This video made me remember suddenly that I've watched UA-cam on a real tube, using the Wii app of all things, in the last few years of service of a Sony Trinitron TV... which happens to be another topic covered by this channel.
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.
I worked in a TV repair shop at 16 with a state issued apprentice license. My boss trusted me to make house calls even though I wasn’t supposed to. You should see i the looks I got when I’d show up to fix a TV at someone’s house on a Saturday and then I’d fix it.This was in 1969 and the shop I worked in sold the Motorola works in a drawer. Worked on electronics and telecommunications equipment 50 years of my working life. I’ve seen some pretty cool stuff and always worked for companies that had the latest equipment.
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.
And magical how simple some things turn out to be. When I was very young, we had a shower radio that played audio from VHF stations, so you wouldn't miss the game, the morning news, etc. Back then, I assumed it was some device to convert "TV" into "radio". But TV audio _WAS_ "radio" in that sense: a separate signal.
@@jnhartonFun fact: modern video hardware still has blanking lines. That is to say, digital data streams meant for modern displays still have a bunch of zeroes to encode a blanking signal. There are modes without vblank and/or hblank, which put that bandwidth to better use, and can therefore encode higher resolutions.
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.
Well, I don't really think it's true that you're a university professor because you said "an" instead of "a". You also started a sentence without a capital.
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.
HandyAndy Tech Tips I'll give you another channel to check out... Oddity Archives. On that show, Ben takes viewers on funny yet informative trips back to yesterday to look at either pieces of tech that kinda disappeared over time or tech issues that gave us strange headlines. His first episode covers 'The Max Headroom Incident'... 'Nuff said!
If you want to learn something a bit more deeply, then you could do a lot worse than the MIT lectures and similar from other universities, a complete free BSc course... Then there is simply the best pure electronics channel, EEVBlog with Dave Jones. Then I recommend Shango066 for radio and lunacy. Techmoan is pure genius. Fully agree, and 8 bit guy is great too. This guy makes brilliant videos, but he does make a lot of errors and misses out on some technicalities - which I'm not complaining about, but it should be noted.
I'm ~40, but I still can here some of it... however I'm suspecting that I might be hearing some lower resonance frequency of it since the sound really didn't sound like 15kHz (and I've tested that my hearing ends around 14kHz at least couple of years ago)... my daughter did hear the real sound loud and clear. I asked how loud is the sound and she told me it was around the same level that the voice of the speaker dude (sorry, cannot remember the name 😅).
@@nerdylittlesideprojects9141 That's probably so. I'm 40 and have always been able to hear CRTs (and other oscillator circuits) in operation, but I can't hear the one on this video.
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...
It's funny to me that tough love for the innards of old TVs, the art of a good hard whack on the side of the set to bridge a connection, has carried over through media as a cathartic ritual. I'll see people socking kinds of malfunctioning electronics where that couldn't possibly help, but... hard to blame them...!
I'm 54 and can still hear it. back in the day I could walk into any house and tell if a t.v. was on. You should have commented on the advent of the analog phase-locked loop, which made the h-hold and v-hold automatic, but that will be covered in the color video. NTSC never the same color.
It annoyed the hell out of me last year. After 1-2 hours playing my ps2 on a huge crt tv, it would start doing this sound and noone would even hear it! I turned off the tv and back on, it stopped and I didn't know why is this happening
@@joskad6569 some people say you can just put some epoxi to glue it to the pcb so it wont vibrate. also some tvs and monitors had an option to DEGAUSS the screen: en.wikipedia.org/wiki/Degaussing#Monitors
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.
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. 👏🏻👏🏻👏🏻👏🏻👏🏻
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).
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!
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!
@ onedeadsaint: me too >_< When you are younger your ears are a lot more sensitive to higher frequencies but even now in my early 30s i can hear that high pitched noise from CRT TVs. However i never heard that nagging noise on 100 hertz TV sets.
i couldent hear it in the video, but i went and plugged in the old crt tv thats just been sitting in my basement for years and i could still hear the sound. most likely, your speakers just cant produce the sound, nor can mine.
I'm 36 and I can still hear the sound when I switch on a real CRT but I didn't hear it in the video so I blame my headphones. I've always liked the sound personally. Maybe it's just cause I'm weird. I never actually connected it to a sound though. I always described it as the density of the air around my ears changing. Since that was the best description I had for it, not knowing what pitch was or that even sound could be at those kinds of ranges. Yeah, I was a ditzy chick lol. But no one ever actually explained that kind of thing to me and when I described it to my parents or to teachers (when I would hear it in school anytime I was near a classroom that was watching a video) no one understood what I meant at all. I'd even try to demonstrate it to them by telling them to relax and unfocus their minds and just listen for the air to change before cutting a TV on. Surprise surprise, no one understood and I didn't understand it was a high pitched sound so I couldn't rub it in their faces that I was hearing something real they couldn't hear because they were old. I still like the sound. Every time I hear it I prick up my ears like a dog hearing a whistle. And when people ask wth is up I just say "I feel a disturbance in the force."
I agree, these are first class videos with a ton of effort put into each one. I learn so many cool things in each one. I really wish you much success, keep up the great work.
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.
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.
Shhhh. Don't say that. SERN is probably watching out for competitors over the timeline. Now they know you're vying for world control it might be too late. Quick, I sent you a text 25 hours ago with a coded message on where to meet up. Bring Dr Pepper.
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.
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.
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.
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.
@@JeffDeWitt 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
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!
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).
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!
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.
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.
Thank you, thank you, thank you!!! I’ve been reading about this topic for weeks, and had a slight grasp on the concept, but the visuals and demonstrations you provided finally made it click. I’m so grateful that you made this video (6 years ago at this point). I still have a lot of research to go, but this really helped. I’m excited to explore the rest of your content.
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!
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.
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.
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.
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.
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.
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
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!
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.
John Buluba yeah, they always say older people can't hear that. I think it's funny, because I'm 32 now and have worked in construction in a very high noise environment for over 14 years but I still hear that kind of stuff just fine.
CoolDudeClem I did an ABX blind test to see if I can hear the ultrasonic frequencies beyond 20kHz in HD FLAC files. I didn't pick up the ultrasonic waves but I discovered that my sound card driver has anti-aliasing issues that reflect distorted ultrasonic frequencies into the audible range. So the ABX test illuminates our internal human biases.
26yo audiophile and I lost track of the amount of times I've come back to this video just to have a personal "yay I can still hear above 15kHz" and a "oh how that sound radiates with nostalgia" in the same instant. Talk about a high deflection rate.
@@Hat- I can barely hear it in my right ear but in my left ear it is very loud. I'm also 12 but I am slightly use to it because I still use a crt for retro gaming but I do only use a 9 inch and I think he boosted how loud it was.
Just turned 45, and although faintly, I heard that noise...reminds me of my childhood, when the picture tubes had to warm up, and our TV was a Zenith "Cabinet" tv that had doors that you swiveled to hide the screen when you weren't watching it....I remember going from "Rabbit Ears", where we only had like 6 channels, to cable...here in San Jose (Silicon Valley) it was called Gill Cable, and it had an "A" and "B" switch behind the tv that allowed you to choose between multiple banks of channels...and we had a BetaMax machine on top of that TV with a corded remote control...I remember my Dad was proud of that set-up, it cost A LOT of money when it was new....
We had a huge outdoor antenna with a knob to turn it. We got 6 channels on a good day. We also had a Betamax with corded remote, but it was broken. (Or maybe we just thought it was because we only had VHS tapes?)
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!
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!
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.
Your voice is so freaking calming I actually slept in while watching this video and then the blooper came up and it completely scared the crap out of me half asleep xD
After all these years of watching your channel, I went back to find this very video- because your bit that starts at 4:59 is one of my FAVORITE OF ALL TIME TECHNOLOGY CONNECTIONS MOMENTS I love it so!
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.
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
Whenever possible I adjust the TV to eliminate overscan as much as possible as I value an intact image over hiding the closed caption info. I even do this on flat panels by putting it in to 1:1 pixel mapping mode. My Toshiba calls it Native mode. Flat panel TVs unfortunately emulate overscan by scaling the image up a few percent and then cropping all 4 sides. So even if you are watching a 1920x1080 image on a 1920x1080 screen it often isn't just displaying it as-is, it scales whatever resolution it gets up to for example say 1952x1098 then crops 16 pixels from each side and 9 each from the top and bottom. The exact numbers don't matter, what matters is that scaling reduces picture quality and cropping of course robs you of some image that is supposed to be there.
yeah i too prefer the "just scan" method instead of having to deal with image crop. I refuse to accept any kind of safezone image crop nowdays. Because that is shit that we have thankfully overcome through technological progress. It's just a problem sometimes when you watch movies and shows with their old Broadcast master that has TV safezone crop in mind and now you see the flaws around the edges of the frame.
My family still has a Samsung plasma TV, and I assume the cropping is to accommodate the burn-in protection, which shifts the image by a few pixels every 10 minutes or so. The "Just Scan" picture size turns the protection off, and for some reason, isn't available when the image is in 720p (but is available on 1080i). (Personally, seeing all of the image is weird since there's so much unused space along the edges (though it's more the fault of graphic designers trying to accommodate sets that don't have a "Just Scan" option), so I usually just leave the image on regular 16:9 "cropped" mode.)
I watch several old Cathode Ray Dude episodes, and UA-cam decides I would be interested in your older episodes as well. Thank you UA-cam! Very good episode, I always learn from and enjoy your channel; then and now.
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
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.
I'm 32 and could here that nasty sound over my tinitus, don't know if I should feel good about it. LOL. Your videos are absolute genius. Love how clear you explain things, love them. What an amazing job you do!
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.
I'm 30 and I still heard the sound at 11:57 VERY clearly. That actually made my day. This also explains why both my sister and I could 'hear' from upstairs if the basement TV was on even if nothing was playing on it.
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.
I remember the noise as a kid being much more of a hiss than a whine. I can still very much hear it in this video, both at 5:41 and 11:57, and boy is it unpleasant. Either my ears have gotten MORE sensitive in the last twenty years, or the TV sets I dealt with back then had better noise dampening/isolation than the ones being demoed. As a matter of fact, we still use CRTs for preview monitors in the AV production world, and I've never heard them make any noise other than the slight "electronic" noise of the tube being charged.
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.
I think 95% of T.C. suscribers already know how analog TV works, and 100% of those still want to watch the video, knowing your explanation will make for a fantastic video!
5:41 I actually paused this to see who was watching TV downstairs before remembering we don't own any CRT TVs and realizing it was coming from the video.
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!
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
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 ❤️
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.
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.
That's a frequency of about 15,700 Hz. I'm 34 and can hear up to 17,500 Hz. It's not that uncommon. That high pitched sound reminded me, why I hated most CRTs. On a side note...Do I know you from the WMD forum? Your name and avatar seems familiar.
raafmaat I wonder if people who have an annoying wife and go deaf would say the same thing? "I'm glad I can't hear her anymore, I remember how annoying the sound was when we first got married" :p
SandyStarchild Does it have a chapter on not dying? Make sure you look into stored charges in large capicitors. He only mentioned the high voltage when the tv is on. But many kids died from playing inside the back of a tv set that had been disused for years just because the power supplies had large capicitors capable of holding s charge for years. Long about the 1980, they started adding bleeder resistors that would allow the caps to drain their charge over time. Also, as the wires get old, hi voltage lines that look perfectly fine can begin to arc. So reaching in while it's turned on can make you the most convenient path to ground.
>But many kids died from playing inside the back of a tv set [citation needed] For decades people have challenged the people who make such claims to cite even one documented instance of someone being electrocuted by a CRT-based TV/monitor, and as far as I know, no one has done it yet.
@MaximRecoil i didnt die but i was "bitten" many times messing with crt tvs , the biggest bite was from the anode on a 26" tv , i forgot to discharge it and lifted the rubber flap put my thumb under to release the wire clip , felt like id hit it with a hammer :-(
I remember Black and White TV. You did have to adjust the horizontal Hold for the left and right, Just like he did. And the vertical hold really did make the TV picture scroll. I adjusted it all the time as a kid in the 1970' s and 1980's. And moving the rabbit ears Antennas! And that high pitch! I remember that! Great Job explaining how TVs work! It was very understandable! My Vocational Technical High School Electronics teacher was a Color TV technician, and he explained how he got a TV Repairman Job, by writing a technical report on how Color TV's worked! And that was when Color TV's were brand new! He worked in the Electronic Field a Long time and then taught Electronics in Vocational Technical School to his Class of 1984'! His name was Mr. William C. Palmer! He was a great teacher! And you are a great teacher too, Technology Connections!
Did you edit in a hearable sound into your video when talking about the audible noise that people above 25 can't hear? Or did you use the real noise? Cause I'm 33 and I was able to perfectly hear it and it was a pretty annoying sound, so I think i was hearing it very well.
I've not been able to hear it, but since it is coming via speakers, rather than an actual CRT, it's a combination of factors for me, especially as I can still hear it on the more powerful CRTs even today. A lot of it depends on the power of the audible signal for me, but I've also been dealing with high frequency hearing loss and tinnitus most of my life.
@@jgkitarel Also youtube compresses the files to save space, but that also reduces or even cuts out the higher range frequencies. Also your equipment may not be capable of producing that frequency.
I'm 34 and I've been able to hear that noise my entire life, including during this video. I never listened to loud music and therefore didn't destroy my hearing. Or I'm a mutant, not sure which. And yes! I realize this video is just over three years old, but I've been going through this amazing channel's videos!
im 30 and can definitely still perceive the ringing as you put it into the video. im not sure if i truly hear it so much as /feel/ it in my ears, but it was definitely tangible
The clearest and simplest explanation of a CRT I've seen on the net. Thank you
Yeah pure and simple, ..uh oh isn't that an ad
much better explanation than whatever the architect said in the Matrix.
This video made me remember suddenly that I've watched UA-cam on a real tube, using the Wii app of all things, in the last few years of service of a Sony Trinitron TV... which happens to be another topic covered by this channel.
@@MegaZetalol I did the same too although it wasn't a Sony. I think it was some off brand but it had component inputs and was an amazing 480 PPPPP
@@ax14pz107 I could do the same if I connected my CRT computer monitor to my laptop.
Just because it is considered outdated technology does not mean that it was simple technology. Thank you for the breakdown.
Yes, especially the sync generators
Analog is definitely more complicated than digital
The high pitch whenever the TV was on screen was mind-numbing...thanks for calling this 31-year-old "young"
Lol, same and I'm nearly 38.
I thought It was just me hearing it! Lol
Lucky for me, tinnitus makes it unnoticeable.
@@starkmouth "Lucky"
@@isaacm1929 “luckily”
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.
I worked in a TV repair shop at 16 with a state issued apprentice license. My boss trusted me to make house calls even though I wasn’t supposed to. You should see i the looks I got when I’d show up to fix a TV at someone’s house on a Saturday and then I’d fix it.This was in 1969 and the shop I worked in sold the Motorola works in a drawer. Worked on electronics and telecommunications equipment 50 years of my working life. I’ve seen some pretty cool stuff and always worked for companies that had the latest equipment.
RIP.
Heterodyned.
You're essentially describing "terrestrial pay TV" services like ONTV, Preview, Spectrum, SelecTV etc.
Beginning of the end?
In Germany too. If you use a tv-card, the pc can unscramble it on the fly
Electronics, even the kind that we've "outgrown", never stops being magical to me
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.
Specially the ones that we've "outgrown"
And magical how simple some things turn out to be. When I was very young, we had a shower radio that played audio from VHF stations, so you wouldn't miss the game, the morning news, etc. Back then, I assumed it was some device to convert "TV" into "radio". But TV audio _WAS_ "radio" in that sense: a separate signal.
@@jnhartonFun fact: modern video hardware still has blanking lines. That is to say, digital data streams meant for modern displays still have a bunch of zeroes to encode a blanking signal. There are modes without vblank and/or hblank, which put that bandwidth to better use, and can therefore encode higher resolutions.
Very nice work.
I love it when youtubers comment on each others videos - community at its very best
You are awesome
Wow the 8 bit guy on a technology connection’s video, cool
I wasn’t aware you left comment on this video until today.
Agreed.
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.
Well, I don't really think it's true that you're a university professor because you said "an" instead of "a". You also started a sentence without a capital.
@@nostalgiachase And their instead of there.
l0l
"(we're all human)" now that's cool
I agree with the sentiment, if not the grammar, spelling, and punctuation. (If ESL, you get an exemption!)
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.
HandyAndy Tech Tips I'll give you another channel to check out... Oddity Archives.
On that show, Ben takes viewers on funny yet informative trips back to yesterday to look at either pieces of tech that kinda disappeared over time or tech issues that gave us strange headlines. His first episode covers 'The Max Headroom Incident'... 'Nuff said!
Popularity is no measure of skill, so it's not that surprising to me. That being said, this channel deserves many more subscribers.
I agree, just to add to the list EngineerGuy is also up there.
If you want to learn something a bit more deeply, then you could do a lot worse than the MIT lectures and similar from other universities, a complete free BSc course...
Then there is simply the best pure electronics channel, EEVBlog with Dave Jones. Then I recommend Shango066 for radio and lunacy.
Techmoan is pure genius. Fully agree, and 8 bit guy is great too.
This guy makes brilliant videos, but he does make a lot of errors and misses out on some technicalities - which I'm not complaining about, but it should be noted.
I'm subscribed to all of those
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.
Oh no, me too. :|
11:56 I am so happy that even if I am 40 now, I can still hear this noise very clear 😃 (but only with my headphones)
I'm ~40, but I still can here some of it... however I'm suspecting that I might be hearing some lower resonance frequency of it since the sound really didn't sound like 15kHz (and I've tested that my hearing ends around 14kHz at least couple of years ago)... my daughter did hear the real sound loud and clear. I asked how loud is the sound and she told me it was around the same level that the voice of the speaker dude (sorry, cannot remember the name 😅).
@@nerdylittlesideprojects9141 That's probably so. I'm 40 and have always been able to hear CRTs (and other oscillator circuits) in operation, but I can't hear the one on this video.
i'm 29 and that sound make me uncomfortable
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...
It's funny to me that tough love for the innards of old TVs, the art of a good hard whack on the side of the set to bridge a connection, has carried over through media as a cathartic ritual. I'll see people socking kinds of malfunctioning electronics where that couldn't possibly help, but... hard to blame them...!
I'm 54 and can still hear it. back in the day I could walk into any house and tell if a t.v. was on. You should have commented on the advent of the analog phase-locked loop, which made the h-hold and v-hold automatic, but that will be covered in the color video. NTSC never the same color.
It annoyed the hell out of me last year. After 1-2 hours playing my ps2 on a huge crt tv, it would start doing this sound and noone would even hear it! I turned off the tv and back on, it stopped and I didn't know why is this happening
@@joskad6569
some people say you can just put some epoxi to glue it to the pcb so it wont vibrate.
also some tvs and monitors had an option to DEGAUSS the screen:
en.wikipedia.org/wiki/Degaussing#Monitors
Ma ON same i thought i was the only one but im 16 tho
Meanwhile I am 22 and cannot remember to have heared it at all in my life.
Ma ON Strange. You must have very good hearing still, to be able to hear such high-pitched sounds.
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.
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. 👏🏻👏🏻👏🏻👏🏻👏🏻
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).
The amount of thought you've put into this video is directly reflected into its quality. Thank you for this video.
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!
"bettery" is not a word.
@@Hat- and?
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!
Yeah, I remember hearing the CRT when I was younger. You want to know my trick? I turned up the volume high enough to block the high pitch noise.
@ onedeadsaint: me too >_< When you are younger your ears are a lot more sensitive to higher frequencies but even now in my early 30s i can hear that high pitched noise from CRT TVs. However i never heard that nagging noise on 100 hertz TV sets.
i couldent hear it in the video, but i went and plugged in the old crt tv thats just been sitting in my basement for years and i could still hear the sound. most likely, your speakers just cant produce the sound, nor can mine.
I still hears it 19 years later, resistor noice, capacitor noice, tube noice etc, it made my head hurt exposed to it for a extended periods
I'm 36 and I can still hear the sound when I switch on a real CRT but I didn't hear it in the video so I blame my headphones.
I've always liked the sound personally. Maybe it's just cause I'm weird. I never actually connected it to a sound though. I always described it as the density of the air around my ears changing. Since that was the best description I had for it, not knowing what pitch was or that even sound could be at those kinds of ranges.
Yeah, I was a ditzy chick lol. But no one ever actually explained that kind of thing to me and when I described it to my parents or to teachers (when I would hear it in school anytime I was near a classroom that was watching a video) no one understood what I meant at all. I'd even try to demonstrate it to them by telling them to relax and unfocus their minds and just listen for the air to change before cutting a TV on. Surprise surprise, no one understood and I didn't understand it was a high pitched sound so I couldn't rub it in their faces that I was hearing something real they couldn't hear because they were old.
I still like the sound. Every time I hear it I prick up my ears like a dog hearing a whistle. And when people ask wth is up I just say "I feel a disturbance in the force."
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!
I agree, these are first class videos with a ton of effort put into each one. I learn so many cool things in each one. I really wish you much success, keep up the great work.
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.
Man I love this channel! It's addicting
i agree. subbed
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.
It's crazy to think about how advanced all of this sounds. Kind of a marvel, even compared to technology today. Awesome video, thanks!
“Do not attempt to adjust the picture. We are now in control of the transmission.”
Had to.
@Chas Maravel The Outer Limits !!!!!!!!!!!! XD
Now I get that! The more you know, huh?
We control the horizontal, the vertical, up down left right. Don't touch your remote. we are here, we are watching. stay tuned....
Aww yeah I kinda messed It up didn’t I haha 😆
Shhhh. Don't say that. SERN is probably watching out for competitors over the timeline. Now they know you're vying for world control it might be too late.
Quick, I sent you a text 25 hours ago with a coded message on where to meet up.
Bring Dr Pepper.
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.
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.
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.
Brian Boni A few years ago I attended a class where each of us built a computer that actually worked. Was very interesting.
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.
@@benbart5711 That's what I always thought it was too, and the sound would get worse if the anode connection wasn't tight.
@@JeffDeWitt 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
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!
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).
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!
You don't want to be spending your time around PDF files.
r/agedlikewine
You have a fantastic talent for explaining difficult concepts in easy to grasp steps. Keep up the great work!
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.
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.
Thank you, thank you, thank you!!! I’ve been reading about this topic for weeks, and had a slight grasp on the concept, but the visuals and demonstrations you provided finally made it click. I’m so grateful that you made this video (6 years ago at this point). I still have a lot of research to go, but this really helped. I’m excited to explore the rest of your content.
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!
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.
Called IRE units
Later known as IEEE units.
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.
I love how you constantly change the video to be authentic to what you're talking about. Super cool.
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.
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.
awesome
6:39 - my favorite part. That laughter! Perfect :D
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.
michael adams Please stand by
The Outer Limits... Please Stand By.
How scarier would that have been read out in a BBC English accent and backed with the nightmarish tunes of the BBC Radiophonic Workshop?
I still remember channel sign-offs.
@@GeoNeilUK Or how scarier still if it had been read out by a Scouser. "We kcontrol thu veeeeeertickle"
Awesome man, such good info, keep up the good work!! :)
No
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
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!
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.
This was a phenomenal video! I’ve been interested in old technology for awhile, and you explained this perfectly!
Thumbs up everyone who can hear the high pitched sound from the crt after 5:41
John Buluba yeah, they always say older people can't hear that. I think it's funny, because I'm 32 now and have worked in construction in a very high noise environment for over 14 years but I still hear that kind of stuff just fine.
CoolDudeClem I did an ABX blind test to see if I can hear the ultrasonic frequencies beyond 20kHz in HD FLAC files. I didn't pick up the ultrasonic waves but I discovered that my sound card driver has anti-aliasing issues that reflect distorted ultrasonic frequencies into the audible range. So the ABX test illuminates our internal human biases.
John Buluba fkn hate 20hz flyback transformers grr
maybe you got smallass ears nevir
I heard a little, but I'm not sure I've heard the whole of it. (I'm 30 y.o.)
26yo audiophile and I lost track of the amount of times I've come back to this video just to have a personal "yay I can still hear above 15kHz" and a "oh how that sound radiates with nostalgia" in the same instant. Talk about a high deflection rate.
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!
this channel deserves more subscribers for it's level of quality
Makes me feel so old that I can't hear that damn TV sound anymore :(
I can barely hear it and I'm 12.
I'm pretty sure youtube compression and the speaker you're using have a lot of influence as well.
@@Hat- I can barely hear it in my right ear but in my left ear it is very loud. I'm also 12 but I am slightly use to it because I still use a crt for retro gaming but I do only use a 9 inch and I think he boosted how loud it was.
Don’t think we’re in analog any longer. We’re doing digital.
@@Hat-
Do you play your music aloud?
I heard that sound just fine, and I’m only 20.
Just turned 45, and although faintly, I heard that noise...reminds me of my childhood, when the picture tubes had to warm up, and our TV was a Zenith "Cabinet" tv that had doors that you swiveled to hide the screen when you weren't watching it....I remember going from "Rabbit Ears", where we only had like 6 channels, to cable...here in San Jose (Silicon Valley) it was called Gill Cable, and it had an "A" and "B" switch behind the tv that allowed you to choose between multiple banks of channels...and we had a BetaMax machine on top of that TV with a corded remote control...I remember my Dad was proud of that set-up, it cost A LOT of money when it was new....
We had a huge outdoor antenna with a knob to turn it. We got 6 channels on a good day. We also had a Betamax with corded remote, but it was broken. (Or maybe we just thought it was because we only had VHS tapes?)
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!
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!
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.
Your voice is so freaking calming I actually slept in while watching this video and then the blooper came up and it completely scared the crap out of me half asleep xD
Jfc, you really are everywhere, aren't you.
@EpicLPer
write out one hundred times "i must not sleep during lessons" , hehe :-)
such a high-quality and informative video, thanks for putting this out there, I loved it!
After all these years of watching your channel, I went back to find this very video- because your bit that starts at 4:59 is one of my FAVORITE OF ALL TIME TECHNOLOGY CONNECTIONS MOMENTS I love it so!
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.
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
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.
almost cried when i was able to hear the 15KHz at 32 years old (with 17 + years of metal/rock rehearsing at least monthly) XD
Dude, I’m a young teen and I’m immune to that stuff
Whenever possible I adjust the TV to eliminate overscan as much as possible as I value an intact image over hiding the closed caption info. I even do this on flat panels by putting it in to 1:1 pixel mapping mode. My Toshiba calls it Native mode.
Flat panel TVs unfortunately emulate overscan by scaling the image up a few percent and then cropping all 4 sides. So even if you are watching a 1920x1080 image on a 1920x1080 screen it often isn't just displaying it as-is, it scales whatever resolution it gets up to for example say 1952x1098 then crops 16 pixels from each side and 9 each from the top and bottom. The exact numbers don't matter, what matters is that scaling reduces picture quality and cropping of course robs you of some image that is supposed to be there.
yeah i too prefer the "just scan" method instead of having to deal with image crop. I refuse to accept any kind of safezone image crop nowdays. Because that is shit that we have thankfully overcome through technological progress. It's just a problem sometimes when you watch movies and shows with their old Broadcast master that has TV safezone crop in mind and now you see the flaws around the edges of the frame.
My family still has a Samsung plasma TV, and I assume the cropping is to accommodate the burn-in protection, which shifts the image by a few pixels every 10 minutes or so. The "Just Scan" picture size turns the protection off, and for some reason, isn't available when the image is in 720p (but is available on 1080i).
(Personally, seeing all of the image is weird since there's so much unused space along the edges (though it's more the fault of graphic designers trying to accommodate sets that don't have a "Just Scan" option), so I usually just leave the image on regular 16:9 "cropped" mode.)
I watch several old Cathode Ray Dude episodes, and UA-cam decides I would be interested in your older episodes as well. Thank you UA-cam! Very good episode, I always learn from and enjoy your channel; then and now.
I spent my first working years in the 80's repairing consumer electronics, mostly televisions. Excellent job on the video. Very well done.
You put so much work into this, Thank you!
I love your channel so much ! You make me happy at every upload !
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
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.
Over the years I heard and remembered all the key terms. You are filling all the gaps. Thank you.
I recently found this channel and I LOVE IT.
I'm 28 and I can hear that high pitch perfectly even after a lot of damage.
I'm 40 and can hear it just fine.
All I hear is the fella talking and crickets
10:59 Did you become slightly slanted downward to the right for a few seconds?
Ha! I just noticed a slight shift in the video after that sentence.
I'm 32 and could here that nasty sound over my tinitus, don't know if I should feel good about it. LOL. Your videos are absolute genius. Love how clear you explain things, love them. What an amazing job you do!
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.
15:29 Woah man spooked me there real good chumaroo. Thanks Mr. Skeletal.
doot doot
It"s a scene from The Corpse Bride
12:10 “epilepsy warning” it says flashing
2Hz doesn't induce seizures to anyone so it's fine, still made me chuckle.
Watching this for research, very informative and the humor is great. Thanks!
I'm 30 and I still heard the sound at 11:57 VERY clearly. That actually made my day.
This also explains why both my sister and I could 'hear' from upstairs if the basement TV was on even if nothing was playing on it.
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.
i'm 40 and can hear that high pitched noise just fine... AAAARGH
I wish I could say that.... kinda... Not really. (It would be probably be very annoying.)
I remember the noise as a kid being much more of a hiss than a whine. I can still very much hear it in this video, both at 5:41 and 11:57, and boy is it unpleasant. Either my ears have gotten MORE sensitive in the last twenty years, or the TV sets I dealt with back then had better noise dampening/isolation than the ones being demoed. As a matter of fact, we still use CRTs for preview monitors in the AV production world, and I've never heard them make any noise other than the slight "electronic" noise of the tube being charged.
me to but only on headphones, i can just hear the click of the start of the sound and end without. im 40
Best video I've seen about anything! Please be my teacher.
"I'll turn the horizontal deflector". That sounds so Star Wars hahaha, excellent video!!!
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.
Just a few non accurate statements. For example the reason there is an interlace and the HV off the flyback
I think 95% of T.C. suscribers already know how analog TV works, and 100% of those still want to watch the video, knowing your explanation will make for a fantastic video!
As usual, amazing work. I don't think we can thank you enough for making these videos.
What a bro wearing that EPCOT shirt. I salute you sir.
5:41
I actually paused this to see who was watching TV downstairs before remembering we don't own any CRT TVs and realizing it was coming from the video.
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!
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
Back when you would approach your front door and know the TV is on even when it's muted because of the high pitched whine.
I'm almost 27, I can still hear it on the old TVs. It still to this days drives me nuts.
i havent been able to hear such high pitched noises since i was like 16 heheh
i only heard a click
I'm 28 and I heard it faintly in my left ear.
29 (30 in a few months) and it heard it so loud it hurt my ears and head.
I lost the ability when I got into my thirties.
Mechanical television? When I heard that, I instinctively looked at the subscribe button, only to find that I already subbed :(
Stevenson's Steam-powered Moving Pictures Box was completely overshadowed when he invented the train.
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 ❤️
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.
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.
Over 25 (31 as of writing) and I can hear that coil whine. Yay for having good ears. :)
That's a frequency of about 15,700 Hz. I'm 34 and can hear up to 17,500 Hz. It's not that uncommon.
That high pitched sound reminded me, why I hated most CRTs.
On a side note...Do I know you from the WMD forum? Your name and avatar seems familiar.
I am 29 and also can still hear it.
im kinda glad i cant hear it anymore, i remember how annoying the sound was as a kid
raafmaat I wonder if people who have an annoying wife and go deaf would say the same thing? "I'm glad I can't hear her anymore, I remember how annoying the sound was when we first got married" :p
i can only hear it in one ear, my other ear has Tinnitus from years in a factory next to a loud CNC lathe
i just bought a home repair manual from the mid seventies it has a chapter on repairing and recalibrating TVs for novices.
SandyStarchild Does it have a chapter on not dying? Make sure you look into stored charges in large capicitors. He only mentioned the high voltage when the tv is on. But many kids died from playing inside the back of a tv set that had been disused for years just because the power supplies had large capicitors capable of holding s charge for years. Long about the 1980, they started adding bleeder resistors that would allow the caps to drain their charge over time. Also, as the wires get old, hi voltage lines that look perfectly fine can begin to arc. So reaching in while it's turned on can make you the most convenient path to ground.
>But many kids died from playing inside the back of a tv set [citation needed]
For decades people have challenged the people who make such claims to cite even one documented instance of someone being electrocuted by a CRT-based TV/monitor, and as far as I know, no one has done it yet.
@MaximRecoil
i didnt die but i was "bitten" many times messing with crt tvs , the biggest bite was from the anode on a 26" tv , i forgot to discharge it and lifted the rubber flap put my thumb under to release the wire clip , felt like id hit it with a hammer :-(
Impressive work done here. There should be an Award for such accomplishments.
I remember Black and White TV. You did have to adjust the horizontal Hold for the left and right, Just like he did. And the vertical hold really did make the TV picture scroll. I adjusted it all the time as a kid in the 1970' s and 1980's. And moving the rabbit ears Antennas! And that high pitch! I remember that! Great Job explaining how TVs work! It was very understandable! My Vocational Technical High School Electronics teacher was a Color TV technician, and he explained how he got a TV Repairman Job, by writing a technical report on how Color TV's worked! And that was when Color TV's were brand new! He worked in the Electronic Field a Long time and then taught Electronics in Vocational Technical School to his Class of 1984'! His name was Mr. William C. Palmer! He was a great teacher! And you are a great teacher too, Technology Connections!
Heh, 5:41 there's that high pitched whine I remember giving me migraines as a child! So happy modern technologies don't do that.
I remember kicking the tv when 14:33
Did you edit in a hearable sound into your video when talking about the audible noise that people above 25 can't hear? Or did you use the real noise? Cause I'm 33 and I was able to perfectly hear it and it was a pretty annoying sound, so I think i was hearing it very well.
The above 25 is just an average. Some people's hearing doesn't deteriorate as fast, and thus they can hear it.
What time did he place the noise
I've not been able to hear it, but since it is coming via speakers, rather than an actual CRT, it's a combination of factors for me, especially as I can still hear it on the more powerful CRTs even today. A lot of it depends on the power of the audible signal for me, but I've also been dealing with high frequency hearing loss and tinnitus most of my life.
@@jgkitarel Also youtube compresses the files to save space, but that also reduces or even cuts out the higher range frequencies. Also your equipment may not be capable of producing that frequency.
I'm 34 and I've been able to hear that noise my entire life, including during this video. I never listened to loud music and therefore didn't destroy my hearing. Or I'm a mutant, not sure which. And yes! I realize this video is just over three years old, but I've been going through this amazing channel's videos!
im 30 and can definitely still perceive the ringing as you put it into the video. im not sure if i truly hear it so much as /feel/ it in my ears, but it was definitely tangible