YAMAMOTO

HSA-01 is the epoch-making head shell which built in head amplifier in head shell.

Exchange of the shell lead inside head shell knows well that sound will change a lot.
It means being greatly influenced by a lead etc. in the portion with a small signal level.
At the time of analog record playback, a tone arm enters between a cartridge and
Phono equalizer amplifier, and the lead thinner than a shell lead for whether your
being Haruka is used for the inside by a length of no less than 30 - 40 cm.


Therefore, the detailed signal produced in MC cartridge is considered that the amount
of information will decrease sharply by the time it reaches Phono equalizer amplifier by
a part for the resistance etc.
As the measure, the head shell which built in the head amplifier which amplifies a signal
level sharply in the portion nearest to a cartridge was developed at our company so that
the fall of the amount of information might be prevented.
HSA-01 builds in the head amplifier which had one 14 times the amplification rate of this
in the inside of head shell.
A head amplifier part is built in in the convex part of a shell root, and has structure where
only a battery appears from the reverse side.
Usage can be immediately used only by wiring by attaching a cartridge and turning ON
the slide switch on the upper surface of shell.

In order to incorporate the amplifier part of HSA-01 in head shell, it miniaturizes to a limit,
and high-quality sound parts are chosen, selected carefully and used for the internal circuit
by audition.


Even if it is such micro amplifier, change of the sound by parts comes out greatly.
The printed circuit board of main parts and the battery holder are using it by performing
gilding processing uniquely as a measure against sound quality especially.
Although the amplifier circuit serves as disclosure, it has succeeded in obtaining about 0.9v
big output with limited power supply voltage called 3V by the simple and highly efficient amplifier
circuit by all analog composition.
Moreover, since it is battery drive amplifier, the hour of use is also important.

In this machine, by lithium ion coin type battery use of CR1632 type, continuous use time realizes
about 60 hours, and it is considered so that troublesome battery exchange may become the minimum.


The frequency characteristic of the head amplifier part of HSA-01 is very a broadband with
+0 and -1 dB to 10Hz - 100kHz, and this serves as the characteristic unrealizable by any Step up transformers.
Since the signal of the super-low-pass one which he has not noticed by record playback until now, and a
super-high region is reproduced faithfully, a familiar record may be again born like a different thing.
Moreover, in order to raise a signal level by the nearness of a cartridge, the influence of resonance of the tone arm
leading to howling is reduced, and the example where a howling margin improves is also reported.
(It changes with states of the room which hears a record.)

With NC processing machine of its company, the shell main part part of HSA-01 began to delete the very hard
and precise Africa ebony material precisely, and is producing it.
Since head amplifier is built in, it is necessary to make an outside small as much as possible, and it is necessary
to make weight light to a limit.
This is self-confident as that it is the product which was not realized if it was not our company which owns a
processing machine at its company.
A power switch is arranged into the upper surface portion of this body, ON of a power supply and OFF are carried
out on the shell upper surface, and the display by LED is also enabled.
Since the amplification rate (Step up ratio) of HSA-01 is set up 14 times (23dB), the output of MC cartridge of a
0.2mV output is amplified by 2.8mV, and suits almost all MC(s) cartridge.
The input impedance of the Phono equalizer amplifier to connect should set to 47kohms made into a standard,
and it is MM position and please connect the output from an arm to a PHONO input terminal directly.
When using HSA-01, it is in the state which turned OFF the power switch of the shell upper part, and a cartridge
is attached, and the input pin of HSA-01 is connected to the output terminal, it attaches to an arm, needle pressure
is united, and it can be used only by turning ON a power switch.


At the time of head shell attachment, when you turn ON a power switch, please set the volume of a preamplifier
as the minimum. It could be used with almost all arms, since prudence is weight standard as 12.5g and head shell.
In addition, please carry out carefully with reference to an attached instructions manual in the case of battery exchange.
In the case of attachment of a cartridge, when a terminal part is likely to contact a battery holder, please insert the
attached spacer made from the Africa ebony between a cartridge and shell, and prevent contact.

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