a MiniUSB WILL work to charge them.
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Aug 8, 2021 12:20
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My original GBA is still going strong. I bet if I dug up my very original Gameboy from my parents' basement and tossed some batteries in it, it would be just fine, too.
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Aug 8, 2021 15:41
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Nerds. Nerds never change.
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Aug 26, 2021 23:41
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The rounded face fixed the squarest thing: https://www.youtube.com/watch?v=ROpEaDVwx6w
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Aug 27, 2021 14:46
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"It only took us one minute to change the drive... should we go back and make the intro longer?" "Nah, just boot it up and click around for a while."
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Aug 27, 2021 16:10
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I used to use one of those as a foot stool in college. Sold it for $350 I think. Got it from, no joke, a auto scrap yard.
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Aug 27, 2021 16:10
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It's funny how things go from 'so common you literally can't give them away' to 'valuable antique' seemingly overnight. Like finding out that in the future AOL promo CDs are used as currency.
Imagined has a new favorite as of 19:38 on Aug 27, 2021 |
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Aug 27, 2021 16:18
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I briefly worked at the college computer store and they were selling the NeXT. The monitor was so sharp... used Display PostScript. At the time they were also selling the Macintosh Portable, The Macintosh II and the HP LaserJet III so there was alot of cool new technology to play with.
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Aug 27, 2021 16:48
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Back in college I could have bought a working NeXTstation from a computer recycler for about $200. I kick myself occasionally for not doing that, but I was a broke student.
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Aug 27, 2021 16:51
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