Yamamoto Sound Craft HSA-01 Head Amplifier Internal Head Shell

At the time of analog record playback, the tone arm is entered between the cartridge and the phono equalizer amplifier, and inside it, the lead wire much thinner than the shell lead is used with a length of 30 to 40 cm. Therefore, the amount of information is thought to decrease drastically by the time it reaches the phoneequalizer amplifier by the resistance of the minute signal generated by the MC cartridge. As a measure,

The HSA-01 was developed as a head shell with a built-in head amplifier that greatly amplifies the signal level in the nearest part of the cartridge to prevent a drop in the amount of information.

The HSA-01 has a head amplifier with 14 times amplification rate inside the head shell. The head amplifier is built into the convex part of the shell base, and only the battery is visible from the back.

A simple, high-performance amplifier circuit with an all-analog configuration succeeds in obtaining a large output of about 0.9V with a limited supply voltage of 3V.

This machine uses CR1632 types of lithium-ion coin batteries, and the continuous use time is about 60 hours, so that the annoying battery replacement is minimized.

Simply install the cartridge, wire it and turn on the slide switch on the top of the shell.

The amplifier part of the HSA-01 is miniaturized to the limit because it is incorporated in the headshell, and the internal circuit is listened to by listening

We use carefully selected high-quality parts. Even with such a miniature amplifier, the changes in the sound caused by the parts will occur greatly. The printed circuit board and battery holder of the main parts are gold plated as sound quality countermeasures.

The frequency characteristic of the HSA-01 is + 0 from 10 Hz to 100 kHz, -1dB and very wide band. Since we faithfully reproduce ultra-low and ultra-high signals that we have not noticed before in record playback, the familiar records may be reborn as different things. In addition, in order to increase the signal level close to the cartridge, the impact of resonance of the tone arm causing the howling may be reduced and the howling margin may be improved.

The shell body of the HSA-01 is made by precisely cutting out very hard and precise African ebony with NC processing machine of Yamamoto. For the built-in head amplifier, the outline must be as small as possible and the weight should be as light as possible. This product was not realized by Yamamoto, who owns the processing machine. The power switch is placed on the upper surface of this body, the power supply is turned on and off on the upper surface of the shell, and the display by LED is also possible.

Since the amplification ratio (boost ratio) of the HSA-01 is set to 14 times (23dB), the output of the MC cartridge of the output of 0.2mV is 2.8mV amplified and fits most MC cartridges. The input impedance of the connected phono equalizer amplifier is considered standard 47kΩ, please connect the output from the arm directly to the PHONO input terminal at the MM position.

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When using HSA-01, the power switch at the top of the shell is turned off, and it can be used only by turning the power switch on after normal cartridge and shell replacement work. When installing the head shell, set the preamplifier volume to the minimum when turning the power switch on. Its own weight is 12.5g and standard as a headshell, so it can be used in most arms.

Fit Cartridge	MC cartridge 0.1mV-1mV output voltage
Head amplifier	Gain (boost ratio): 14x (23dB)
Maximum output	0.9V
Frequency Characteristics	10Hz-100kHz(+0, -1dB)
Use Battery	CR1632 Type, Lithium Ion, Coin Type Battery (3V) 1 Included (Overseas products are not included due to export restrictions)
Head shell body part material	Body: African ebony material, precision shaving (clear and eco-paint finish)
Fingertips	Brass (non-magnetic gold plated finish)
Dimensions	18 (W) x 50 (L) x 21 (H) mm
Weight	12.5g (including lead wire, without mounting screw)

Before degrading the music signal of a small MC cartridge through a long cable or contact point, boost it immediately after the cartridge picks up the signal from the board surface, you should get a higher purity sound! The new product HSA-01 incorporates the MC head amplifier into the headshell. The company's most popular ebonyThe head amplifier is incorporated into the head shell HS-1A, and the more you look at it, the more you admire it.If you use a precision driver, you can easily detach a coin-shaped battery. The weight of the entire head shell, including the cartridge, depends on the weight of the cartridge, but it would be easier to balance the subweights. By the way, the turntable DENON DP-70M used this time cannot be zero-balanced when 11g cartridges are installed, and subweights are used.
The freshness of the sound is extremely high.This time the MC cartridge uses Jasmine audio middle class forest (0.34mV), not only demonstrates the performance of the cartridge firmly, there is a sense of direct, high resolution, very clear sound. The presence and air of live sound sources such as musical instruments and performer's muttering are clearly conveyed.
Thin lines and various contactsAs you pass through, the weak message that has finally arrived is amplified using the expensive MC transformer and head amplifier, the purity does not fall at the forefrontthe weak signalThe amplifier is not affected externally, and high quality high sound quality is obtained. Moreover, because the amplified signal is delivered, the MM phoneequalizer side will also have considerable room for gain, so cost performance is also very good gem.