Audio Database

The

MICRO MR-711 71,000yen(around the 1973 time)

Description
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The record player which adopted the direct-drive scheme.

The direct-drive scheme using the DC servo motor by an electronic-circuitry control system is adopted as a drive system.
A turntable is a product made from aluminum die-casting, and the large inertia moment is taken with 260 kg/cm, and also the bearing precision has adopted what has }2/1000 highmm, }1/1000mm or less of roundness, and precision.

33 The meter scheme of electronic-circuitry adoption is adopted as 1 / 3 or 45rpm velocity checking. The zero point adjustment on this meter is proofread so that it may be in agreement with a constant-speed degree rotation of a motor using a frequency counter, and it is pursuing the accuracy more.
Moreover, 33 1 / speed control organization in which 3 or 45rpm became independent, respectively is carried, and }6% of fine tune is possible to a convention velocity.

Static balance type MA-202L is carried in the tone arm.
This tone arm has obtained the sensitivity which was combining the very precise Ain Guller type bearing and the pivot original with micro in the rotation partial bearing, and was excellent in it. Moreover, it finishes with the pipe quality of the material, and a low-pass vibration and local resonance are stopped by the using of the damping material etc. in consideration of the precision. The height coordination serves as a one-touch lever type within the limits of 6mm.

The shock at the time of a contact of a record and the needle point is prevented by latency operation of an oil dumping type arm lifter. Moreover, the inside-force-canceller organization original with micro is carried.

M-7000/e of man-month type cartridge are carried in the cartridge.
This cartridge supports compact-disk-4 by exchanging the needle point.

Focusing on a 1mm punching metal, the cabinet is using the sole plate about 10mm thick, and is suppressing the vibration by acoustic feedback. Moreover, the aluminum die-casting panel is used for finish.
Furthermore, the possible rubber vibration insulator foot of a height coordination is adopted for the measure against a howling.

The revolving front door which served as the part TAP box is prepared.

The DIN connector is adopted as an output connector.

Front
Internal
The
Insulator Cabinet
M-7000 The

Rating of a mode
Form Record player
<Turntable part>
Drive system Direct-drive scheme
Motor DC servo motor
Rotational frequency 33 1 / 3 or 45rpm
Turntable The product made from 31cm aluminum die-casting, 2.0kg
Rotation unevenness 0.04% or less
S/N ratio 58dB or more
<Tone arm part>
Form A static balance type, MA-202
Effective length 252mm
Overhang 15mm
Offset angle 21 degrees
The maximum tracking error 1.5 degrees or less
Conformity cartridge self-weight 4g-16g (with an additional wait 9g - 21g)
Stylus-force variable span 0-3g
<Cartridge part>
Form man-month type (M-7000/e)
Frequency characteristic span 5Hz - 45kHz
Output balance }0.5dB (1kHz)
Channel separation 30dB(1kHz)
Output voltage 3.5mV (1kHz, 3.54 cm/s)
Load resistance 45kohms - 50kohm
The optimal stylus force 1.5g
Needle point 0.3x0.8mil ellipse diamond needle
Compliance 30x10 to 6 cm/dyne
Self-weight 5g
Switching needle V-7000/e(5,900yen)
V-7000/F (the object for compact-disk-4, 9,000yen)
<Synthesis>
Power consumption 10W
Dimensions Width 498x height 171x depth of 422mm
Weight 13kg