Your Shure M44-7 is a variable reluctance design. There are 4 permanent magnet pole pieces, that form a magnetic circuit, which the stylus cantilever completes. So it is not a moving magnet design. Without any stylus, the magnetic circuit is "open", so picks up a nearby magnetic field, and the amplification is enormous. The rotor part of the turntable has multiple north/south zones, and is a direct drive stepping motor. Try circling a steel screwdriver near the rotor, to feel the effect! Have fun!
Just see this and i think your spot on here , the magnetic fields cross paths and amplify and yes its direct drive quartz stepping motor has multiple north and souths
This......the cartridge is essentially picking up a really bad square wave with rounded corners. But i think because of the position of the coils in the cartridge the left and right channels might be slightly out of phase. it would be interesting to see how just a single channel sounds compared to 2 channels from the cartridge.
It's a moving magnet cartridge, so the magnetic ring on the platter will be inducing movement in the magnet in the cart. That's some serious thinking outside of the box! I'd have never thought of trying that.
@@DJBlakeyUk I'm going this path also. If you have a friend working in electricity, this person should be able to safely reproduce this phenomenon on a bigger scale so you can "visualize" it.
No need to move anything in the cart. The magnets of the paltter are simply generating alternate currents on the cables. Those direct motors have multiple magnets in oposite polarizations. That generates square-ish electric waves, which produce a very rich sound full of resonant frequencies. As all the magnets are pretty close, all of them interfere each other producing an even richer sound. It's a really interesting casuality
The way the drive system for the turntable is set up, means that the magnet on the platter has lots of separate magnets side by side in a circle. This means that you have alternating magnetic poles as the platter spins. There is a corresponding set on the drive system underneath which push/pull the platter around when both are the right way up. With no stylus attached, the spinning magnets induce an alternating current in the cables remaining in the arm, in this case that produces sound at an audible frequency (dependant on platter speed). This is similar to the way a guitar pickup works, where piece of metal vibrates above a magnet that is surrounded by a coil of electrical wire. The exact tone of the note will be determined by the way the magnets interact with the cables and each other, plus potentially getting distortion from driving the inputs on the mixer. The wobble will just come from the platter being slightly uneven/wobbling itself.
I can't believe it. I have the dvd from back in the day and never forgot your set. Was only thinking about it the day and wondering what your up to. Glad to see your well.
Man, I lost my f**king mind seeing you perform this at both of these finals! Such a shame it didn't quite carry over for that world final ✊🏼 solid set to this day
Thank you. It’s an interesting one because I was aware of how good Rafik and I.emerge were, and I knew that I was never going to win the world final. I also didn’t do great in the eliminations which is why I went on 2nd. By the time the final happened I just wanted to get through it by performing my set cleanly. I did that and therefor was satisfied. But I was only ever going to get 3rd place at best. In the end I got 4th, which I’m proud of.
The cartridge is just a mechanism for transforming analog movement on a record into electrical signals which get passed to the amplifier. When you remove the cartridge, the wiring that those signals would travel along are still in the tonearm. Placing the tonearm within the rotating field of the magnet on the platter will generate induction in that wiring, which will then be passed to the amplifier as sound.
This was one of the Best DMC winning set EVER ! You was and are an inspiration from there to now. Please stay healthy and happy. Greetz from Austria to UK !!! PEACE !
this is a clear explanation of what truly made the early days of turntablism so interesting: limitations. Now with digital (which I love) "everything" is possible, so its harder for artists to actually think outside the box.
It's called Induction. It's exactly how a generator works. Passing a magnet over a wire (inside the headshell) makes a power current flow in that direction.
Easy answer.... magic. This is a dope trick you figured out. To use the turntable in a way that's not what technics intended, and making people bang their heads. It's the same outta the box thinking that got people scratching rekordz. As most people are saying, it's the magnet picking up the field from the magnetic platter. Cartridges act kinda like guitar pickups. Headphones, speakers, microphones, turntables, guitars.. all use magnets and can get funky when they get around other magnets. Dude.. I've read the yamaha sound reinforcement handbook cover to cover. I know how to build or repair a speaker. I've built my own speaker cabs. I know the "how's" but the "why's" are a complete mystery to me. How you take a magnet, a voice coil, and a cone made of paper, and it just works, accurately produces sound from an audio source? Don't get me started on vinyl. It's alchemy. Audio and music are the closest things to real life magic. As an audio nerd, this made my day! Thank you for sharing this! 🙏
"Lorentz force" if you want to learn about the physical how/why and not just the acoustic reasoning. In layman's terms, magnets and electricity are related. Batteries have plus and minus, magnets have north and sound. If you run electricity through a wire, you create a magnetic field (electro magnet). And vice versa (a dynamo on your bicycle. Your wheel turning spins a magnet which causes electricity to flow in a wire..thus you got light). In more macro terms: movement and wind. Try walking in a straight line with heavy side wind. And in turn, when you walk quickly, you create "wind" that can move small objects. Now you know why the magnet moves. Why the moving magnet makes a sound, you already know
@@borstenpinsel eeyyyy yo! thank you for the detailed response 🙏 i've never heard of lorantz effect, but im about to fall face first down a google rabbit hole about it. 😅 im a dumb musician, but i really do want to understand how this stuff werks on a fundamental level. Thanks again for enlightening me to a previously unknown path to understanding
Just guessing, since it is a spinning magnet fixed magnet, it is causing an inductive current, which is being picked up by the cables/prongs that usually attach yo the cartridge with the needle. This needle usually moves around in the grooves, and causes an inductive current (because magnets inside). And thus you’ve actually created a big ass pickup, that creates a low frequency audible as a bass. But that’s just my highschool physics classes talking to me. With all this magnetic induction and power generator stuff.
Got an idea for you…..leave the platter on normally, but take the platter off the other turntable and place it on it upside down so you can still use the magnet. This will not only give you great stability, but also allow you to use the power and the pitch.
@@DJBlakeyUk I just tried it on my 12’s and 44-7 and while it does work, using the turntable’s power barely gives any sound - it spins too slow - it needs the high RPMs like you originally had. The tonearm height adjustment has to be at the highest as well for clearance. At least this way it’s more stable. Cool experiment tho!
The stylus uses a coil in the cartridge and a magnet on the end of the stylus (inside the cartridge) to convert the bumps in the groove on a record into an electrical signal which can be amplified. The magnet in the platter is inducing a electrical current in the coil in the cartridge.
❤❤❤ I was there the night you done this trick at the Hammersmith Apollo I think…. You signed my copy of cut master swift breaks that I bought at the event! I remember we went home the wrong way round the M25 and went to my mates house and played on his decks till the early hours trying to recreate what you had done! Thanks for being such an inspiration for a generation of DJs
@@DJBlakeyUk It funny because i phoned my friend - who's house we went to.. He had stanton carts and we couldn't work it out. i think we tried it without the needle because he was scared it would break the tip. He remembers that night, though... i wish i could post the photo of my signed Cutmaster swift - battle breaks volume 4
That's just the electromagnetic inside the cart reacting to the change in magnetic field from the platter "EMI" or electromagntic induction follow the exact same principle that youre showing here The magnet has a magnetic feild When the cart (electromagnetic coil) passes through the magnets feilds it generates AC signals which are amplified to an audible level
Does the magnet change polarity though? Seems the field of circular magnet wouldn't vary much.. do you know the coil I'm m447 is powered AC or rectified?
I understand why this is happening, but not going to waste space when other's have done a good job of explaining it. But damn, I have to say that's some serendipity right there! Nice find!
Use some magnetic field viewing film on the platter magnet. It should show you the location of the magnet poles, which induce the oscillating fields in the cartridge windings. Amplify those oscillations and you get your wobbly bass line!
A cool little fact about the Shure M44-7… It’s is the same cartridge the DJ uses on the turntables she uses in the movie the Warriors. You can see the name of the cartridge on the first song dedicated to the Warriors by the Gramercy Riffs when she plays the song Nowhere to Run. Also another fact is that DJ was played by Lynne Thigpen… the same actress who played Carmen San Diego in the TV show from the 90’s
The magnet ring itself isn't just one magnet. It's effectively a collection of magnets with alternating poles. The turntable motor then drives the platter by alternating the coils below it to drag the magnets along at a controlled rate. Now, when you put the cartridge next to it, the moving alternating magnetic fields induce a signal in the cartridge directly.
Turns out you have just amplifed the magnetic resonance between the turntable magnet, and the small coils and parts inside the head shell. If you take a magnet and drag it over a copper coil connected to an Oscilloscope, you will see a waveform being created. Only in your case, you sent the waveform through a mixing desk and amplifier. Such a cool sound and cool move to be honest
So DJ cartridges are what's called "moving magnet" cartridges (as opposed to 'moving coil') which means the stylus is attached to a tiny magnet that moves inside a tiny coil that is fixed inside the main body of the cartridge. The magnet moving inside the coil as the stylus tracks the groove is what causes the electrical signal to be generated in the coil and sent to the amp to be turned into sound. Without the stylus the cartridge still has the coil and so as the powerful magnets in the platter spin they induce electrical signals in the coil which we then hear as that super-cool bassey noise
@djneils100 A third type is moving iron. So the coils in the cartridge are wound onto permanent magnets, which come together. So focusing the magnetic field onto the cantilever, with a diamond stylus fixed to one end. A Shure V15 phono cartridge is this design. If you remove the stulus assembly and try attract a tiny piece iron to it, you can see the cantilever is not magnetised.
What your hearing is the iron crystals moving in the cartridge magnets in reaction to the larger magnet, the crystalline structure is moving in relation to the magnetic field of the larger magnet being pulled and repelled making the iron crystals in the cartridge head oscillate, this in turn sends the signal to the speakers giving the oscillating bass tone.
it's basically a mechanical oscillator the magnets in the platter have a magnetic field and are interacting with the open circuit as you removed the stylus in the cartridge.
A conductor, a magnet, and motion are the three things needed to make electricity. The spinning magnet on the plater is inducing a magnetic field into the conductive coils of the cartridge, thus producing a voltage that is played back through your mixer/speakers as sound.
This is a beautiful application of magnetic induction; My collegue is currently trying to design an antenna to drive magnetic dipole transitions in a solid state samples; I sent him this as an inspiration. One would think that coils are required to pick up an electric signal, but in reality anything can pick it up, the coil just amplifies it. In this case the magnet is so strong that it doesn't neet that. What you hear is the real-time spinning of the magnet plus overtones and some modulation form the wobbling of the arm and the plate.
A sort of Hall effect, similar to those used in automotive for the cam and crank position (and other) sensors. would be my guess. The gaps in the magnets causes the magnetic field to fluctuate and picked up by the control arm as a sine wave, converted into sound waves with varying modulation dependent on the speed of the of the platter as it rotates... A guess, but I'm not a mechanic, electrical engineer, or musician...Still a nice effect though!
That giant magnet on the platter is ALWAYS interacting with the needle, it’s one reason why belt drives are better for sound quality but of course they suck for djing tho some djs have used thoren belt driven tables (namely larry levan)
Blakey! do you know how many damn times I've watched your 2004 performance???? COUNTLESS! one of the sickest! In my opinion, that's my favorite year of DMC
My question would be: why does it normally *not* pick up this sound? I think there has gone quite some engineering in keeping these magnetic fields out of the pick up element in normal operation. Always amazing how much thought went in these devices that "just work".
I believe the magnet in the middle is not a simple minus inside and plus outside thing, but alternating +-+-+-+-+-..... inside and outside. This would explain the squarewave sount in your wobble. The magnet then does what your stylus does inside the cartridge but way slower, explaining the deep sound. If you would put magnetpaper to vizualize the magnetic field on the magnet, you would literally see your sound signal going to the cartridge, like transients on a daw. Now you could spinn the platter faster to get a higher sound and slower to get deeper pitched sounds.
It utilizes electro magnetism a magnet passing a wire or multiple causes and induced current in the wire giving a signal to your system. And it being such a low frequency it sounds to the human ear like bass
The spinning magnet on the back side of the platter is creating a small (but varying) electrical current current by electromagnetic induction. The rate of spin influences the 'tone', a quick sample reveals the fundamental starts at 60 hz and drops to about 40 hz as the rotation of the turntable slows. From Stanford Magents: `Magnets generate electricity through a process called electromagnetic induction. Here's how it works: Relative Motion: To generate electricity, there must be relative motion between a magnet and a conductor (usually a coil of wire). This can be achieved in various ways, such as moving a magnet through a coil of wire or rotating a coil within a magnetic field. Magnetic Field Interaction: As the magnet moves, the magnetic field around it changes relative to the conductor. This change in the magnetic field causes the magnetic flux through the coil to vary. Induced Voltage (EMF): According to Faraday's Law, this change in magnetic flux induces a voltage in the conductor. The faster the change in the magnetic field (i.e., the faster the relative motion between the magnet and the conductor), the greater the induced voltage. Electric Current: If the conductor is part of a closed circuit, the induced voltage drives an electric current through the circuit, generating electricity.`
@@DJBlakeyUk legend! i gotta give this a go actually blew my mind these discoveries always tends to be a "one night at home" situation with a few beers
Cool sonic discovery! When viewed through magnetic field paper the polarization of the technics ring magnet alternates radially dozens of times, another experiment would be running a cassette tape head over the magnet to hear if the effect is replicated that way.
You can hear it, its the irregularities on the surface of the magnet edge. I bet if you sanded and polished the edge of the magnet surface the needle is laying on than the sound would be a lot more muffled sounding instead of the sharp bouncy tones in the sound.. like comparing a kick drum with and without padding stuffed inside.. minus the ringout..
@@Z-Ack Interesting take. The guy who services these decks is already unhappy with me for doing this. Not sure what he’d think if I started sanding the magnet 😅
I’m an Electrical Engineer and no musician so I’m not familiar with a turntable (especially never having had one). However I can tell you in simple terms what’s happening. Magnets and electricity share a direct relationship, any electricity run through a wire creates a magnetic field, and a magnetic field creates an electric charge. Two simple examples are a wire winding that becomes a very powerful magnetic (like the ones they use to lift cars for a crusher, or a speaker cone) and a collapsing magnetic field creates electricity (wireless charging, or that “thump” you would hear with older amps when you turned them off (diodes are typically used to prevent this now). Similarly you might hear a buzzing in your headphones if you are close to a power cord. As the magnets in the “cassette” I believe you called it change poles (North to South) while spinning, the generating and collapsing magnetic fields are picked up in the wire (in the tip of the “arm”) created an equally oscillating voltage in the wires. (This is the very basics of wireless charging). I would imagine that if you flipped the cassette upside down (without spinning it) and simply waved the arm back and forth over the magnets you a similar effect.
The cartridge contains a magnetic pickup (not unlike those found on a guitar) made to pick up electric currents and convert them to an audio signal. Whenever you move a magnet you create an electric current, which is then picked up by the magnet inside the cartridge. It's that simple!
YOOOOOOOOOOOOOOOO 2007 I Started & All those sets with the Tricks, Scartch Perverts, PLUSONE, Dopey is what i was trying emulate(ITS COOOL) and of course that Cartridge is the only this that could survive such ABUSE. BUT MY. MAN you flipping the PLATTER over Flipping the TRICKS on its HEAD, even more so than PrimeCuts, your trick too me without the stylus. its the ONE MAN
All the stylus does is move small magnets up and down and side to side in the cartridge. The cartridge works a bit like a microphone so two coils picks up the movement of the magnets sending an ac signal to the pre-amp. By spinning the platter you’ll have and alternating magnetic field coming from the ring magnet and the magnets inside the cartridge will be vibrating all over the place
Holy shit I had that years finals on DVD. Watched that so many times. I remember Daredevil i think it was always doing that finger thing between beat juggling. Was such a good finals and you win was fully deserved!!
I find it amazing that this was discovered by accident. It’s defiantly caused by the magnets moving past the coils in the cart if it mm or mc I don’t know but it makes no difference it only needs motion between any magnet and the coil in the cart moving or fixed. It wouldn’t work with a ceramic pickup.
Its been a while since i saw that 2004 dmc video . Musicians do wonders when you are not using too much theory but experiments and hands on practical :)
As the stylus interaction with the cartridge is an electromagnetic pickup of vibration realyed from the grove of the record the magnet on the bottom of the platter is interacting with the pickup within the cartridge and that is where the noise comes from. Hope that makes sense.
That’s dope as hell! Watching your set 🔊 The duh explanation is the magnetic field is interacting with the cartridge which uses electromagnetism (like guitar pickups, microphones…) The specifics.. 🤷♂️
It’s certainly interesting to see if someone can answer your question at the beginning of the video about why the turntable is making that sound. But what’s equally interesting to know is how one even comes up with the idea of flipping the turntable and being so motivated to take the extra steps until this absolutely cool sound comes out. This kind of thing surely doesn’t happen when you’re sober. 😉😂 But seriously, great idea, respect! 😀👍
@@DJBlakeyUk Awesome answer Bro 😅😅 - that was a different time in the 2000s, but again big respect for developing such a trick even after "one beer or two" 😉😅 - Love your channel, all the best 👍🔥
reminds me of the scene from The Hunt For Red October, where Jonesy the sonar operator takes the recording of the "seismic anomaly" and speeds it up 10x "That's gotta be man-made"
That is the sound of inductance. You have a magnetic cartridge that is being inducted by a far larger magnet. 🧲. The magnet(s) on the head is simply a voice coil. . Love your work.
To this day that stills blows me away seeing it. I was like this dude is a madman and I loved it. Thank you for sharing this. Only thing I could think of is that it’s still picking up resonance from the cable pickups from the cartridge but I’m just guessing
Giving a different perspective, guitar pickups produce sound by vibrating metal near magnets. That's essentially the mechanics going on here to make a sound that is electronically picked up--just moving the magnet near wires instead a guitar string over a pickup.
A friend of mine was spinning some acetates of his own records that he'd had cut that week for a set, someone came along and did the most aggressive rewind ever and something happened to the stylus which produced a similar effect for the rest of the set, just an extra, constant 40hz rumble under everything 😂
1:19 reminds me of a time I just caught the end of when I was hitting the clubs. All those turntables. Nowadays, it seems like you just get two (or none). Where can I find music that's mixed multiple songs together, not just two, at a time (for the most part)?
The disc is a magnet with multiple poles. Lots of N S N S poles, so the electromagnets in the machine can turn it. your magnetic pickup coils in the cartridge are picking up the motor magnets as it spins.
Your impression is most likely correct. This operates basically the exact same way an electric guitar pickup works. When you spin the magnet, you create a modulating magnetic field, which is being passively picked up by the leads in your cartridge. People have made similar sounds using fidget spinners and guitar pickups.
Isnt the direct drive part sending to energywaves to the magnet? Try that without the powersource, maybe. Or push on 'start' when power is on and check with the 33/45 setting if the sound if changes. That will tell you a lot.
spinning magnetic field inducing voltage on the wires running from the cartridge, you've made a generator. mV signal from the stylus is super amplified and it is also amplifying your generator mV. does speed change the pitch?
@@davesnothere8859 Yes moving the platter faster changes the pitch. It needs to spin very fast though to make a good enough noise, which is why I need to spin it manually
Your head contains coils, your place it on a spinning magnet that then turns those coils into dc generators and create an electrical signal. You're sending voltage down the tone arm.
Hey man, I used to be obsessed with DJ battles, between '95 and '05, and I always thought this trick was the last great innovations before the battle scene started dying. I battled myself, between '97 and '03, and I think I may have been at the same regional heat as you in '02, in Liverpool, but I may be wrong. I remember Itchy was definitely there - isn't he a big time producer now?
Easy explanation. That sound is the exact sound of interference that live sound and studio sound engineers try to filter out in their cable management.. if you run a long unbalanced cable, you're going to get RFI ingress polluting the signal chain.. You're also going to get strange artifacts that come from other properties of the cable such as capacitance and inductance.. that happens especially when you're coiling long lengths of cable and then running a signal through it.. usually it is on the low end of the spectrum. Engaging a LPF on the input mixer can help with this.. although using differential signaling (aka balanced cables) has been the best solution to this. The reason you're not needing a needle to hear something on the output stage is because those magnets are spinning around which means that there's a magnetic field (a positive and a negative) oscillating and affecting the four very sensitive very thin and very electronically susceptible wires in the cartridge that connects to the output of the turntable. Basically you're putting very sensitive wires in a oscillating magnetic field and plugging that directly into your amps.. It's going to be noisy. A few tweaks to the EQ might make it more or less pleasing to the ear.. But it's still a magnetic interference that is playing back because those 4 tiny leads in the cartridge our designed to be very very sensitive. Sound is simply electricity.. whether it be from the needle vibrating in the grooves of the record or transmitted via transformers which don't actually have the physical connection to one another, it's still a way of transmitting electricity.. And that's all it is you're creating an electrical current in those wires.
Well that's my guess. Audio engineer here...(Recording engineer by education, but live sound engineer by trade..kinda the same shit...but live sound has wayy more challenges with feedback and interference and fuckin noise ---but not an electrician..so I could be off base.. But I'm pretty sure what you're hearing is noise from that magnetic field.. And the reason you don't need the needle is the same principle used in DI boxes which use transformers to clean up a signal with ground hum ..ie lifting the ground)
Like moving coil and moving magnet cartridges. You've created that circuit another way with a moving magnet and then a pickup that is sensitive to magnetic fields moving around. I'm curious... If you stop the plateau do you get a constant tone?
@@DJBlakeyUk Ok, was kind of wondering if you've get like a DC offset, so if say you record with the cartridge on the magnet, and nothing else moving, is the signal lifted away from zero in anyway. But yeah without taking apart an M44-7, my guess is because it's a moving magnet cartridge actually moving a magnet even with the stylus off still got a sound 'cause at that point it's kind of like a guitar pickup. Does the pitch lower as the plateau slows down?
You're amplifying noise from an open circuit because the stylus isn't attached, which breaks the ground connection and introduces hum. You're also picking up electrical interference from the turntable's motor and electronics. Additionally, the platter’s mass and movement are affecting the sound through capacitive coupling, causing modulation in the signal and in part the sound.
Explanation is easy like that: If you connect electricity to an electric motor, it turns. If you turn the electric motor, electricity comes out again. The turntable's magnet moves, which induces a small current, and this current then produces the sound via the record player's pickup. (Google Translation from German)
Your Shure M44-7 is a variable reluctance design. There are 4 permanent magnet pole pieces, that form a magnetic circuit, which the stylus cantilever completes. So it is not a moving magnet design. Without any stylus, the magnetic circuit is "open", so picks up a nearby magnetic field, and the amplification is enormous. The rotor part of the turntable has multiple north/south zones, and is a direct drive stepping motor. Try circling a steel screwdriver near the rotor, to feel the effect! Have fun!
@@TuppenceHapeny Oh damn that’s a different theory to all the others so far. Gonna dive into this one. Thanks!
Just see this and i think your spot on here , the magnetic fields cross paths and amplify and yes its direct drive quartz stepping motor has multiple north and souths
@@DJBlakeyUk Yes, it effectively becomes a physical oscillator. Similar principle to Motor synth (uses spinning motors as oscillators).
This......the cartridge is essentially picking up a really bad square wave with rounded corners. But i think because of the position of the coils in the cartridge the left and right channels might be slightly out of phase. it would be interesting to see how just a single channel sounds compared to 2 channels from the cartridge.
@@lsdave It does make an almost reecey bass sound. A Reece of course is slightly out of phase, so that adds up
It's a moving magnet cartridge, so the magnetic ring on the platter will be inducing movement in the magnet in the cart. That's some serious thinking outside of the box! I'd have never thought of trying that.
@@weltschmerz88 interesting!
wow! this is a very nice way to explain it.
@@DJBlakeyUk I'm going this path also. If you have a friend working in electricity, this person should be able to safely reproduce this phenomenon on a bigger scale so you can "visualize" it.
^^^^ This is exactly why. pretty creative use of the tools available at the time
No need to move anything in the cart. The magnets of the paltter are simply generating alternate currents on the cables. Those direct motors have multiple magnets in oposite polarizations. That generates square-ish electric waves, which produce a very rich sound full of resonant frequencies. As all the magnets are pretty close, all of them interfere each other producing an even richer sound.
It's a really interesting casuality
The way the drive system for the turntable is set up, means that the magnet on the platter has lots of separate magnets side by side in a circle. This means that you have alternating magnetic poles as the platter spins. There is a corresponding set on the drive system underneath which push/pull the platter around when both are the right way up.
With no stylus attached, the spinning magnets induce an alternating current in the cables remaining in the arm, in this case that produces sound at an audible frequency (dependant on platter speed). This is similar to the way a guitar pickup works, where piece of metal vibrates above a magnet that is surrounded by a coil of electrical wire.
The exact tone of the note will be determined by the way the magnets interact with the cables and each other, plus potentially getting distortion from driving the inputs on the mixer. The wobble will just come from the platter being slightly uneven/wobbling itself.
Best sounding "trick" by miles. You made a bass synth out of a turntable lol
The minimal style of this re-do is awesome 🔥
Thank you!
i wonder if it is possible to play a tune by moving the platter back and forth instead of spinning.
@DerrickDixon-d8f maybe find a way to get it to actually spin
@@theskronklbeepcould probably do it with an adapter and large belt to the other deck 😊
I can't believe it. I have the dvd from back in the day and never forgot your set. Was only thinking about it the day and wondering what your up to. Glad to see your well.
Man, I lost my f**king mind seeing you perform this at both of these finals! Such a shame it didn't quite carry over for that world final ✊🏼 solid set to this day
Thank you. It’s an interesting one because I was aware of how good Rafik and I.emerge were, and I knew that I was never going to win the world final.
I also didn’t do great in the eliminations which is why I went on 2nd. By the time the final happened I just wanted to get through it by performing my set cleanly. I did that and therefor was satisfied. But I was only ever going to get 3rd place at best. In the end I got 4th, which I’m proud of.
The cartridge is just a mechanism for transforming analog movement on a record into electrical signals which get passed to the amplifier. When you remove the cartridge, the wiring that those signals would travel along are still in the tonearm. Placing the tonearm within the rotating field of the magnet on the platter will generate induction in that wiring, which will then be passed to the amplifier as sound.
This was one of the Best DMC winning set EVER !
You was and are an inspiration from there to now. Please stay healthy and happy.
Greetz from Austria to UK !!!
PEACE !
Thanks so much
this is a clear explanation of what truly made the early days of turntablism so interesting: limitations. Now with digital (which I love) "everything" is possible, so its harder for artists to actually think outside the box.
@@lautaroeldj I agree with that 100%
It's called Induction. It's exactly how a generator works. Passing a magnet over a wire (inside the headshell) makes a power current flow in that direction.
Yup, it should work without the cartridge installed as well.
@@RetemVictor less effective, though, as it wouldn't be a full circuit. Possibly a different interesting "instrumental" sound though
"Wire" is not the term.
It's COIL
Easy answer.... magic. This is a dope trick you figured out. To use the turntable in a way that's not what technics intended, and making people bang their heads. It's the same outta the box thinking that got people scratching rekordz.
As most people are saying, it's the magnet picking up the field from the magnetic platter. Cartridges act kinda like guitar pickups. Headphones, speakers, microphones, turntables, guitars.. all use magnets and can get funky when they get around other magnets. Dude.. I've read the yamaha sound reinforcement handbook cover to cover. I know how to build or repair a speaker. I've built my own speaker cabs. I know the "how's" but the "why's" are a complete mystery to me. How you take a magnet, a voice coil, and a cone made of paper, and it just works, accurately produces sound from an audio source? Don't get me started on vinyl. It's alchemy. Audio and music are the closest things to real life magic. As an audio nerd, this made my day! Thank you for sharing this! 🙏
"Lorentz force" if you want to learn about the physical how/why and not just the acoustic reasoning.
In layman's terms, magnets and electricity are related. Batteries have plus and minus, magnets have north and sound. If you run electricity through a wire, you create a magnetic field (electro magnet). And vice versa (a dynamo on your bicycle. Your wheel turning spins a magnet which causes electricity to flow in a wire..thus you got light).
In more macro terms: movement and wind. Try walking in a straight line with heavy side wind. And in turn, when you walk quickly, you create "wind" that can move small objects.
Now you know why the magnet moves. Why the moving magnet makes a sound, you already know
@@borstenpinsel eeyyyy yo! thank you for the detailed response 🙏 i've never heard of lorantz effect, but im about to fall face first down a google rabbit hole about it. 😅 im a dumb musician, but i really do want to understand how this stuff werks on a fundamental level. Thanks again for enlightening me to a previously unknown path to understanding
Holy shit it's you. That was very cool thing, always loved it and was do amazed. So glad this video pops up on my feed! Greets!
Just guessing, since it is a spinning magnet fixed magnet, it is causing an inductive current, which is being picked up by the cables/prongs that usually attach yo the cartridge with the needle. This needle usually moves around in the grooves, and causes an inductive current (because magnets inside). And thus you’ve actually created a big ass pickup, that creates a low frequency audible as a bass. But that’s just my highschool physics classes talking to me. With all this magnetic induction and power generator stuff.
Got an idea for you…..leave the platter on normally, but take the platter off the other turntable and place it on it upside down so you can still use the magnet. This will not only give you great stability, but also allow you to use the power and the pitch.
@@mark_spit7839 How did I not think of that! Will try it later but my initial thought is that it might be too high for the tonearm to clear it.
@@DJBlakeyUk I just tried it on my 12’s and 44-7 and while it does work, using the turntable’s power barely gives any sound - it spins too slow - it needs the high RPMs like you originally had. The tonearm height adjustment has to be at the highest as well for clearance. At least this way it’s more stable. Cool experiment tho!
The stylus uses a coil in the cartridge and a magnet on the end of the stylus (inside the cartridge) to convert the bumps in the groove on a record into an electrical signal which can be amplified. The magnet in the platter is inducing a electrical current in the coil in the cartridge.
❤❤❤ I was there the night you done this trick at the Hammersmith Apollo I think….
You signed my copy of cut master swift breaks that I bought at the event!
I remember we went home the wrong way round the M25 and went to my mates house and played on his decks till the early hours trying to recreate what you had done!
Thanks for being such an inspiration for a generation of DJs
@@djbenjiuk Thank you! Did you manage to recreate it that night?
@@DJBlakeyUk It funny because i phoned my friend - who's house we went to..
He had stanton carts and we couldn't work it out.
i think we tried it without the needle because he was scared it would break the tip.
He remembers that night, though... i wish i could post the photo of my signed Cutmaster swift - battle breaks volume 4
I was there the night you and Go won the world title a year or 2 before at the Millenium dome. I used to hang with Troubl' from France
That's just the electromagnetic inside the cart reacting to the change in magnetic field from the platter
"EMI" or electromagntic induction follow the exact same principle that youre showing here
The magnet has a magnetic feild
When the cart (electromagnetic coil) passes through the magnets feilds it generates AC signals which are amplified to an audible level
Does the magnet change polarity though? Seems the field of circular magnet wouldn't vary much.. do you know the coil I'm m447 is powered AC or rectified?
I understand why this is happening, but not going to waste space when other's have done a good job of explaining it. But damn, I have to say that's some serendipity right there! Nice find!
Yeah it really is. Pure fluke discovering it
Use some magnetic field viewing film on the platter magnet. It should show you the location of the magnet poles, which induce the oscillating fields in the cartridge windings. Amplify those oscillations and you get your wobbly bass line!
A cool little fact about the Shure M44-7… It’s is the same cartridge the DJ uses on the turntables she uses in the movie the Warriors. You can see the name of the cartridge on the first song dedicated to the Warriors by the Gramercy Riffs when she plays the song Nowhere to Run. Also another fact is that DJ was played by Lynne Thigpen… the same actress who played Carmen San Diego in the TV show from the 90’s
Yes I noticed that in the warriors. Must’ve watched that film 100 times
5:30 Magnets, how do they work?
The magnet ring itself isn't just one magnet. It's effectively a collection of magnets with alternating poles. The turntable motor then drives the platter by alternating the coils below it to drag the magnets along at a controlled rate.
Now, when you put the cartridge next to it, the moving alternating magnetic fields induce a signal in the cartridge directly.
Turns out you have just amplifed the magnetic resonance between the turntable magnet, and the small coils and parts inside the head shell. If you take a magnet and drag it over a copper coil connected to an Oscilloscope, you will see a waveform being created. Only in your case, you sent the waveform through a mixing desk and amplifier. Such a cool sound and cool move to be honest
So DJ cartridges are what's called "moving magnet" cartridges (as opposed to 'moving coil') which means the stylus is attached to a tiny magnet that moves inside a tiny coil that is fixed inside the main body of the cartridge.
The magnet moving inside the coil as the stylus tracks the groove is what causes the electrical signal to be generated in the coil and sent to the amp to be turned into sound.
Without the stylus the cartridge still has the coil and so as the powerful magnets in the platter spin they induce electrical signals in the coil which we then hear as that super-cool bassey noise
Wow thank you for the explanation!
@@DJBlakeyUk no probs - that's an utterly sick trick you did there - next level 🙏
Very similar to how electric guitars work. Sort of, lol.
@djneils100 A third type is moving iron. So the coils in the cartridge are wound onto permanent magnets, which come together. So focusing the magnetic field onto the cantilever, with a diamond stylus fixed to one end. A Shure V15 phono cartridge is this design. If you remove the stulus assembly and try attract a tiny piece iron to it, you can see the cantilever is not magnetised.
Just watched the whole set on RUclips. What a great performance. Unique style and originality. Plus you've lost loads of weight. Looking good brother.
@@getthoseskills4451 thank you! Massively appreciate it
@@DJBlakeyUk No worries man
What your hearing is the iron crystals moving in the cartridge magnets in reaction to the larger magnet, the crystalline structure is moving in relation to the magnetic field of the larger magnet being pulled and repelled making the iron crystals in the cartridge head oscillate, this in turn sends the signal to the speakers giving the oscillating bass tone.
it's basically a mechanical oscillator the magnets in the platter have a magnetic field and are interacting with the open circuit as you removed the stylus in the cartridge.
Yooooooo that’s so ill. Love the old Dmc guys that would physically do something with their routines! 🤯🤯🤙
Hahah bro I was watching your routine the other day.. always loved that part, the dub be good to me into the 1 bar roll is perfect
@@UziMusic 🙏🏻🙏🏻
That is magnetic resonance, it's the sound of the magnetic field as it passes by the tone arm, and it's conveyed by the metal tonearm to the cartridge
What you can hear are the lines of force of the magnet on the underside of the platter at they interact with the magnets in the cartridge...
A conductor, a magnet, and motion are the three things needed to make electricity. The spinning magnet on the plater is inducing a magnetic field into the conductive coils of the cartridge, thus producing a voltage that is played back through your mixer/speakers as sound.
I guess you could call him a conductor! But DJ suits what he does much better, don’t you agree?
that was crazy but epic at the same time. the sound the magnet gave off was awesome
This is a beautiful application of magnetic induction; My collegue is currently trying to design an antenna to drive magnetic dipole transitions in a solid state samples; I sent him this as an inspiration.
One would think that coils are required to pick up an electric signal, but in reality anything can pick it up, the coil just amplifies it. In this case the magnet is so strong that it doesn't neet that. What you hear is the real-time spinning of the magnet plus overtones and some modulation form the wobbling of the arm and the plate.
Love this, thank you!
@@DJBlakeyUk Have you released a track or EP with this bass effect?
@@Testgeraeusch I havn't!
@@DJBlakeyUk Do you want to? :)
A sort of Hall effect, similar to those used in automotive for the cam and crank position (and other) sensors. would be my guess. The gaps in the magnets causes the magnetic field to fluctuate and picked up by the control arm as a sine wave, converted into sound waves with varying modulation dependent on the speed of the of the platter as it rotates... A guess, but I'm not a mechanic, electrical engineer, or musician...Still a nice effect though!
It is the magnet on the platter that the induction motor in the player uses to move the platter. It is literally doing what a hard drive does!
That giant magnet on the platter is ALWAYS interacting with the needle, it’s one reason why belt drives are better for sound quality but of course they suck for djing tho some djs have used thoren belt driven tables (namely larry levan)
Well, at normal playback speeds, the frequencies generated would be below anything audible if they were picked up at all.
*The magnetic static sectors are pulsing through the tone bars amplifier.*
Blakey! do you know how many damn times I've watched your 2004 performance???? COUNTLESS! one of the sickest! In my opinion, that's my favorite year of DMC
Wow thank you! 🙏🏻🙏🏻
My question would be: why does it normally *not* pick up this sound? I think there has gone quite some engineering in keeping these magnetic fields out of the pick up element in normal operation. Always amazing how much thought went in these devices that "just work".
Definitely so magnetic magic going through the cartridge very cool subbed
@@MRSTU1210 🙏🏻
That trick stayed in my mind because it was original and created a wicked bass sound in a unexpected way.
Just watched your full set were you did this trick wow amazing performance pal
I believe the magnet in the middle is not a simple minus inside and plus outside thing, but alternating +-+-+-+-+-..... inside and outside. This would explain the squarewave sount in your wobble. The magnet then does what your stylus does inside the cartridge but way slower, explaining the deep sound. If you would put magnetpaper to vizualize the magnetic field on the magnet, you would literally see your sound signal going to the cartridge, like transients on a daw. Now you could spinn the platter faster to get a higher sound and slower to get deeper pitched sounds.
It it was some sort of magnetic field as you said, it would be a more syne like sound, which would be too low frequency to hear.
It utilizes electro magnetism a magnet passing a wire or multiple causes and induced current in the wire giving a signal to your system. And it being such a low frequency it sounds to the human ear like bass
It's pretty simple the spinning magnetic field is inducing current into the cartridge
Sounds great. Lovely scratches. Nice control. Must be easy 😳🤣 love it
The spinning magnet on the back side of the platter is creating a small (but varying) electrical current current by electromagnetic induction. The rate of spin influences the 'tone', a quick sample reveals the fundamental starts at 60 hz and drops to about 40 hz as the rotation of the turntable slows.
From Stanford Magents:
`Magnets generate electricity through a process called electromagnetic induction. Here's how it works:
Relative Motion: To generate electricity, there must be relative motion between a magnet and a conductor (usually a coil of wire). This can be achieved in various ways, such as moving a magnet through a coil of wire or rotating a coil within a magnetic field.
Magnetic Field Interaction: As the magnet moves, the magnetic field around it changes relative to the conductor. This change in the magnetic field causes the magnetic flux through the coil to vary.
Induced Voltage (EMF): According to Faraday's Law, this change in magnetic flux induces a voltage in the conductor. The faster the change in the magnetic field (i.e., the faster the relative motion between the magnet and the conductor), the greater the induced voltage.
Electric Current: If the conductor is part of a closed circuit, the induced voltage drives an electric current through the circuit, generating electricity.`
never rly watched the DMCs but my god, this is something else, never mind thinking outside the box, thinking outside the platter
Thank you 🙏🏻
@@DJBlakeyUk legend! i gotta give this a go actually blew my mind these discoveries always tends to be a "one night at home" situation with a few beers
*inside the platter
@@N1h1L3 well done mate, you get a blue peter badge for that, top lad.
I was at that final ! I’d been going since 88 it was great to see the event developing
Yes Blakey! Iconic!
Cool sonic discovery! When viewed through magnetic field paper the polarization of the technics ring magnet alternates radially dozens of times, another experiment would be running a cassette tape head over the magnet to hear if the effect is replicated that way.
I had seen some of these but that Dj Woody clip blew my mind.
You can hear it, its the irregularities on the surface of the magnet edge. I bet if you sanded and polished the edge of the magnet surface the needle is laying on than the sound would be a lot more muffled sounding instead of the sharp bouncy tones in the sound.. like comparing a kick drum with and without padding stuffed inside.. minus the ringout..
@@Z-Ack Interesting take. The guy who services these decks is already unhappy with me for doing this. Not sure what he’d think if I started sanding the magnet 😅
What the hell am I watching 😂 madness.
Also can't believe you can't play your own set due to copyright lol
I’m an Electrical Engineer and no musician so I’m not familiar with a turntable (especially never having had one). However I can tell you in simple terms what’s happening. Magnets and electricity share a direct relationship, any electricity run through a wire creates a magnetic field, and a magnetic field creates an electric charge. Two simple examples are a wire winding that becomes a very powerful magnetic (like the ones they use to lift cars for a crusher, or a speaker cone) and a collapsing magnetic field creates electricity (wireless charging, or that “thump” you would hear with older amps when you turned them off (diodes are typically used to prevent this now). Similarly you might hear a buzzing in your headphones if you are close to a power cord.
As the magnets in the “cassette” I believe you called it change poles (North to South) while spinning, the generating and collapsing magnetic fields are picked up in the wire (in the tip of the “arm”) created an equally oscillating voltage in the wires. (This is the very basics of wireless charging). I would imagine that if you flipped the cassette upside down (without spinning it) and simply waved the arm back and forth over the magnets you a similar effect.
The cartridge contains a magnetic pickup (not unlike those found on a guitar) made to pick up electric currents and convert them to an audio signal. Whenever you move a magnet you create an electric current, which is then picked up by the magnet inside the cartridge. It's that simple!
@@fabiofzero Yes it seems like that may be the answer, a few others have said the same. Tbh, I still don’t really get it 😅
The amplification of the tone arm picked up the magnetic field
YOOOOOOOOOOOOOOOO 2007 I Started & All those sets with the Tricks, Scartch Perverts, PLUSONE, Dopey is what i was trying emulate(ITS COOOL) and of course that Cartridge is the only this that could survive such ABUSE. BUT MY. MAN you flipping the PLATTER over Flipping the TRICKS on its HEAD, even more so than PrimeCuts, your trick too me without the stylus. its the ONE MAN
All the stylus does is move small magnets up and down and side to side in the cartridge. The cartridge works a bit like a microphone so two coils picks up the movement of the magnets sending an ac signal to the pre-amp. By spinning the platter you’ll have and alternating magnetic field coming from the ring magnet and the magnets inside the cartridge will be vibrating all over the place
Holy shit I had that years finals on DVD. Watched that so many times. I remember Daredevil i think it was always doing that finger thing between beat juggling. Was such a good finals and you win was fully deserved!!
🙏🏻
The needle transfers kinetic energy to electrical. The magnetic feild is being transferred similarly
I find it amazing that this was discovered by accident. It’s defiantly caused by the magnets moving past the coils in the cart if it mm or mc I don’t know but it makes no difference it only needs motion between any magnet and the coil in the cart moving or fixed. It wouldn’t work with a ceramic pickup.
That’s definitely caused by not defiantly caused by sorry don’t know how that happened.
Simply vibration because the cartridge is making contact with the four inner contacts with the spinning platter picking up vibration noise.
Its been a while since i saw that 2004 dmc video . Musicians do wonders when you are not using too much theory but experiments and hands on practical :)
As the stylus interaction with the cartridge is an electromagnetic pickup of vibration realyed from the grove of the record the magnet on the bottom of the platter is interacting with the pickup within the cartridge and that is where the noise comes from. Hope that makes sense.
That’s dope as hell! Watching your set 🔊
The duh explanation is the magnetic field is interacting with the cartridge which uses electromagnetism (like guitar pickups, microphones…) The specifics.. 🤷♂️
I have a technics 1200 mk2.. just tried it, totally worked and sounds cool
Magnet is moving, so there is a changing magnetic field that induces charge in the wires ;)
It’s certainly interesting to see if someone can answer your question at the beginning of the video about why the turntable is making that sound. But what’s equally interesting to know is how one even comes up with the idea of flipping the turntable and being so motivated to take the extra steps until this absolutely cool sound comes out. This kind of thing surely doesn’t happen when you’re sober. 😉😂 But seriously, great idea, respect! 😀👍
@@chrisegger 😅😅 I may have had a beer or two
@@DJBlakeyUk Awesome answer Bro 😅😅 - that was a different time in the 2000s, but again big respect for developing such a trick even after "one beer or two" 😉😅 - Love your channel, all the best 👍🔥
@ thanks ! 🙏🏻
Genius, you made a magneto mechanical synthesizer😃
reminds me of the scene from The Hunt For Red October, where Jonesy the sonar operator takes the recording of the "seismic anomaly" and speeds it up 10x "That's gotta be man-made"
That is the sound of inductance. You have a magnetic cartridge that is being inducted by a far larger magnet. 🧲. The magnet(s) on the head is simply a voice coil. . Love your work.
To this day that stills blows me away seeing it.
I was like this dude is a madman and I loved it. Thank you for sharing this.
Only thing I could think of is that it’s still picking up resonance from the cable pickups from the cartridge but I’m just guessing
Thanks Gonz! Hope you’re good 🙏🏻
@@DJBlakeyUk yes sir. Doing great
Giving a different perspective, guitar pickups produce sound by vibrating metal near magnets. That's essentially the mechanics going on here to make a sound that is electronically picked up--just moving the magnet near wires instead a guitar string over a pickup.
A friend of mine was spinning some acetates of his own records that he'd had cut that week for a set, someone came along and did the most aggressive rewind ever and something happened to the stylus which produced a similar effect for the rest of the set, just an extra, constant 40hz rumble under everything 😂
I remember this, absolutely crazy! 🔥🔥🔥
1:19 reminds me of a time I just caught the end of when I was hitting the clubs. All those turntables. Nowadays, it seems like you just get two (or none). Where can I find music that's mixed multiple songs together, not just two, at a time (for the most part)?
The disc is a magnet with multiple poles. Lots of N S N S poles, so the electromagnets in the machine can turn it. your magnetic pickup coils in the cartridge are picking up the motor magnets as it spins.
Imo, you’re amplifying the vibration from the magnet which causes an oscillating sound. Like how plate and spring reverb works.
Alternating magnetic field inducing a current in the head windings 👍🏻
Proper original 🔥Whole set was like a 6min turntablized Fabric Beatdown Room 1 set💣
@@deejaygo294 Yes Go! Thanks mate
Your impression is most likely correct. This operates basically the exact same way an electric guitar pickup works. When you spin the magnet, you create a modulating magnetic field, which is being passively picked up by the leads in your cartridge. People have made similar sounds using fidget spinners and guitar pickups.
*i have no idea but its epic*
The cartridge is an MM which stands for Moving Magnet. I assume the platter magnet vibrates the internal magnets of the cartridge.
@@DJ_AMO_UK That’s super interesting thanks man. Gonna look into it
The same was essentially realized in the late 19th century, and was keyboard controlled. They used to pipe it into hotels and the like by wire.
Isnt the direct drive part sending to energywaves to the magnet? Try that without the powersource, maybe. Or push on 'start' when power is on and check with the 33/45 setting if the sound if changes. That will tell you a lot.
@@tonybeatbutcher That’s super interesting I’ll give those a go
Cheers, bro. Greetings from a turntablist. I was thinking if would make sound on directly on the direct drive part or with other magnets
a ring magnet inducing a current in the pickup coil
Dear DJ Blakey. May I sample the sound which is playing from 3:44 to 4:02?
Go for it! Would love to hear what you make with it
spinning magnetic field inducing voltage on the wires running from the cartridge, you've made a generator. mV signal from the stylus is super amplified and it is also amplifying your generator mV. does speed change the pitch?
@@davesnothere8859 Yes moving the platter faster changes the pitch. It needs to spin very fast though to make a good enough noise, which is why I need to spin it manually
Your head contains coils, your place it on a spinning magnet that then turns those coils into dc generators and create an electrical signal. You're sending voltage down the tone arm.
Hey man, I used to be obsessed with DJ battles, between '95 and '05, and I always thought this trick was the last great innovations before the battle scene started dying. I battled myself, between '97 and '03, and I think I may have been at the same regional heat as you in '02, in Liverpool, but I may be wrong. I remember Itchy was definitely there - isn't he a big time producer now?
@@bubz3t136 Yes that was me. I was there with Itchy, now known as Hudson Mohawks. What a career he’s had 🚀
is that i luv u by dizze rascal at 0:30 ?
I luv u...
I, I, I I I, I, I... I...
I luv u
I luv, I luv, I luv, I luv...
Easy explanation. That sound is the exact sound of interference that live sound and studio sound engineers try to filter out in their cable management.. if you run a long unbalanced cable, you're going to get RFI ingress polluting the signal chain.. You're also going to get strange artifacts that come from other properties of the cable such as capacitance and inductance.. that happens especially when you're coiling long lengths of cable and then running a signal through it.. usually it is on the low end of the spectrum. Engaging a LPF on the input mixer can help with this.. although using differential signaling (aka balanced cables) has been the best solution to this.
The reason you're not needing a needle to hear something on the output stage is because those magnets are spinning around which means that there's a magnetic field (a positive and a negative) oscillating and affecting the four very sensitive very thin and very electronically susceptible wires in the cartridge that connects to the output of the turntable. Basically you're putting very sensitive wires in a oscillating magnetic field and plugging that directly into your amps.. It's going to be noisy. A few tweaks to the EQ might make it more or less pleasing to the ear.. But it's still a magnetic interference that is playing back because those 4 tiny leads in the cartridge our designed to be very very sensitive.
Sound is simply electricity.. whether it be from the needle vibrating in the grooves of the record or transmitted via transformers which don't actually have the physical connection to one another, it's still a way of transmitting electricity.. And that's all it is you're creating an electrical current in those wires.
Well that's my guess. Audio engineer here...(Recording engineer by education, but live sound engineer by trade..kinda the same shit...but live sound has wayy more challenges with feedback and interference and fuckin noise ---but not an electrician..so I could be off base.. But I'm pretty sure what you're hearing is noise from that magnetic field.. And the reason you don't need the needle is the same principle used in DI boxes which use transformers to clean up a signal with ground hum ..ie lifting the ground)
@@nickloss2377 Love this, thank you for the detailed explanation. I had a hunch it was magnetic fields
It's not RF it's EMI caused by EMF...
This is a guess, opposing poles?..
Ive got this on dvd from back in the day!!
Like moving coil and moving magnet cartridges. You've created that circuit another way with a moving magnet and then a pickup that is sensitive to magnetic fields moving around. I'm curious... If you stop the plateau do you get a constant tone?
I believe it doesn’t make a sound when it’s still but there is a chance it makes a quiet one that I missed
@@DJBlakeyUk Ok, was kind of wondering if you've get like a DC offset, so if say you record with the cartridge on the magnet, and nothing else moving, is the signal lifted away from zero in anyway. But yeah without taking apart an M44-7, my guess is because it's a moving magnet cartridge actually moving a magnet even with the stylus off still got a sound 'cause at that point it's kind of like a guitar pickup. Does the pitch lower as the plateau slows down?
You're amplifying noise from an open circuit because the stylus isn't attached, which breaks the ground connection and introduces hum. You're also picking up electrical interference from the turntable's motor and electronics. Additionally, the platter’s mass and movement are affecting the sound through capacitive coupling, causing modulation in the signal and in part the sound.
Wwoww that was you!! Cool trick, still remembering that.
@@tonybeatbutcher Thanks! 🙏🏻
Explanation is easy like that: If you connect electricity to an electric motor, it turns. If you turn the electric motor, electricity comes out again.
The turntable's magnet moves, which induces a small current, and this current then produces the sound via the record player's pickup.
(Google Translation from German)