Stereo Professional Cutting Head and System

[Thelatheofus]

Nice, thanks for this experiment and for providing infos and measurements !
What's the weight on those torque tubes and the rest of the moving elements ?
What kind of suspension for the moving coils did you chose ?
And lastly, how did you manage the electromagnetic properties of most elements (mainly the driver's enclosure) ? That's probably the point where I'm more clueless

[rubenr]

NINJA
stereo cutter head.
That's what we'll call this head.
The dynamic transducer works, I am very impressed with how it works
I made the speaker drivers in 2-3 hours, no more [they worked quite well].
This NINJA driver was practically factory-made and took me 12 days to assemble. There's a dramatic difference from the speakers.

They haven't been tested with the system yet, but I can already hear and see that they'll be good.

Really good motor driver troll ! yeahhh!

[zdenek]

Yes, it's about three years ago that I made this head [three years ago, one of the first] in a plug housing, a Canon 15-pin connector for pressing [no more than two hours' work] at 78 rpm, two 2x1W 8-ohm speakers. It surpassed in fidelity, quality, and frequency response by at least 10 orders of magnitude those Chinese 20W 4-ohm vibration speakers, some of which trolls use to break the heads. I made it in less than two hours... look at the dimensions, it's smaller and lighter than a 9V 6F22 battery. The sapphire stylus is almost untouched, there's no wear, and I've pressed at least 100 CDs and DVDs without heating.

[zdenek]

All dimensions for the NINJA stereo cutter head and materials will be made public.

[zdenek]

It was supposed to be brass, and the handle is brass, but the Chinese guy mixed up the dimensions—where the diameter is, he made the length, and where the length is, he made the diameter.

The Chinese guy told me not to return the incorrectly made handles, but he'll make another one for free with the correct dimensions, 100 pieces. But I have to wait another two weeks... gee.
[it came out to $2 per piece x100per ]

[zdenek]

Ninja professional transducer test with feedback, signal reading via microphone. video https://www.youtube.com/watch?v=Wgce0zfXeo8

[zdenek]

Driving this NINJA stereo cutter head with these drivers is captured in this video [a little live thrill]:
https://www.youtube.com/watch?v=UD-d3iycJj8

[this is a very dangerous ride]
A complete security system for the cutting head is needed because the lack of a system ends in disaster, i.e. a loss of relatively large amounts of money...[we estimate that around $3,000...]

[zdenek]

Here are the dimensions of the Ninja transducer:
Neodymium magnet diameter: 25mm [approximately 1 inch]
Neodymium magnet height: 6mm
Neodymium magnet inner diameter: 14mm
Magnet power: N50, magnetic pull: 25kg/cm
Magnetizing force: 5kV x 100kA
Coating: Copper chrome
Core diameter: 99% low-carbon steel, inner pole piece: 20mm outer diameter,4mm,thickness, inner axial diameter: 8.90mm
Upper closing pole piece: 32mm outer diameter, inner diameter: 9.30mm, core thickness: 3mm in pole piece: 2.5mm, material: low-carbon steel. Inner core coating: boron nitride. The transducer was magnetized after the magnetic field poles were closed.
The magnetic force in the field gap was 4.5T.
The dimensions provided are not for industrial production.
[will vary slightly due to Zenec Corporation US Patent protection]

[zdenek]

Conclusions.
The main reason for the audio bandwidth limitations introduced by loudspeaker-based cutting heads is their absolutely excessive mass and the specific gravity of the magnetic system. This refers to the drive coil bodies, the coil suspension system, the rods acting on the so-called "resonance tube" and its mass and weight.
The worst part is that such heads lack feedback, which is absolutely responsible for signal transmission. All these causes and errors are critical to the quality of the audio bandwidth transmitted by so-called tweeter-based cutting heads.
In short, they lack the appropriate physical acceleration needed to record high acoustic frequencies.

[Thelurker]

Conclusions.
The main reason for the audio bandwidth limitations introduced by loudspeaker-based cutting heads is their absolutely excessive mass and the specific gravity of the magnetic system. This refers to the drive coil bodies, the coil suspension system, the rods acting on the so-called "resonance tube" and its mass and weight.
The worst part is that such heads lack feedback, which is absolutely responsible for signal transmission. All these causes and errors are critical to the quality of the audio bandwidth transmitted by so-called tweeter-based cutting heads.
In short, they lack the appropriate physical acceleration needed to record high acoustic frequencies.

A load of nonsense!

[zdenek]

Conclusions.
The main reason for the audio bandwidth limitations introduced by loudspeaker-based cutting heads is their absolutely excessive mass and the specific gravity of the magnetic system. This refers to the drive coil bodies, the coil suspension system, the rods acting on the so-called "resonance tube" and its mass and weight.
The worst part is that such heads lack feedback, which is absolutely responsible for signal transmission. All these causes and errors are critical to the quality of the audio bandwidth transmitted by so-called tweeter-based cutting heads.
In short, they lack the appropriate physical acceleration needed to record high acoustic frequencies.

A load of nonsense!

If that's your opinion, well, everyone is entitled to their own opinion...
"The truth will always come out in the end."
Unfortunately, what I wrote is true, and it's pure physics in its purest form. I've personally conducted hundreds of experiments with various tweeters, including vibrating tweeters, which are most often used in amateur heads these days. The results are very low quality, and the frequency response of these pseudo-heads is no greater than a few thousand Hertz.
There are sellers who sell tweeter-based heads [even for several thousand dollars], and I'm very, very surprised that buyers don't file claims and demand refunds. It's terrifying.

[zdenek]

Which of these transducers would you use for the cutting head? The larger one has a voice coil over 50mm [two inches] in diameter and a power output of 1000W, while the second one has a voice coil 10mm in diameter and a power output of 1W?
Do you think the big one is better because it has a power of 1kW? Yes?

[Thelurker]

Try and finish a simpler project first instead of diving into feedback heads! You have a long expensive road ahead that I guarantee you will give up on.

If you can’t even build a good sounding dynamic you have no chance!

[zdenek]

Try and finish a simpler project first instead of diving into feedback heads! You have a long expensive road ahead that I guarantee you will give up on.

If you can’t even build a good sounding dynamic you have no chance!

I don't intend to sell a proverbial "pig in a poke" for several thousand dollars and claim there's a pigs..."
Everything is calculated.
I'm allocating $100,000 for the project.
I'm in the process of building a SAL74B system, a complete copy of this system [it's as simple as a flail, but it takes time because there's money].
The first warhead will go to the USA to the owner President of this website, TSSOLT , as a gift of gratitude.
So, peace of mind and you can sleep soundly.

[zdenek]

I have such a beautiful "pig" made of "gold."
From the outside, this "pig" is fantastic, beautifully crafted, but its value as a cutting head is worth more to me than a Canon plug, or a pound of lint and a match...
I think more than one buyer would be fooled by this brass "pig."
You have to test these things before paying, because you can easily be fooled. I've said it before...

[zdenek]

pigbrass

[zdenek]

This is a "pig", it does not record properly, the maximum bandwidth is 7 kHz, the higher frequencies are not audible.From the outside, it's a super mechanical process using very precise milling machines or lathes. The appearance of this "pig" is stunningly beautiful, but unfortunately, it's poor art...

[zdenek]

And one more photo.

The aluminum body houses drivers with an output of approximately 2W, 8ohms, 8mm coil diameter, and flat-wire coils. Helium-cooled.

Frequency response is almost 30kHz, with a resonance of 2kHz. This prototype head is capable of recording signals up to 20kHz with a falloff of about -6dB. This is a truly dynamic and fantastic amateur head.

Believe it or not, I'm telling you the truth.

[zdenek]

I had to calibrate two instruments, Fluke and Finersi, based on the calibrator [my oldest instrument], an English, military Baldwin Instrument Co. Ltd. from 1943, the results are satisfactory, although both digital multimeters slightly distort the battery voltage measurement, but overall acceptable. video https://www.youtube.com/watch?v=LatradxvojI

[zdenek]

Attention!
The second NINJA 2 head is being reserved.
[The first NINJA 1 will, of course, go to the President of TSSOLT]
So NINJA 2 will also go to the US. I'm not revealing who yet, as he might not want it.
NINJA 2 will go to someone who has a realistic and genuine understanding of vinyl recording, not a theoretician, but a true practitioner and vinyl enthusiast! Free stereo cutter head NINJA2 ,free shipping, for the truth!
Question: who will forbid a rich person from giving gifts? Right? Right!