Audio Database

The

Technics SU-V6
59,800yen(around the 1980 time)

Description
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The integrated DC Integrated Amplifier which adopted the new class A scheme by a synchro bias circuit original with Technics.

It is an output stage by the side of - which has stopped the amplification action by the new class A amplification scheme when the signal by the side of + enters,Moreover, the fixed bias current was given to the output stage by the side of + to the signal by the side of -, it was not concerned with the presence or absence of a signal, but the output stage was always set to the active state, and switching distortion is banished by considering a transistor as a non cut-off.
Furthermore, since the high-speed response diode which an output transistor saves the always suitable operating point, and switches a wave since the signal path and the bias current have been independent has the synthetic transfer characteristics near the square-law characteristics of an ideal, crossover distortion has also been canceled.

DC amplifier has adopted straight the straight DC scheme which amplifies a signal from a high-level input or subsequent ones. This realizes the faithful waveform-transmission property to a direct-current region, and the swing and the phase frequency characteristic of the audio frequency band are made still the flat.

The Dual FET of the one chip which was excellent in especially the temperature characteristic is adopted as the first stage of a main amplifier.
By -10 degree-C-+50 degree C normal operation, DC drift is also set to }10mV or less, and is suppressed on the conventional about 1-/5& relative-minimum level.

The differential amplifier by a low-noise Dual FET is adopted as the phone equalizer circuitry first rank.
Since man month-MC is made into the interrupt-control-logic equalizer which banished the input capacitor by adoption of Since man month-MC is made into the interrupt-control-logic equalizer which banished the input capacitor by adoption of FET,When an operational mode is set to straight DC, simple circuitry called one coupling capacitor (output capacitor of an equalizer) is realized from a phone input before a speaker termination.
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High gain IC (100dB or more) is adopted as the phone equalizer following stage, and the man-month right-and-left MC gain system for change-over is conjointly realized with adoption of FET of a very low noise. Thereby, MC cartridge can use it direct.

The concentrated power block which suppresses the distorted occurrence by electromagnetic induction is adopted.
By adoption of this block, a power-source part and an output transistor are unified, it connects with the shortest distance, and the distortion of the high region by electromagnetic waves is suppressed on the minimum level.

Right-and-left standalone version 2 power source which achieved right-and-left both channel independency of a rectification and the smoothing circuit is adopted.
The highly efficient transformer which the power transformer also made the coil float in a special resin, and stored it to the shielding case is adopted, and there is little harmful equipment oscillation and it serves as a high transformer of the shielding effect.

FET is adopted as the load intensity of the error detector of a constant-voltage regulated power supply, and the stable voltage with a high ripple (alternating-current component) elimination factor leading to a harmful hum noise is supplied to the voltage amplification stage to the main-amplifier first rank.

If a load impedance is set to 2.2ohms or less, the load-intensity detection type protection network which suppresses the electric current which flows into power IC will be adopted. Furthermore, if DC component beyond }3V comes out, DC detection type protection network which a relay works and separates a speaker is carried.
If a cause is canceled, the auto return of both the circuitries will be carried out to a normal operation.

Leading about of a product line was minimum-ized and the remote action switchpoint which suppresses a property failure is adopted as a Rec selector, an input selector, and a phone selector.

The type by which a defeet is carried out at the middle point is adopted as a tone control.

Power Using

Rating of a mode
Form Integrated DC amplifier
<Tuner, the Aux->SP out overall characteristic>
Effective output (20Hz - 20kHz) 70W+70W (8 ohms, 0.007%)
THD 0.005% (Output-power-3dB, 20Hz - 20kHz)
Power bandwidth (THD 0.02%) 5Hz - 100kHz
Frequency characteristic (straight DC) 20Hz-20kHz+0 -0.1 dB
DC-150kHz+0 -3dB
SN ratio (IHF-A, straight DC) 106dB
Remains noise (straight DC) 450 microvolts
Dumping factor (8ohms) 60
Load impedance main or remote: 4ohms - 16ohms
main and remote: 8ohms - 16ohms
<Other properties>
Input sensitivity/impedance Phono man month: 2.5mV / 47kohm
Phono MC: 170 microvolts/47 ohms
Tuner, Aux, Tape:150mV /, 47kohm
SN ratio (IHF-A) MM:86dB
MC: 68dB (250-microvolt input)
Frequency characteristic 20Hz - 20kHz, RIAA}0.5dB
Tone control Bass: }10dB (50Hz)
Treble: }10dB (20kHz)
Subsonic Filter 20Hz-12dB / oct
A high filter 7kHz-6dB / oct
Loudness control + 7dB (50Hz, Volume-30dB)
<Synthesis>
Power source AC100V, 50Hz/60Hz
Power consumption 182W
Dimensions Width 430x height 153x depth of 351mm
Weight 12.3kg