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Monthly Archives: May 2019

  1. Turntable and tonearm

Turntable consists of a platter connected to a shaft in a rotating, cylindrical, and platter rotating on a bearing located at the bottom of the cylinder and in contact with the drive, the two components will rotate thanks to the motor or belt, and the plinth. These are the 3 main components of a vinyl tray. Platter is usually made of aluminum, or monolithic so that it does not resonate and has a heavy weight from 3-5kg to stabilize and prevent vibration. Turntable needs to balance so that the platter and shaft do not lose weight, tilt sideways, in the long run easily damage the belt and make worn bearing. Motor use in the long term also needs to be lubricated so that maintenance is not dry or hiss. Some good turntable will usually have anti-vibration feet that adjust height. And in addition, there are some wheels like Linn Sondek LP12 or AudioCraft AR-110 outside the outtriggers that vibrate, the platter face is connected to the tonearm surface, these two components are supported by springs and separated from the case as well as motor wrongly completely vibrates.

Tonearm is where we attach the needle. Tonearm includes counterweight, anti-skating anti-skid, and various moving mechanisms: unipivot, gimbal, bearing. Good tonearm materials are usually brass or titanium nitride because they are very light and good in resonance, when playing more bass and deep with no vibration.

  1. Phonostage

Many of you still think that the sound of vinyl discs is the most original and closest to the recording. Yeah, this concept is due to you guys selling discs or selling hi-end goods. In addition to the mix and cut discs directly, some vinyl discs are remixed from the original master tape and then cut and stamped into different versions. During the process of creating the disc, the signal has been processed, has been calibrated EQ, why is it because of the cutting lathe it is difficult to engrave the information that is too large and the sectional area is not may be too deep, thus affecting the life of the needle tip (often very expensive).

  1. Cartridge

As above, I have mentioned two types of cartridges, namely MM and MC. The cartridge’s task is to sweep up the small grooves on top, releasing most accurately the vibrations on the grooves. The cartridge consists of two parts, the stylus and the body. The tip of the cartridge is often used with extremely high hardness components and is generally an industrial diamond compared to diamond in jewelry products, which do not have the same purity and clarity as on jewelry but equal hardness. Diamond heads are often sharpened into a very small point, with several different cartridge standards such as Nude, spherical, elliptical, Shibata … each of which will have sharpness as well as contact points into different disc slots. The more sharp and exposed the more expensive, typically fine line and elliptical. When scanning on the disc groove, the movement and movement intensity of the stylus is what is transmitted into the frequency and intensity of the volume, generally the sounds that you hear through vibration of stylus needle first. The stylus drives into the small, slender cantilever, which is a stylus that places the stylus tip and will also vibrate under the needle tip and vibrate the transmission to the inside of the cartridge body.

There are 2 types of cartridges: Moving Magnet (MM) and Moving Coil (MC), although both cartridges use the principle of physical regeneration based on motion in the electromagnetic field. Like the Moving Magnet, the MM needle magnet will be in the cantilever tree moving to regenerate the current while the two coil parts on the cartridge will be fixed. In the case of Moving Coil, the tail of the cantilever will have a coil attached to the tail and the magnet will be fixed.

However, according to folklore, the MM head will have a common needle tip with the ability to easily change the stylus head and the durability is higher than that of the MC, as well as the current intensity is also higher than the MCs. The first MC is more expensive, uses smaller sized diamonds, makes it more difficult to manipulate, does not replace the stylus, is more fragile and the current intensity is also smaller than that of MM so it needs a Step-up transformer or a phono preamplifier circuit separately for MC to increase the amperage to match phonostage. The MC, due to its small needle tip and slim cantilever, is less resonant, responds quickly to the notched lines on the disc groove and less dust trails, so it is more clean, static and clear than when listening to the sound of MM.

The principle of operation of MM and MC is that the reciprocal magnetic field is generated from magnets and small coil rings, which will produce electrical signals with small variations. The current will be amplified and transmitted to the amplifier to output the speaker. In many cases you need to use a phonostage as an intermediate bridge between turntable and amplifier or pre-amp.