The Impossible Feat inside Your VCR technology connections

by noithatSDFGH



Patreon에서 이 채널을 지원할 수 있습니다! 아래 링크 요즘 VCR은 무엇보다 기이한 것 같습니다. 그러나 사실, 모든 VCR 내부에는 해결할 수 없는 것처럼 보였던 문제를 해결하는 장치가 있습니다. 비디오 헤드 드럼은 테이프 속도의 복잡한 문제에 대한 매혹적인 솔루션이므로 기억할 가치가 있다고 생각합니다. 또한 비디오 헤드 드럼은 최신 하드 디스크 드라이브와 일부 모터 기술을 공유합니다. 그래서 거기에 있습니다. 이와 같은 동영상을 더 보려면 구독을 눌러주세요! 이러한 동영상을 원하는 대로 제공하기 위해 최선을 다하고 있습니다. 시청 해주셔서 감사합니다! Patreon을 통해 기술 연결을 지원할 수 있습니다! 여기에서 나를 찾으십시오: Techmoan의 D-VHS 데모 비디오: 이미지 크레딧! VERA — Kinescope — Kinescope 2 — 텔레시네, 회전식 변압기, 슬립 링 픽업 – Wikimedia Commons Quadruplex: — Quadruplex 2 — Quadruplex 헤드 — .

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The Impossible Feat inside Your VCR

The Impossible Feat inside Your VCR

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The Impossible Feat inside Your VCR
technology connections
온라인으로 돈을 버는 모든 최신 방법 보기: 여기에서 더 보기
온라인으로 돈을 버는 모든 최신 방법 보기: 여기에서 더 보기

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45 comments

MrJef06 16/10/2021 - 2:22 AM

10:27 rotary transformers: smart! I thought rotary contacts were used.

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Alex Ward 16/10/2021 - 2:22 AM

This is one of my favourites from Alec. If you’d like to learn a little more about recording video to tape, you might like this gem I found earlier. In typical British 80s style it’s a bit tongue in cheek in parts, but it brilliantly demonstrates the principles in a slightly more hands on way.
https://youtu.be/g1JlUcFKm5o

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Chris Lemaster 16/10/2021 - 2:22 AM

I heard also that the Porn industry as Beta could only record up to 1.5 to 2 hours where as VHS was cheaper and they could get 6 hours of porn on one tape. That is one that I have heard is that the Porn industry killed Beta Max and the recorder was also very ex;pensive costing 250-300 more than VHS back in 1985.

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baller 16/10/2021 - 2:22 AM

That fuzzy sound needed tracking lol

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baller 16/10/2021 - 2:22 AM

I miss buying a new vcr every two years

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baller 16/10/2021 - 2:22 AM

You look like Otho from Beetlejuice lol

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Reanetse Moleleki 16/10/2021 - 2:22 AM

I finally know what the holes in cassette tapes are there for. I can die now.

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fdwyerSDMM 16/10/2021 - 2:22 AM

The link to the DVHS is amazing… it looks fake

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David Devereaux-Weber 16/10/2021 - 2:22 AM

Nice video.

I worked at a TV station in 1977. We had 3 Ampex 2 inch quadraplex videotape machines. Television stations lock the synchronization of all their sources so the picture doesn't roll when video is switched. Synchronization on the Ampex reel-to-reel machines was analog – so it took 7 1/2 seconds to synchronize the playback to station sync. As a result, videotapes had color bars at the beginning of the tape, and usually also had a countdown at the head of the tape.

There was a cue channel on the tape, and that was used to record a tone on the tape to be able to find the beginning of the program. That allowed the videotape operator to find the beginning of the program. A 7 1/2 second tone was recorded, so the tape operator could quickly find the cue point.

A Quad machine had 4 heads, and playback had 4 video amplifiers. Part of the process of setting up tape playback was to play color bars and set the controls for each of the 4 heads for similar gain, to prevent "banding" in the video.

Commercials (spots) were recorded individually on small reels. A 2 minute commercial break had four thirty second spots. With 3 videotape machines, 1 machine was reserved for news segment playback, and 2 machines for commercials. In preparation for a commercial break, the operator pre-loaded 1 commercial on each of 2 machines. Mount reel; thread tape; set video gains; fast forward to cue tone, and stop. The first machine was started 7 1/2 seconds before the commercial, then the video was "taken" on the video switcher. 22 1/2 seconds into the first spot, the second player was started. As soon as the first spot ended, the operator then had 22 1/2 seconds to rewind the tape on the first machine, take it off, mount the tape for the third spot, set the video gains, and cue it. Then the same for the fourth spot.

The news video tape was usually a 12 inch diameter 2 inch wide tape. They were heavy. Often there were multiple segments on the tape, so each segment had to be found by fast-forwarding the tape while listening for the cue tone beeps, then set up for the 7 1/2 second pre-roll. Often the newscast used recorded segments out of linear order, for example the 3rd segment, the seventh segment, the first segment, and the twelfth segment. Fast forward and rewind had powerful motors that spun very fast, so stopping took a few seconds. The news director had to plan the tape segments carefully to give the tape operator time to find and set up each videotape segment. The worst case situation was a videotape news segment, back to the news anchors for the handoff, then a 2 minute commercial break, during which the videotape operator is real busy, then back to the anchors, then another videotape news segment.

After a 30 minute newscast, the tape operator was wound as tight as a spring.

After I left that station, around 1980, Ampex came out with 2 inch quad cartridge video recorders. There was a large cartridge storage section. The machine automatically selected the cartridge and loaded it. Synchronization was digital, and only took .002 seconds to lock-up to station sync. You could program an entire newscast in advance, and the machine would play all of the tapes in sequence. They were amazing!

One of the problems the video carts caused was if the technical director pressed start on the cart machine and "took" the video at the same time, there was a .002 second period of no video going into the transmitter. Video transmitters were analog at that time, and analog video was inverted, so no signal to the transmitter put it at 100% power for .002 seconds, which caused an alarm on the transmitter and an error message on the automatic log. So we had to train the technical directors to have a slight delay between pressing start and "taking" the video. We later built that into a digital timer to prevent the issue.

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Preston Stone 16/10/2021 - 2:22 AM

You should make a video about vcr+ , the dvdvcr

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S o u p 16/10/2021 - 2:22 AM

You could've kept the video at VHS quality but nOoOoO you just HAD to jumpscare us with 1080p

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Matthew S 16/10/2021 - 2:22 AM

The Quasar VHS SP only Camcorder from 1988 that I had growing up had much better picture than any newer VCR I purchased….It had a box so it could double up as a VCR. Never even had a belt break in the 30 years we had it. I wish I never donated it to Salvation Army.

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boredwithusernames 16/10/2021 - 2:22 AM

Now who remembers "Near Instantaneous Companded Audio Multiplex"… that is NICAM to the layman 😉 A true breakthrough back in the day 🙂

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Magdalena Živković 16/10/2021 - 2:22 AM

im amazed at the consistent high quality of your videos. they're interesting, informative and enjoyable.

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Meof Myof 16/10/2021 - 2:22 AM

Toshiba was about to release an 8 head digital vcr when dvd came out. They pulled it before it hit stores.

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T W 16/10/2021 - 2:22 AM

Why are you dressed as Leonard Nimoy in this one? ; )

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Scudmaster11 16/10/2021 - 2:22 AM

I axualy never hated tape formats… VHS was my childhood "from 2004"

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BrooklynWalker 16/10/2021 - 2:22 AM

This made me go look at old photos of myself, particularly my old hairstyles.

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Time Surfer 16/10/2021 - 2:22 AM

FOM, Electronics Engineer, was using a VHS unit as a Tape Storage Drive for his Trash 80, some time back. Stupid capacity, and with timestops, well…

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JDM12983 16/10/2021 - 2:22 AM

I thought I heard it right, "let's look at the parts without a cassette in place". Proceeds to show withe cassette in place. 😛

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luke murphy 16/10/2021 - 2:22 AM

Flash back to less then 15 years ago to casie neistat still recording stuff on vhs because “dvd format is bad and will never catch on”

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Michael Marry 16/10/2021 - 2:22 AM

We had a player in school the servo unit was worn out and needed to be moved by hand.

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Chris Bedford 16/10/2021 - 2:22 AM

That hairstyle though.

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sedwarg 16/10/2021 - 2:22 AM

6:26 I immediately realise why the beginnings of my childhood VHSs were always so distorted.

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Someone Else 16/10/2021 - 2:22 AM

12:00 Damn that brought me right back to my childhood. My dad's side of the family used the higher quality ones, while i remember my mom's side of family having stuff recorded on what looked like the SLP. Especially the blurring bottom brought the memories back, as well as the sound.

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pev 16/10/2021 - 2:22 AM

I am a tech minded person, and I always find that it is the mechanical side of things that leaves me open-mouthed! Like here, how can the tape just "flow" around the drum, I do understand that it forms some kind of air-cushion between the tape and the fast-moving drum, but how that is reliable I just cannot fathom. That also means that you cannot use a VCR in vacuum (in space). Awesome tech in any case! And I did have VCRs in the 80's and 90's. My second one was just awesome, a Mitsubishi E52, Hi-fi Nicam, it had unbelievably good features starting with a learning universal remote, or a "next" function where you could tell it what to do after the present function ended (e.g. after rewinding, power off). I still have it but unfortunately some of the rubber belts and parts need replacement. So I did get a "cheapest" VCR some years ago so that I could at least watch some of my collection of more than a hundred VHS tapes when desired.

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Tony Stanley 16/10/2021 - 2:22 AM

A nice reminder, I spend 14 yrs as an Engineer and Manager in VCR factory, suppling the EU.
To add a little more detail, the capstan and head drum are not so precise as they are servo locked (with a variable tracking signal controlled manually or later with automated optimisation). The capstan is a servo/stepper motor that is locked to the tracking signal, and the head rotation is phase and speed controlled to the tracking signal too.
Other features we had in the UK where PDC or Program Delivery Control, the broadcaster would transmit a signal that indicated the programs intended start time, this could then be used to ensure late or early broadcasts where fully recorded. Unfortunately mistakes by broadcasters and manufacturers made this temperamental. I spend quite a few years at clock change over times chasing up broadcasters who have not changed their time signals and we were getting thousands of complains about "no record". When the equipment doesn't record your favourite show, you are not going to be happy. This resulted in the system being defaulted to off in future production. Germany had a VPS system, we never got any complaints about it.
Then there was NICAM, basically broadcast digital stereo audio for analogue TV, not so much a VCR specific thing, but went very nicely with HiFi Audio, and was an additional UK feature. Germany has stereo analogue audio.
We also had Videoplus+ a way of programming the record time. A straight number was published in the program guide (paper magazine) and you entered that to set the recording. Being simple it worked quite well and became a standard.
Some other VHS standards (apart from VHS PAL and VHS NTSC) where VHS SECAM (France) and VHS MESECAM (middle east Secam). The MESECAM was a cheap version that basically used Pal circuitry with some slight mods to make it work, the VHS Secam was a highly different and unique VHS system used with Secam L broadcast (France), the quality was quite good colour but we always had alot of trouble with it on some of the test signals.
Towards the end we got into digital TV and made Settopboxes and even a VCR with digital receiver. The EPG (Mandatory in the EU) from the digital TV was the best way to program the VCR. It worked well but HDD recorders were much better, and actually simpler and recorded the broadcast signal perfectly without any loses. While alot of the early PVRs were poorly made, noisey fans and tended to fail from overheating, they were easy to design and make and didn't need the specialist technology of VCRs so there was alot of competition from China. We did made some good product in the UK, but retailers and brands took the lower quality stuff from China. The factory was closed before 2010, although I had already been made redundant in 2003.

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Enigmatic Loremaster 16/10/2021 - 2:22 AM

The other problem with VCR's was the tape rust, over time if not stored in a very dry place the tapes would get this green looking mold on them that is actually corrosion, soon as one of these tapes is played it instantly clogs the heads and it takes forever to clean it off. They should be run through a video tape cleaner a few times before you play them, but all this equipment is getting so rare now you would be lucky to find a video tape cleaner anymore.

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Mike Mahoney 16/10/2021 - 2:22 AM

Analog video and audio is both fun and interesting …especially in todays “sterile” digital age. As a kid from the “Age of Analog”, I remember the first VHS machines …exactly like the “old beast” you pulled out in this video. Not only heavy in weight but also in cost, just like any new consumer tech; some things don’t change. I had to laugh about using the humble VCR as an audio recorder; another trip down memory lane. Whereas the reel to reel was the champion as far as recording audio with it’s 7 1/2 IPS (inches per second) top speed (pro models topped out at 15 IPS) …the humble, unpretentious, 4-head VHS recorder could best most R to R decks without even breathing hard …even at its slowest recording speed. It was probably the pinnacle of analog audio tape at the digital threshold.

As I am in the midst of digitizing my collection of VHS tapes, your videos on doing the transfer have been helpful …and ingenious. This “deep dive” into the “magic” VCR was interesting and fun. S-VHS, if I remember correctly, could only take advantage of the increased resolution if the tape being played was recorded in S-VHS format. Commercially produced tapes were not done in the S-VHS format (the better to sate mass appeal) so there is no advantage in resolution with commercial tapes played on an S-VHS machine. The only advantage of S-VHS was the introduction of S-video which gave an inkling better picture than the composite signal.

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Matt Sullivan 16/10/2021 - 2:22 AM

This guy should be an actor I picture him in like a Penguin Batman role, or maybe he can play Pritzker when we make a movie about what a garbage governor he was lol

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Preston Chacon 16/10/2021 - 2:22 AM

Excellent video, very creative, well done!!

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Charles M. Hannum 16/10/2021 - 2:22 AM

16:18 Of course it's possible, how do you think CDs were made? "September 1977: Sony introduces the PCM-1 Audio Unit ($4400 street price)[28] (44.056 kHz, 14-bit), the first consumer (well-heeled) PCM encoder. It required the use of a home video tape recorder for storage." Before DAT, a lot of audio was recorded digitally on video tapes. And boy did it make CD mastering wonky and inconsistent.

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fred flintstoner 16/10/2021 - 2:22 AM

Mrs Richards: " I paid for a room with a view!"
Basil: (pointing to the lovely view) "That is Torquay, Madam."
Mrs Richards: "It's not good enough!"
Basil: "May I ask what you were expecting to see out of a Torquay hotel bedroom window? Sydney Opera House, perhaps? the Hanging Gardens of Babylon? Herds of wildebeest sweeping majestically past?…"
Mrs Richards: "Don't be silly! I expect to be able to see the sea!"
Basil: "You can see the sea, it's over there between the land and the sky."
Mrs Richards: "I'm not satisfied. But I shall stay. But I expect a reduction."
Basil: "Why?! Because Krakatoa's not erupting at the moment ?

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Tyler Fu 16/10/2021 - 2:22 AM

I'm still watching this video on my computer with a magnetic harddrive… how they are able to put so much information on magnetic hard drives these days boggles the mind. Maybe you should do some videos on magnetic data storage on computers… as I grew up with 1.44MB floppy disks, and hard drives had about 700 or so MB on it at the time (1995). Now there are 5 TB hard drives, still using magnetic storage. I wonder how they did that?

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Lil Yolk 16/10/2021 - 2:22 AM

What is your email?

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Raid 16/10/2021 - 2:22 AM

Interestingly enough I noticed recently that comparing a movie on Netflix with the same vhs tape on my 4 head hi fi vcr (which I believe is about 25 years old, roughly my age) the audio was almost identical. And the video quality of the tape was actually still quite excellent really, just the color saturation was a bit wonky. But hey I love watching my old tapes on the same vcr I had growing up.

Makes me feel warm and at home.

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SupertzarMetal 16/10/2021 - 2:22 AM

Navajo and Hopi Indians got one-day dry cleaning service! 2:10

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ValmisFilm 16/10/2021 - 2:22 AM

Wow…. and that´s why we need engineers to figure all this stuff out…

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Pete Nielsen 16/10/2021 - 2:22 AM

It is 4 years later now and it looks like you have less hairline too!

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Richard Baumgart 16/10/2021 - 2:22 AM

Damn i would've put my vinyl on hi-fi VHS tape back in '85 if i knew it was almost cd quality instead of cassettes like i did..would just have to hook the vcr output to the stereo amp

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FuchsDanin 16/10/2021 - 2:22 AM

Man. I grew up working in a family shop (we were one of the honest few) which serviced all of the same equipment I keep seeing on your channel. I have easily 25 years of active, constant experience working on consumer electronics from the 60s thru 00's — it was my actual job, and I thrived under it. I'd love the opportunity to work with you any time you need anything I can offer — and I'd do it free, for love of the game. Please reach out if you ever happen to see this.

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bwhog 16/10/2021 - 2:22 AM

For broadcast, Umatic 3/4" wide tape running at twice the speed of a standard VHS tape deck was the standard (especially at local outlets) but 1" reel to reel was also an option, which gave better quality. The Umatic cartridges I worked with typically only held about 70-75 minutes worth of tape and for use for commercials, promos, and PSAs, only 3.5 minutes was spooled. After all, just how much do you need for a 30 second commercial?

I used to sit there at the shop at the TV station in the 1980s mesmerized by what was going on inside that tape player. These machines used a "C" sort of threading for playback ("M" for FFW and REW) so it was even more interesting watching it spool out of the tape cartridge. It wasn't until many years later that I understood just how clever the video tape recorder really was, that there was a very specific reason the drum the heads were mounted on an angle to the tape. I never knew about the transformers though, nor did I know about the azimuth on the tape heads. That's pretty dog gone neat! The engineering that went into these machines really was off the charts clever!

It's not just that we're used to higher resolution that makes VHS/etc appear so bad. It's the fact that it's still magnetic media and magnetic media degrades over time (the magnetic signal fades, higher frequencies going first, and being stored at warm temperatures, such as a warehouse in Southern California, accelerates this process). So some of the stuff you see from Back In The Day was actually better the first time around but waited for quite a while before undergoing the digital conversion to preserve it and thus isn't as good as we want it to be. The reason things like "I Love Lucy" and "The Dick Van Dyke Show" look so good is that they were filmed (actually filmed) not merely recorded to tape as things would be in the '70s and '80s and thus didn't suffer that type of degradation.

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Justa Youtuber 16/10/2021 - 2:22 AM

1:31 "7 and a half inches per second." Sounds like my ex-GF at spring break

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Sujit Warrier 16/10/2021 - 2:22 AM

I can tell what year this video was released just by looking at the hairstyle.

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Katie Donovan 16/10/2021 - 2:22 AM

12:00 Lulz.
I actually used to record things off of broadcast television.
First, this was back in the time before digital broadcasting, so most of the time you would be receiving an analog signal over the air. Analog signals differ from digital in several ways, but the most major way visible to the end user is in picture quality; with old analog signals, you could actually miss seeing or hearing some of your program.
But with digital, you either see it, or you don't. There is no, "It'll kinda come in."
But, assuming your reception was clear enough, the appearance of faces and detail on old color televisions was every bit as good then as it is today.
In fact, an argument could be made that television actually looked way better back in the day…about 1995 or so.
See, we didn't have flat screens, then.
Why does that matter? Chrominance, luminance, and color gamut.
CRTs worked by illuminating phosphor dots with an electron gun.
Color CRTs used three different color dots lit up by three different beams, one for each color. Though, it is important to note, the beams themselves all appeared to be the same color, and different colors were achieved by illuminating different colored dots on the screen with varying levels of brightness.
Why was that important? Because it allowed the color CRT to reproduce colors across the full range of human vision.
And no, LCDs do not….and in fact they cannot…ever.
No matter how good an LCD gets, it will never be physically capable of reproducing ALL of the colors we can see, and in fact can only reproduce a tiny fraction of the full range of visible light.
This is most noticeable for reproductions of green.
If you look at a good quality film-developed photograph (in other words, not a digital photo)of a lush forest on a CRT and then look at that same photograph on an LCD, you will notice a MARKED lessening of green on the LCD.
There is nothing that can be done about this for this technology because the way an LCD monitor works is by backlighting the dots which CHANGE colors, rather than selectively adjusting luminance, chrominance, and color by illuminating unchanging dots through a shadow mask.
A shadow mask is a part of every CRT. It's made out of metal and has a series of tiny holes poked into it so the electron beams can only illuminate the exact dot they are aiming at and no other. In this way, it was possible to have very great differences between the chrominance and luminosity of one dot on the screen vs. the one right next to it.
This in turn allowed for high-fidelity color reproduction, with the values produced by the CRT being MUCH closer to real life than any other method of color reproduction in moving pictures.
And the sound wasn't this bad, either.
No one would have bought tapes if they sucked this badly.

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