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Lines of Light: How Analog Television Works

  • Published on Jun 30, 2017 veröffentlicht
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    Have you ever wondered how old-school television worked? It seems almost impossible for a device to make moving images without a computer being involved. Yet analog television is very, very old. How on Earth did it work? Find out in this video.
    All images used in this video are in the public domain, either due to age or the author's will.
    If you like videos like this, I humbly ask that you hit that like button and subscribe! I'm doing my best to keep videos like this headed your way.
    You can support this channel through Patreon! Find me here:
  • Science & TechnologyScience & Technology

Comments • 2 489

  • The 8-Bit Guy
    The 8-Bit Guy 4 years ago +704

    Very nice work.

    • Aurora
      Aurora Hour ago


    • Tiffany L
      Tiffany L Month ago


      REMEMBER ME TV Month ago

      The 8 bit guy has spoken.

    • salt
      salt 2 months ago +1

      I know this comment is 3 years old but youre awsome dude

    • Jackson G
      Jackson G Year ago

      What?? No tv was not remotely viable till 1920s

  • Matt Mc
    Matt Mc 3 years ago +559

    The clearest and simplest explanation of a CRT I've seen on the net. Thank you

  • Gordon Talge
    Gordon Talge 3 years ago +311

    I remember back in the 1970s there was an over the air subscription tv channel that would broadcast a scrambled signal. The video signal was scrambled by messing up the horizontal sync pulses with a sine wave. The audio was heterodyned out of hearing range. The idea was you rented a decoder box and subscribed to their service. Someone came up with a "kit" to build your own decoder and that was kind of the beginning of the end.

    • KamakaziOzzie
      KamakaziOzzie Month ago +1

      @vaultboy 124 could be the flux capacitor

    • Im CROW
      Im CROW 2 months ago +1

      ah piracy has come a long way since then

    • Big Baller
      Big Baller 2 months ago +1

      @vaultboy 124 You're better off taking it to a specialist. CRTs are extremely complicated and very difficult and dangerous for a layman to fix.

    • Big Baller
      Big Baller 2 months ago +3

      The 70s was interesting because TV didn't have any "security" whatsoever, so anyone with a little know-how could intercept signals for free like you mentioned, or even hijack broadcasts quite easily.

    • vaultboy 124
      vaultboy 124 2 months ago +1

      Can you diagnose a problem with my crt?
      it seems dead ie completely dead
      But pressing the power button causes a high pitched squeal but nothing else
      There is nothing else
      But a feeling of static on the tube
      It's a 14 inch color crt monitor
      From 1992
      And I mostly bought it because it matched my Dell 333d computer
      I kinda want to get it working
      Also while I know the computer also works by actually using a tv active modulator to send the signal to a tiny 6 to 7 inch black and white portable tv that actually does work
      But lacking sound
      And the crt tends to have a double image and a wibble. But the issue is with the crt monitor in question

  • Elsif
    Elsif 2 years ago +255

    Electronics, even the kind that we've "outgrown", never stops being magical to me

    • Paolo Vallejo
      Paolo Vallejo 8 months ago +6

      Specially the ones that we've "outgrown"

    • Nathan
      Nathan Year ago +29

      Everything we have now builds on the stuff that came before. And even "obsolete" stuff is well beyond the average person's understanding when it comes to how it actually works.

  • Shawn
    Shawn 3 months ago +129

    The high pitch whenever the TV was on screen was mind-numbing...thanks for calling this 31-year-old "young"

    • omzig18
      omzig18 Month ago +1

      I'm 36 and I still hear it yay!

    • Aaron Koch
      Aaron Koch Month ago +2

      I’m 45 and can still hear that noise from CRT’s. I’m fact I get the same headache from EV’s.

    • Sylvia-Rusty; Babyfae Sings
      Sylvia-Rusty; Babyfae Sings Month ago

      @Science in Engineering Youre mom probs is also autistic but just in the stereotypically female way, which easily goes unnoticed by medical tests bcuz of, like with ADHD, only lookin for the more stereotypically male presentation of such (thos is cuz research is overwhelmingly done on men, not women; so theres a bias in the data which makes them think things are less common in women)
      Autism (and most neurodivergence) usually runs in the family, its just the intensity of it and how it presents varies from person to person.
      Glad to hear that eventually the intensity of this noise lessened enuf for it to be a nonissue for you. Its def not unheard of for autistics to have the intensity of their exps vary over their lifetimes; and that model usually fits a bell curve where the worst of the intensity is in young adulthood... Which rly sucks bcuz thats also why we so often burnout and cant be independent come adulthood even if we seem to be doin rly good as kids with all the structure and routine to help lessen the intensity of our exps

    • Sylvia-Rusty; Babyfae Sings
      Sylvia-Rusty; Babyfae Sings Month ago

      @Science in Engineering Similarly, some establishments have used the noise to keep teens away

    • Science in Engineering
      Science in Engineering Month ago +1

      @Sylvia-Rusty; Babyfae Sings i seam to lossed the ability to here very high frequency sound over the last 5 years or so. Can't here it any more, just over 40 now.
      Does have a asd diagnosis. My mom could here it past here 60s. Does not have a diagnoses.

  • Gilbert N'orama
    Gilbert N'orama 2 years ago +43

    The amount of thought you've put into this video is directly reflected into its quality. Thank you for this video.

  • HandyAndy Tech Tips
    HandyAndy Tech Tips 5 years ago +1155

    In my opinion, the three best technology channels are 8-Bit Guy, Techmoan, and Technology Connections. It's amazing that a channel with only 18k subs is producing such high quality content. Please keep up the good work.

  • Dave Statler
    Dave Statler 4 years ago +20

    I was a TV & appliance salesman in the early 2000s. We sold CRT, Rear projection, DLP, LCD projection, LCD, and plasma TVs. I look forward to seeing more explanations of how the technology works, since at the time all we had was manufacturer info and limited info available at libraries and almost nothing online.

  • DreamOf944
    DreamOf944 3 years ago +26

    I'm working my way from your newest to older videos for weeks now and this is one of the best with all your humor and voice acting in the narration aswell as the outstanding visualisation. also it's the most comprehensive and accessible explanation of a CRT i have ever seen.

  • Wilmar Soaki
    Wilmar Soaki Year ago +8

    I'm an electronics technician and I've worked for a TV station, so the whole operation of a TV is familiar to me. I want to congratulate you for the video that you were able to explain in a language understandable to most. 👏🏻👏🏻👏🏻👏🏻👏🏻

  • Howard Bee
    Howard Bee 2 years ago +8

    Very good description of the basics. 'm an old guy and made my living in the 60's and 70's servicing these sets. I worked for a dealer that sold Zenith, Magnavox, and Motorola/Quasar. We made service calls to people's homes and carried two big caddies full of tubes. It was an art to set up convergence on a 3 gun delta configured CRT/picture tube. It was said the mark of a good technician was knowing when to quit...

  • XtremeConditions
    XtremeConditions 3 years ago +8

    It's crazy to think about how advanced all of this sounds. Kind of a marvel, even compared to technology today. Awesome video, thanks!

  • jfbaquero
    jfbaquero 5 years ago +390

    I am an university professor and the one thing I can say is: even though their might be errors (we are all human)you are an amazing educator which is not easy to achieve, many people might have the knowledge but explaining things is a very different sort of act, plus making it enjoyable and straightforward is a pretty difficult task. You don't have to be a wizard to appreciate you are doing a lot of research and preparation to create your videos. My congratulations!!! And please keep the great work coming.

    • Gary Raab
      Gary Raab 2 years ago

      Cathode Ray Tube…electron gun!
      I have been watching Sean Carroll's The Big Picture 'videos"...reviewing: the double slit experiment, the electron wave particle duality, the measurement/observer implications, the electron as vibration in the electron field, entanglement, etc.. The mathematical physics word problems in high school entailed electrons as particles ...with an electrical force, magnetic force and force due to gravity acting on the straight line path and momentum of an emitted electron.
      My interest in watching cathode ray tube videos comes from wondering whether the electrons leaving the cathode are emitted as waves or as particles?
      First, I watched this video explaining the ray tube of a black and white TV, with two coils of electromagnets deflecting the "electron" in the X and Y plane via magnetic fields.
      Then in an oscilloscope video, the electron deflection is by electric fields between a perpendicular pair of parallel charged plates.
      If a 'particle' is emitted from the cathode, the magnetic fields generated by the two coil, or by the set of parallel charged plates, directing a particle, or stream of particles, horizontally or vertically, seems reasonably intuitive.
      However, if the electron leaves the cathode as a wave/wave function, do the x and y electric or magnetic fields 'condense' a wave to a particle...or do the x and y electric or magnetic field focus a wave, with a particle 'appearing', 'being observed', with the "observation"... the emission of visible light at the 'detector' - the florescent screen surface?
      At time 11:42 of the oscilloscope video, the image on the screen appears to be very close to an interference pattern around a central bright zone. Hmm!

    • dogchaser520
      dogchaser520 3 years ago +12

      He's very possibly a professor, but being that he's on this channel, probably one in engineering. He's commenting on a Clip-Share video, not doing something professional, and it's not as though he teaches English. "To err is to human." -Dr. Smart Past Man
      Meanwhile, he's right on about the difficulty in teaching well. I think Mr. Connections does a fine job. He would benefit from pauses, however, to allow difficult concepts to sink in. Don't be afraid to let your content "breathe". Your goal is education before entertainment, I think. You don't have to sacrifice the entertainment but you should give a few nods to good pedagogy.

    • Mikael Holmberg
      Mikael Holmberg 3 years ago +8

      Andrew MancheYes because America is the center of the universe. English might not be his native language dude..

  • Ryno
    Ryno 3 years ago +11

    I really admire the amount of effort you put into the production of your videos, you even go as far to make subtitles and as someone who watches everything with subs if it's available i appreciate that alot, thanks for making such interesting content man.

  • fathom70k
    fathom70k 3 years ago +15

    I've watched a lot of videos on how CRTs work but I never really understood it until now. Thank you so much for breaking things down to the individual components and then showing what the each do to build the image. I've never seen anyone do that before.

  • Jim Burgan
    Jim Burgan 3 years ago +1

    I'm an old dude (67 years old) and you have explained how CRT's work in a way that even I can understand. This is an excellent video. Very well produced, and I appreciate it. I've seen a few other videos done by Technology Connections and now I'm gonna subscribe and support. By the way, I lost my ability to hear the waves described at 5:40 long ago (30-40 years ago).

  • Sean Butterfield
    Sean Butterfield 4 years ago +4

    Your videos have given me a much greater appreciation of the use of analog television/VCRs as a modern motif. I really like ContraPoints a lot more now. I'd love to see you discuss the motif of using obsolete devices in both nonfiction and fiction set in the current day.

  • Jeff Harrison
    Jeff Harrison 2 years ago +8

    This was awesome and interesting. You stay on point and give very CLEAR analogies, examples and show
    interesting components (the small CRT without the YOKE attached, and then attached the yoke so people
    now know why it looked that way) all this while straying strictly on point! Most professionals can't do that!

  • Stacy Holt
    Stacy Holt 5 years ago +127

    Just because it is considered outdated technology does not mean that it was simple technology. Thank you for the breakdown.

  • Fabrizio Molinari
    Fabrizio Molinari 3 years ago +1

    Impressive work done here. There should be an Award for such accomplishments.

  • Wes
    Wes  Month ago +2

    It's really cool watching this video on a CRT television. I just kept the old family TV when we upgraded to a flat screen in 2011, and it still works as it used to. Now I can watch the mechanics of analog television play out as it's being explained to me, and that's just so damn cool. I will admit though, having the artificial screech of the video on top of the one that I can pretty easily tune out on my own in your demonstration was absolute murder to my ears.

  • Harley Sheldon
    Harley Sheldon 3 months ago

    I have to thank you, SO MUCH. When I find a channel I like...I watch them constantly. Like, ALL the time. You have taken over my number one spot, and I'm learning SO MUCH thanks to you, and you alone! Such a great channel, can't thank you enough ❤️

  • Zemny - التراث التونسي

    Good job! I found this on the Internet: The CRT TVs average (and median) lifespan is recorded as 15 years, compared to 6 years for the LCD and LED TVs (Fig. 2). I still have a Sony Trinitron from the nineties and it works pretty well

    • Jerome Glick
      Jerome Glick Year ago +1

      My parents still use a JVC set from 1990 as their main TV, and only ever had to get it repaired twice in 32 years.

  • Aidan Brumsickle
    Aidan Brumsickle 3 years ago +1168

    me: ha, I can totally hear the sound and I'm over 25.
    *pauses the video* oh wait i can still hear it. uh oh.

    • Justin Meyer
      Justin Meyer 4 months ago

      Hard to hear anything over the crazy level of ambient droning noise of the microphone, but I did hear some squelching when he was talking during the example window.
      Weird though.. I'm almost 40 and I can hear every one of my CRTs running, but this squelching sounded closer to what I've heard from the few sets I've run across with flyback issues.

    • Rob0neMusic
      Rob0neMusic 6 months ago

      I'm 22 and I already can't hear this anymore. That's weird because I was still able to hear it like several monthes ago

    • Wędrowny Słowianin
      Wędrowny Słowianin Year ago

      I'm in my mid 30s and I can hear it just fine

    • Wendi bnkywuv
      Wendi bnkywuv Year ago

      @The other Sri It's probably not your hearing. Clip-Share compresses the video files to save space, but that also cuts off some of highest frequencies. It also could be that your speakers cannot produce those higher sounds. I found a site (online tone generator) that does not use the compression youtube, and I can hear the 15750KHZ sound. Interestingly, there's also various waveforms available, and the CRT monitors make a sawtooth wave, not a sine wave which is the sound commonly used to demonstrate the high pitched sound of the monitors. I can hear the sawtooth wave clear as day, but sine waves and triangle waves are harder for me to hear at that frequency.

    • Wendi bnkywuv
      Wendi bnkywuv Year ago

      @ThePixel1983 That could simply mean that your speakers cannot produce this frequency, but your headphones can.

  • Neolith100
    Neolith100 5 years ago +89

    This was clearly, extremely difficult to make. I commend you for the energy and time you put into something you obviously care about. This was amazing... not sure if it matters but this is honestly on par with The Secret Life of Machines, just a little more serious.

  • slehar
    slehar 2 years ago +2

    I knew all this stuff. I didn't learn anything new. But the graphical explanation was so lucid and compelling I applaud anyone who can explain this tricky concept in such a clear, visual way! You got me! I've subscribed!

  • Irving Gordon
    Irving Gordon Year ago +5

    Ive been an audiophile for a while but only recently have I gotten into the video side of media with the CRT becoming the focal point of a better vintage video game experience. I love analog technology and how elegant it is, you have a way to bring it to life. Thanks fir the tv data download and futiure ones too.
    liked and subscribed

  • Kiwi Maker
    Kiwi Maker 4 months ago +1

    Awesome video! Im always amazed at how complicated simple things are when you really start asking questions.

  • Rick Gutleber
    Rick Gutleber 3 years ago +4

    Even when you're explaining something I already understand well, you do it in such a clear and entertaining way (including a judicious use of humor), that I'm happy to watch it. Your presentations are always excellent, and your explanations are always clear and concise. Keep up the great work!

    CAPTAIN CLOCK Year ago +3

    I have recently acquired a 14" Philips CRT TV from my aunt who didn't use it anymore, to play my Xbox 360. I was fascinated by how the image looked, I knew how it worked sorta, from when I was very young at around the time of this technology's demise, my dad explained it to me with terms that were understandable to my 5-7 year old self at the time..
    So I simply looked up "How CRT TVs work" and this was the first result. Incredible work, I knew about scanlines and interlacing, but I had no idea my beloved TV was nothing but a single dot of light moving insanely fast! Truly fascinating how it can build the images of my games. I also didn't know about the high-pitched noise, thought the TV was defective.
    Again, very nice work! Will look for the color episode if it exists (even though I have an idea of how it works).

  • skelly
    skelly 5 years ago +165

    Jeez dude, I think I'd be hard-pressed to find a bettery explanation of how CRT TV's worked anywhere else. Such an amazingly well done video. Thanks for the wonderful content, you're one of my absolute favorite channels!

    • jan Kanon
      jan Kanon 7 days ago

      @Hat and?

    • Hat
      Hat 3 years ago

      "bettery" is not a word.

  • Sérgio Domingues
    Sérgio Domingues 4 years ago +9

    As usual, amazing work. I don't think we can thank you enough for making these videos.

  • Timothy Dutton
    Timothy Dutton 4 years ago +3

    You know, I grew up with TV's like this and I never gave a thought to how they worked. In fact watching your video you can actually see what would become a transition from the old oscilloscopes to the TV signals we all watched. I for one remember playing with the horizontal and vertical holds as a child and watching what they did to the picture :). Kudos to you sir.

  • Arthur Durham
    Arthur Durham Year ago +4

    I love your channel, been on a binge. You explain things so well and keep it interesting. I actually understand a lot more about tech I never could grasp before. Also, I'm 30, but that high pitched noise broke my brain and freaked my cat out

  • Going Rogue
    Going Rogue 4 years ago +1

    I actually had a black and white tv with the hold adjustments and such as a child. I functionally figured out how to use them. But, it's really cool to see the coding, and science that made those controls necessary, and just how cool, and nerdy they really were. Thanks man. I also really enjoyed your video on line 21. Mind blowing.

  • Jeff Truck
    Jeff Truck Month ago

    This has to be one of the top videos explaining something like analog TV. I also love the ending shot of the LED flying off the fan. It shows that we’re all human and subject to Murphy’s Law.

  • santi0797
    santi0797 5 years ago +304

    I hope this channel gets many many subscribers, the content is just too good to let it pass, keep this videos coming man, great job!

    • John Balls
      John Balls 3 years ago

      Well, he's got subs now lol

    • Gwen C
      Gwen C 5 years ago

      It's a fantastic channel, truly one that deserves more subs. The way he uses examples, breaks apart technology, and shows how it works is fantastic. Very "interactive" in a way that is difficult to get right in a video.

    • postmachine
      postmachine 5 years ago +1

      i agree. subbed

    • Henry
      Henry 5 years ago +5

      Man I love this channel! It's addicting

    • Adam Bacon
      Adam Bacon 5 years ago +2

      santi0797 - me too very informative and great length too. He does a great job of explaining the information clearly, in plenty of detail, and keeps it entertaining.

  • D. M. Collins
    D. M. Collins 4 years ago +1

    This was the most easy to follow and insightful introduction to television I've ever seen.... or even conceived of. Thanks!

  • Myk Clayton
    Myk Clayton 4 years ago +1

    Brings back a lot of memories...I had not thought about "horizontal hold" and "vertical hold" in years and years and years.
    I'm only on my third video watching this channel, and I am LOVING this. Thanks so much!

  • Scooby Doob
    Scooby Doob Year ago +2

    Wow, that's amazing, a lot to wrap my head around, I may need to watch this twice but holy cow that was really good thank you!
    p. s. nearly 40 and can still hear the sound 😅 in fact I can still here much higher frequencies.

  • Sina Sartipzadeh
    Sina Sartipzadeh 3 years ago +1

    This video was so beautifully detailed and well explained with example shots on the actual TV

  • Alexander Lane
    Alexander Lane 2 years ago +1

    I'd love a follow-up on how color analog tv's work. This was extremely insightful and easy to understand. Amazing how people who didn't fully understand the working behind something were able to harness it to create television. That has to be a near-miracle.

    • roy Yung
      roy Yung Year ago

      It was the same except the RGB signals were encoded onto a b&w signal

  • Kehler Ames
    Kehler Ames 5 years ago +43

    You have a fantastic talent for explaining difficult concepts in easy to grasp steps. Keep up the great work!

  • Kenneth Henrik Olsen
    Kenneth Henrik Olsen 3 years ago +1

    Fantastic information ! There are 4 coils on the Crookes Tube Yoke, 2 coils for vertical and 2 coils for Horizontal deflection. Two circuits, for the coils . The third circuit, lamp-tracer brightness is controlled by the Amplitude, into the Crookes tube electron gun, provided high-voltage from the flyback transformer. What a machine !

  • William Hogue
    William Hogue 4 years ago +1

    This guy is really good. He's very knowledgeable and the best I've seen at explaining these things.

  • G R
    G R 8 months ago

    I am a retired video surveillance field engineer, and this was one of the best explanations of this tech I have ever seen.. well done!

  • ultramaximus
    ultramaximus Year ago +1

    Having worked in the electronics industry for RCA & GE Electronics this is actually pretty on point. I was REALLY questioning how accurate this video was going to be.

    • roy Yung
      roy Yung Year ago

      Just a few non accurate statements. For example the reason there is an interlace and the HV off the flyback

  • Alexis Harper
    Alexis Harper Year ago +4

    Hey, my teacher in my electricity and magnetism class briefly discussed the physics behind a cathode-ray tube works, but left out the rest of how the TV works. I know this is an older video, but perfect timing for my recommendation!

  • mickymackatack
    mickymackatack 5 years ago +84

    This was so well put together! You've got some great design and editing skills to go with your ability to explain in layman's terms!

  • Nick Currier
    Nick Currier 3 years ago

    I am most certainly not one but after binge watching your videos the last few days I feel like an electro mechanical engineer haha but seriously, you make learning about complicated apparatuses and processes easy and accessible

  • Sassafras Stephens
    Sassafras Stephens 2 years ago +1

    The best part of this video was how they aired closed captioning on an anolog tv by using a scan line below the screens display area. This has to be one od the best explanations of a crt tv. Great video!

  • Robert Bolanos
    Robert Bolanos 3 years ago +1

    I was a TV repairmen for over 30 years. This video shows a very good explanation of how a TV works. I have to praise the content producer for many a very accurate explanation of how a TV and explain it where it can be understood to people with no technical training.

  • Silly_B
    Silly_B 4 years ago

    I collect and restore classic arcade games, so I know a fair amount about CRTs. I repair them regularly to keep games alive. Your informative, clear explanation of this complex technology still kept my interest.

  • 2011k1500
    2011k1500 9 months ago

    I spent my first working years in the 80's repairing consumer electronics, mostly televisions. Excellent job on the video. Very well done.

  • denelson83
    denelson83 4 years ago +59

    The "black level" in an analog signal is actually 7.5 on a scale from 0 to 100. The blanking level is at 0 and the lowest part of the signal, known as a "sync pulse" is well below the blanking level, at -40.

  • Andy Peek
    Andy Peek 3 years ago +1

    Awesome, you are a highly clued up young man. Your easy to follow descriptions are wonderful. I wish you good luck with your channel.
    Back in the 70s, my uncle, had a radio and tv business, at the tender age of 16 , I worked for him at weekends. Most TVs were valve (tube) sets, the new colour sets were hybrid, with valves and the new transistors in them. With the old valve set you had about 15000 to 2000 volt HT on the final anode to the tube, to test this you held an uninsulated screwdriver about 1/4 inch away from the high voltage anode to see how big an arc you could draw from the valve, if you got to 3/8 of an inch, all was good. Most faults were from burnt out line output valves, easy fix back then, unplug set, take off back cover, pull out old valve and replace with new one.
    We had 405 lines at 50 cycles in the UK then, in 1968 625 lines in colour were introduced, that made a big difference to picture quality, the system we had was PAL.
    As for NTSC, we jokingly called it Never the same color twice. Whatever, it was fun back then, I really don't why im still alive after what we used to do with electricity.
    Im an electrical refrigeration engineer now, still alive at 64.

  • pluspiping
    pluspiping 5 months ago

    It is kind of delightful that we can now see the most-replayed part of the video, and it's a rather interactive one - the part where we hear the CRT noise sample. It seems a lot of us are testing our hearing!
    At the gray old age of 35 I'm starting to lose that range of hearing, and I have to mash my ear against my laptop's speaker to hear it... but I can still hear my new LED bulbs across the room lmao. Out with one high-pitched hum, and in with another, I guess.

  • All Things M3
    All Things M3 3 years ago +1

    I enjoy building tube circuits. Magic eye eq setup is very cool to watch. And I like using my analog crt oscilloscope over the modern digital. I learned more from using it that I wouldn’t have if I started with a digital. No auto math functions on the analog. Exercise your brain instead of using the digital. But I use the digital also. They are both great.

  • Era1113
    Era1113 3 years ago

    I not only heard the intentional example of the "TV noise" but heard something like it while you were demonstrating with the case off. I have a lot of trouble with electronics around my home because I can still hear those ranges (I'm 30). I recently found out that my wireless phone base makes a high electrical tone when the answering machine number indicator is blinking. Took me ages to figure out what was making it. Only upside is that I can usually hear an electrical problem before other symptoms like charring or melting start to appear.

  • Roman Tercero
    Roman Tercero 2 years ago

    It's astounding how difficult it was to decode or manipulate signals before the digital age. You really had to be ingenious to get around the limitations.

  • onedeadsaint
    onedeadsaint 5 years ago +104

    man, as a kid that noise from a crt would drive me crazy! I could always hear when the TV had been left on. now that I'm older I'm a little sad that I couldn't hear it anymore. stupid hearing loss. stupid aging process.
    love the content! keep it up!

    • Wendi bnkywuv
      Wendi bnkywuv Year ago

      @Glenn Griffon Also youtube compresses the videos to conserve space and thus, the higher frequencies get lost or harder to hear. This probably explains why you're able to hear it on a real CRT monitor, but not in this video. it also should be worth noting that CRT televisions produce a sawtooth wave, whereas much of the sounds I've seen in youtube videos that are used for hearing tests (quite unreliable considering the cutoff is around 15000 to 17000KHZ!!) are actually sine waves. Also your speakers might not reach that frequency well. Put the three together, and there you go! It's as if nothing is there!

    • Wendi bnkywuv
      Wendi bnkywuv Year ago

      Much of society views getting old as a bad thing, but I'd advise not to blame biology, as it might not be biology. If you're going off of the youtube video, don't worry about your hearing. Clip-Share compresses the files down to save space, and in the process removes much of the higher frequencies or makes them harder to hear. Also your speakers might not be able to produce the sound. I've seen many hearing tests on youtube that actually stop producing the sound right around 15600 to 17000KHZ, claiming that if you cannot hear the high frequencies you're losing your hearing. Pretty unreliable. I've even found some that, so it seems, remove the sound intentionally!!

    • roy Yung
      roy Yung Year ago +1

      Usually the fly back is loss to cause that sound to be heard. I used to go into a TV studio since 1960 and if you heard that sound. And engineer would remove the monitors and secure the fly back - no noise

    • Bobby Greene
      Bobby Greene 3 years ago +1

      I can only hear it in my left ear

      IM BEAUTIFUL 4 years ago +1

      I still hear it because I’m 14. It’s super annoying when I walk into stores and hear it

  • RedHeadphones6
    RedHeadphones6 3 years ago +5

    I love how you constantly change the video to be authentic to what you're talking about. Super cool.

  • Anthony Volkman
    Anthony Volkman 4 years ago +2

    Wow extremely excellent videos and you show the internal working as well! Ive worked with electronics for about 17 years and your videos are spot on!

  • Jak's world of retro
    Jak's world of retro 3 years ago

    Im a bit behind but just wanna say you are increasingly becoming one of my favroite channels to watch, cause i love learning about tech, especially older tech. If you do not mind, could i suggest a topic? Since this video mentions raster displays, which is what tvs of the day used, could you do a video on vector displays, like what the vectrex used? Ive always been facinated in crts and recently learned about the two types of crt displays, raster and vector, and would love to see someone like you explain them. Thankyou for you videos, keep up the spread of knowledge, i look forward to your videos :)

  • al4cats
    al4cats 4 years ago +2

    This tutorial on the technologies of television is one of the best I've experienced ever. The presenter is articulate and explains the subject matter in the most unambiguous manner. Thank you.

  • Imre Tanács
    Imre Tanács 3 years ago +2

    This was a very clear, and visual explanation, thank you! I think I'll use part of it in an offline presentation about old CRT-s, giving you full credit, of course!

  • Brian Boni
    Brian Boni 5 years ago +39

    Good job explaining and nice video. My high school electronics class was the last class to build a TV from parts as our final project. That number 15,750 was drilled into my head so hard that I remember it today. Our school bordered Radio Valve Road which was the home of a RCA tube plant that supplied our class with all RCA parts. It was a fantastic experience to actually build something fairly complex and get it working and encouraged me toward electronics as a career.

    • roy Yung
      roy Yung Year ago +1

      @Jeff DeWitt a lose anode would give a corona discharge. What made a loud 15,750 noise was the buyback being lose on the ferrite core. Ever notice why they were glued on the core?? Often that glue dried up this allowing for the coil to "rattle". A toothpick usually cleared this up

    • Jeff DeWitt
      Jeff DeWitt 4 years ago

      @Ben Bart That's what I always thought it was too, and the sound would get worse if the anode connection wasn't tight.

    • Jason Bratcher
      Jason Bratcher 4 years ago +2

      Definitely correctamundo. It's in the way that flyback covers all 525 scan lines but alternating each time going by, hence 525*30 (even though we only got 480 visible lines on the screen).
      Don't forget, too, that your CR tubes were built in at a slant (so the picture would be straight).
      Also, if you ever put your ear next to a CRT and caught a gap of silence on a tv station with nothing native in it (no broadcast messages, nothing visual), just that silence break;
      You're not hearing much of anything from a CRT at this point.
      Then out of nowhere when the advertisements/what-not starts again you get that bit of a forceful snapback against your face?
      That's telling you we're back in session.

    • Ben Bart
      Ben Bart 4 years ago +5

      Correct me if I'm wrong but that sound we all hear is Not the CRT but the horz. / HV Flyback transformer core oscillating at 15,750 Hz.
      I used to rebuild CRT's for 32 years from 1970 to 2002 in phila. Pa.

    • Glenn Lego
      Glenn Lego 5 years ago +3

      Brian Boni A few years ago I attended a class where each of us built a computer that actually worked. Was very interesting.

  • DoomFinger511
    DoomFinger511 4 years ago

    You should do a video on how a Capacitance Electronic Discs works. It was a rare format made by RCA in the 70's that was a vinyl record with extremely small grooves to display video and audio. Instead of a needle going up and down to create sound, the needle would have different levels of electrical resistance based on the groove and then transfer that information to produce audio and video. It came out when VHS and Beta was hitting the market so it flopped. It's incredibly rare.

  • SirBarky
    SirBarky 4 years ago

    Dude, this is incredibly well done. I was looking for some in depth explanations of CRT TVs as the ones I keep finding are too high level and I wanted more electronics details. This was well made, well edited, technically above and beyond (really impressed me with the deconstructed TV with the power supply and adjusting the deflection of the electron gun), and just what I was looking for. I guess I'm still curious how an analog signal from the air was turned into deflection and intensity information at 15khz without digital circuits, seems wild to me still.

    • Jerome Glick
      Jerome Glick Year ago

      It is wild, which is why I love it. This video shows how varying the intensity of a signal with the right timing can vary the intensity of the beam at different spots on the screen. That video signal is what travels in the cable with the yellow plug (composite cable) that runs from your VCR or DVD player to a TV, for example.
      Analog radio and TV are essentially the same thing, one for sound, one for vision. In TV broadcasts, this video signal is modulated (mixed) with a carrier then radiated from an antenna tower at very high power. It's like a voice "screaming" from the tower and all the TVs can sense it at a distance.
      What digital circuits do is break things up into 1s and 0s, which is way more complicated. You don't really need that stuff. The more basic approach is to control the flow of electric signals smoothly, which is as simple as turning a knob to dim a light. That's what analog TV is built off of. And it senses when the signal is low (sync pulse), to self-adjust the deflection timing through feedback loops.
      The 15 kHz is just horizontal deflection rate -- 15,750 lines scanned per second. The entire video signal uses about 4 MHz of bandwidth.

  • poughkeepsieblue
    poughkeepsieblue Year ago +2

    Fun fact, you can remove the flyback transformer from old tvs and make a high frequency power supply, for some really cool electrical effects, including large sparking arc gaps, and ozone generators.

  • Mac Hernandez
    Mac Hernandez 4 years ago

    Thanks for this video now I know how that box we have in the living room works. As a kid I was fascinated with the black & white TV. Now I’m 50 and am really amazed how humans create things. Keep it coming and really love how you explain things. Much support from the Philippines.

  • Patryk C
    Patryk C 8 months ago

    My used to have his workshop where he was fixing TV sets radios and vcrs. I was around age of 10 and was bit curious how those things worked. Nicely explained. Many times on tvs he had to replace the deflection yoke as people would be able to see horizontal line. Or the HV transformer had to be replaced

  • Lake Nipissing
    Lake Nipissing 5 years ago +19

    Absolutely amazing description of CRT operation!
    Incredible what could be done long before computers existed. The complexity involved with CRT analog TV compared with pixel-mapping an LCD is phenomenal. But it worked to provide information and entertainment for millions of people for decades!
    Funny you should mention the high frequency noise of the horizontal oscillator. I remember as a kid complaining to my parents about the high-pitched noise the TV would make, and they were like: "What noise?"
    Look forward to your description of color CRT analog TV operation.

    • Rob Fowler
      Rob Fowler 5 years ago +1

      LakeNipissing Don't forget computers were invented in the days of vacuum tubes. There were a few computers built entirely out if vacuum tubes. One could easily fill a building.

  • douglas gordon
    douglas gordon 2 months ago

    CRT needs 12k to 25K volts depending upon size and if black and white or color. I had special tools to discharge the stored energy in the CRT and another to measure the high voltage. Replacing a big color CRT was allways a little scarry. Great description of early television.

  • 9er nation 4-life
    9er nation 4-life Month ago

    I enjoyed this very much 😁
    Great job with all the details
    Thank you for explaining it in a way that makes sense 👍

  • BoredWithUsernames

    Absolutely fantastic explanation, an inspired video very well explained. Top marks and thanks for presenting this in a way that everybody can understand. Now subbed ;)

  • Frank Roberts
    Frank Roberts 2 years ago +1

    You correctly stated that the amplitude of the visual carrier of an analog TV signal dictates the brightness of the 'flying spot' that renders the image on the receiver CRT. What is often overlooked is that the relationship between carrier level and image brightness is inverse. In English, that means that as the visual carrier power increases, the image becomes darker. The transmitter actually broadcasts a negative image that is inverted again in the video amplification stages of the TV receiver before it is passed on to the picture tube.
    This might sound a bit counter intuitive, but there are a couple of very good reasons to do this. First, as analog TV signals degrade, either over long distances or in heavy interference, the picture quality degrades slowly. The image will become snowy and somewhat indistinct, but will remain watchable until the picture signal fades out completely. As you pointed out, the synchronization and framing pulses in the horizontal and vertical blanking intervals are transmitted at 'blacker than black' video levels, which, were the carrier not inverted, would be represented by carrier cutoff, or no carrier at all. In a less than ideal reception scenario, these sync pulses would be attenuated before the rest of the active video and lost. Without these synchronization pulses, all the rest of the video would become an unwatchable mess. By inverting the video, blacker than black sync pulses are represented by the maximum carrier level that the transmitter can produce. This means that these signals are the most powerful and therefore the last to fade, so the receiver will continue to produce a watchable picture, even if the picture quality is severely attenuated.
    Another reason for inverting the video at the transmitter has to do with operating costs (naturally). In order to maintain good picture quality, the high power amplifier stages of an analog TV transmitter must exhibit exceptional linearity. This requirement dictates that these amplifiers be biased for minimal distortion in either class A or class AB mode. Without going into a lot of amplifier theory, linear amplifiers trade off high picture quality for low energy efficiency. A high powered analog TV transmitter literally sucks in electricity during operation. Were the video not inverted, the transmitter would have to work a lot harder since most of the active video, on average, depicts high average picture levels (APL). By inverting the video signal, the transmitter only has to run full blast during the sync pulses, which account for less than 2% of the transmitted video signal. Since full power TV transmitters can consume $8,000-$10,000 in power monthly, anything that seriously improves power efficiency is going to be implemented.

  • No-one
    No-one 6 months ago

    This is around the 6th video I've watched to try and learn the basics about video transmitting and how it works. It's like watching all the previous 5 combined and improved lol. Very easy to comprehend the explanations and descriptions.

  • DavidGjam
    DavidGjam 5 years ago +22

    To my knowledge, you're honestly the first person to ACTUALLY explain in detail how analog TV works, before you, I had to look at old PDFs and stuff.
    Keep it up and I'm SURE you'll get many thousands of subscribers!

    • Leo G
      Leo G 3 years ago


    • Rob Fraser
      Rob Fraser 4 years ago +2

      You don't want to be spending your time around PDF files.

  • Mneros
    Mneros 2 years ago

    This was fantastic! thanks. perfect example of how a passionate Clip-Share content creator produces better content then the History and TLC combined.
    you made mention at the beginning about todays digital imaging and how its kinda "meh" in its operation (Paraphrasing). As a kid CD's where new and I was fascinated by them. We had a huge library of Vinyl records so to see CDs I was in Awe. As I grew up and the world became more digital i look back at a Vinyl record and i'm more in awe of that technology then digital sound. think about it some one came up with this crazy idea to capture sound by scaping it in to plastic.

  • Colprit At Large
    Colprit At Large Year ago

    Wanna say, appreciate the two epilepsy warnings. Was able to scroll down in time. It's a very thoughtful and meaningful thing to do and one I wish more creators did.

  • Garry Grierson
    Garry Grierson 3 years ago +1

    Good explanation, but it made me realise that there is now a whole generation that doesn't remember CRT TV's! It's weird that something that was so ubiquitous is now considered obsolete or 'retro' by some people. And yes, in 2019 I still have many CRT TV's and monitors. I even have a few vector monitors.

  • Kim A.
    Kim A. 8 days ago

    I watch several old Cathode Ray Dude episodes, and Clip-Share decides I would be interested in your older episodes as well. Thank you Clip-Share! Very good episode, I always learn from and enjoy your channel; then and now.

  • Serenity
    Serenity 3 years ago

    I worked on old army helicopters and the multifunction display (mfd) was cathode ray tube in the kiowa ,I understood how cathode ray tubes (crt) operated but not how it was controlled, this is super cool!

  • michael adams
    michael adams 5 years ago +158

    There is nothing wrong with your television set. Do not attempt to adjust the picture. We are controlling transmission. If we wish to make it louder, we will bring up the volume. If we wish to make it softer, we will tune it to a whisper. We will control the horizontal. We will control the vertical. We can roll the image; make it flutter. We can change the focus to a soft blur or sharpen it to crystal clarity. For the next hour, sit quietly and we will control all that you see and hear. We repeat: there is nothing wrong with your television set. You are about to participate in a great adventure. You are about to experience the awe and mystery which reaches from the inner mind to the outer limits.

    • roy Yung
      roy Yung Year ago

      @Craft Paint haha I worked in broadcast and played back the video you must have watched!
      The lineup was:
      The news (read by the announcer)
      Then the national anthem
      Then color bars with a 440hz tone (later years changed to a 1khz tone) what we called bars & tone
      Then maybe static when the transmitter when off the air for maint
      In the morning the lineup was:
      national anthem
      Morning prayer
      The news (read by the announcer)
      Then the daily program would follow most times it was "the American farmer

    • John Balls
      John Balls 3 years ago +1

      @John-Del I'd buy that for a dollar!

    • John-Del
      John-Del 3 years ago

      @Elijah Ford’s Idiotic Variety Show Throw in a Super Shammy and I'll take two!

    • Elijah Ford’s Idiotic Variety Show
      Elijah Ford’s Idiotic Variety Show 3 years ago +3

      That would never happen to a Supa Mega Pixel Pro Smart TV 2000! Buy a Supa Mega Pixel Pro Smart TV 2000 today!

  • codemiesterbeats
    codemiesterbeats 3 years ago

    good explanation, had a general idea but was always a bit confused as to how a single electron gun did all that work. Basically this video also unintentionally taught me how an oscilloscope works.

  • Mrs. Bradly Cooper
    Mrs. Bradly Cooper Month ago

    The inventor was extremely smart to be able to figure all this stuff out. I know that you do a lot of research to make your content. You have to be really smart as well to understand everything you research. Kudos

  • Retro Gadget Man
    Retro Gadget Man Year ago +1

    Brilliant explanation!. I used a similar black and white TV, "the one you took apart" to build my steampunk Sega master system. These old bw CRTs still have uses.

  • Fidel Cashflow
    Fidel Cashflow 4 years ago

    Bravo! So much work, so nicely put together and presented

  • that one lonely eagle
    that one lonely eagle 2 years ago +1

    I loved the sound the tv made when turned on, that warm sound of just kicking back nostalgia of a show coming on or a movie! Something modern tv's just don't give.

  • Dave Burgess
    Dave Burgess 4 years ago +3

    Got to be one of the best explanations of analogue TV I've seen. The physical demonstrations on an actual CRT worked so much better than a dry text book description.

  • Joseph Gordon Jr
    Joseph Gordon Jr 2 years ago

    There is another part that extended lower known as the sync pedestal which is transmitted by the camera and extends a little below the blanking pedestal. I used to work on industrial monitors and viewed the wave form on an oscilloscope .( b&w )

  • omarmang navy
    omarmang navy 4 years ago +1

    Amazing video, thanks for all the time and effort you putin to this.

  • Kelly Higgins
    Kelly Higgins 3 years ago

    Very well done video. Great editing and to-the-point information. I enjoyed it a lot! Subbed

  • Nomen Unknown
    Nomen Unknown 11 months ago

    Slow Mo Guys did a great video on capturing the processes different televisions go through to create a picture. Watching a CRT scan line slowly race across a screen is still one of the most satisfying things I’ve ever seen. Here’s the video: clip-share.net/video/3BJU2drrtCM/video.html

  • Bernhard Wagner
    Bernhard Wagner 6 months ago

    Over the years I heard and remembered all the key terms. You are filling all the gaps. Thank you.

  • Chelsea Elyn
    Chelsea Elyn 4 years ago +7

    This was a phenomenal video! I’ve been interested in old technology for awhile, and you explained this perfectly!

  • Chubby Adler
    Chubby Adler 3 years ago

    I have a thought experiment I would like to check on.
    The current analog TV signal is mostly amplitude modulated to convey its intelligence (with a frequency modulated audio carrier, though that too is carried in an amplitude modulated signal). One problem I keep running into is that amplitude modulation is very easy to interfere with. However, frequency modulation seems to reject just about all interference, though its primary use has traditionally been for audio. What would be the effects as far as both the signal and the performance of TV's using a resemblance to the NTSC and PAL standards that were used, had the entire TV signal been frequency modulated?

  • slehar
    slehar 2 years ago

    I knew all this stuff! (I'm an old timer from the olden days) But I love to hear you explain it! You make it so clear! Thanks!

  • Gregg
    Gregg 3 years ago +1

    Oh, I loved messing with CRT's. I used to love taking them apart when I was a kid. (13yrs old).
    My uncle is a electronic engineer, and also has a doctorate in computer science. That's why I really got into electronics. Watching him work on various things on the side. Used to fix radios, computers etc.
    Anyway, awesome video dude, I love this channel!