Audio Database

The

Technics SU-C7000 * Build-to-order article
450,000 yen(December, 1992 release)

Description
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Control amplifier which adopted the battery drive power source.

Newly developed battery drive-by-class AA and advanced system are adopted.
By this scheme, by performing the drive by a battery, the signal circuit was completely separated from the AC power source, and the noise loop between the equipments through a power source, the switching noise of a power circuit, etc. are canceled.
The mass small seal lead accumulator currently used for the power source for a backup of a mainframe computer main arithmetic unit is used for a battery with one package, and it is possible in the powering of about 4 hours at a full condensation. Moreover, if the remaining capacity of a battery decreases, it will be detected, and it changes to AC mode rectified automatically, and a condensation of a battery is started simultaneously. If a condensation is completed, it will change to a battery drive again.

The newly developed resistor rotation volume is adopted as a volume.
The structure of being the way of thinking contrary to the conventional volume, fixing a brush and rotating a resistor is used for this volume. Thereby, the heterogeneous alloy-junction part leading to a tone-quality failure is reduced by half. Moreover, special combination of the carbon which fine-particle-ized the tone quality to the resistor influenced greatly is carried out, and distortion is sharply improved because a free electron flows by smooth transmit in carbon particles.
Furthermore, in order to reduce the extraneous vibration which gets across to a brush, it puts into the gilding case of the large zinc die-casting shaving appearance of specific gravity, and the thorough improvement in a tone quality is aimed at.

THCB (Technics Hybrid Construction Base) of multilayer structure is adopted as a chassis structure.
With this structure, the periodic-damping property excellent in facing across a hard rubber base with a copper plating griddle bottom chassis and the chassis of a griddle, and also piling up a copper plating griddle top chassis on it is realized.
Furthermore, the top plate and bulk molding compound of 2.8mm thickness which considered the electromagnetic radiation were used, and the oscillation from outside is prevented with the phi60mm large-sized insulator which stuck wool felt, and the sub- wood of real wood specular surface finish.

In order to cancel the leakage magnetic flux generated by the transformer of the conventional square-shaped cross-section core, R core transformer of a circular section structure is adopted. By this transformer, since the coil is closely wound around the circular core, uniform magnetic flux is formed, and leakage flux and a loss can be reduced.

One balanced type is carried in the input/output terminal, respectively.
This termination has adopted as DL type permalloy core the transformer scheme of the balance volume which stopped the degree of unbalance, and a severe shielding is given and it is performing the stable transmit so that it may not be influenced by an external magnetism.

The newly developed MASTER series high-quality sound large-sized aluminum electrolytic capacitor is adopted as a capacitor.
By this capacitor, the oxidization aluminum formed on the surface of aluminum foil was made into the isolation layer, and the electric charge is taken out not by electronic missions but by ion missions of the electrolytic solution. Furthermore, the mechanical property is also improved by using newly developed special vibration suppression aluminum also for a case.

The balance volume with an ON/OFF switchpoint is carried.

The AC/DC operation circuit changing switch is carried.

The battery voltmeter with an AC/DC/Charge window is carried.

The golden cladding contact relay of nitrogen gas ••Ž~ is adopted as a relay.

The very-thick PC-OCC power cord with a polar window is adopted.


Internal
THCB
THCB construction drawing
(Above)
- Top chassis (copper plating)
- Chassis
- Rubber base
- Bottom chassis (copper plating)
- Foot (bulk-mode compound)
The
R
Resistor
The

Rating of a mode
Form Control amplifier
THD (20Hz - 20kHz) Phono man month (Rec out, EIAJ): 0.001%
Line1/2, compact disk, tape1/2:0.001%
S/N ratio Phono MM:86dB(EIAJ)
88dB(IHF'66)
Line1/2, compact disk, tape of 1/2:97dB (EIAJ)
104dB(IHF'66)
Frequency characteristic Line1/2, compact disk, and tape1/2:20Hz-20kHz+0 -0.1 dB
0.5Hz - 125kHz (+0dB-3dB)
Balance: 30Hz-20kHz}0.3dB
Phono RIAA deflection: 20Hz-20kHz}0.2dB
Output power Pre out: 1V (20Hz - 20kHz, 0.001%)
Maximum permissible input MM:100mV
Power source AC100V, 50Hz/60Hz
Power consumption 32W
Dimensions Width 483x height 134x depth of 375mm
Weight 17.5kg (battery power-source included)
Option Interchangeable battery driving power supply 2212X2 AU (2x12V, 2.2Ah/20HR) of LC-R
(Replacement-parts treatment, build to order, 19,800yen)