Audio Database

SU-A6
Commentary

Based on the technology used in the SU-A2 and SU-A4, this control amplifier offers a high level of saturation of performance and functions.

All stages are class A operation to eliminate switching distortion and crossover distortion.
In addition, all basic circuits are ICL, and a straight DC amplifier is realized in which the Phono input passes through only one coupling capacitor and the high-level input does not pass through any capacitor.

The equalizer amplifier uses a low-noise dual-FET parallel configuration, and MC cartridges can be directly connected.
In addition, gain switching is available for MM cartridges.

Low output impedance design with SEPP buffer amplifier.
As a result, even if a power amplifier with a low input impedance is connected, or even if several power amplifiers are connected, waveform degradation caused by such power amplifiers will not occur.

Equipped with a unique shelving tone.
This shelving tone can be adjusted in four levels : Super Base, Super Treble, Bass, and Treble. It enables effective compensation for actual use without overcompensation.

Equipped with an audio muting switch, subsonic filter and high filter.

Independent selectors for input and rec out allow simultaneous recording of the playback source and other sources.

All input / output terminals are gold-plated.

Model Rating
Type Stereo control amplifier
Input Sensitivity / Impedance
Phono1 MC: 100 μ V/100 Ω
250 μ V/220 Ω
Phono1 MM: 1.0mV/47k Ω
2.5mV/47k Ω
Tuner, AUX, Tape : 150mV/47k Ω
Total harmonic distortion factor
VR max, 3 v output Phono MC (250 μ V) : 0.003%
Phono MM(2.5mV):0.002%
Tuner, AUX, Tape : 0.002%
VR-30dB, 0.5 v output Phono MC (250 μ V) : 0.006%
Phono MM(2.5mV):0.002%
Tuner, AUX, Tape : 0.002%
Signal-to-noise ratio Phono MC (250 μ V) : 74 dB
Phono MM(2.5mV):88dB
Tuner, AUX, Tape (straight DC) : 106 dB
Frequency characteristic
Phono MM: 20 Hz to 20 kHz RIAA ± 0.2 dB
20 Hz to 100 kHz RIAA ± 0.5 dB
Tuner, AUX, Tape : DC ~ 20 khz + 0 -0.1 db
DC ~ 200 khz + 0 -3dB
Maximum Allowable Input (1 kHz, RMS) MC (250 μ V) : 16 mV
MM(2.5mV):160mV
Shelving tone change characteristic Super bass (20 Hz, + 12dB/oct) : 0 dB to + 10 dB
Bass (50 Hz) : + / - 5 dB
Treble (20 kHz) : ± 5 dB
Super treble (50 kHz) : ± 10 dB
Shelving tone turnover frequency Super bass (+ 12dB/oct) : 75 Hz, 150 Hz
bass:500Hz
treble:2kHz
super treble:8kHz
Filter Subsonic : 20 Hz, -12dB/oct.
High : 7 kHz, -6dB/oct.
Loudness control (Volume -30dB) 50Hz:+7dB
Output Level / Impedance
pre out: 2V/2 Ω (Rating)
8V/2 Ω (maximum)
rec out: 150mV/600 Ω
Power supply voltage 100 VAC, 50Hz/60Hz
AC outlet Power switch interlock maximum allowable power : 600W
Power consumption 6W
External dimensions Width 430x Height 97x Depth 360 mm
Weight 5.5kg