Audio Database

SU-A8
Commentary

A 1U size stereo DC control amplifier with A-class operation in all stages, ICL configuration in all stages, and a presettable electronic selector.

The equalizer circuit is based on the MC high-gain basic design by using a low-noise FET in parallel and combining a cascade connection input for differential amplification with a high-performance operational amplifier.

The tone circuit is also fully DC-integrated flat / tone amplifier, which increases the fidelity of waveform transmission.

Switching distortion and crossover distortion are eliminated by the class A operation of all stages.
In addition, all basic circuits are ICL, forming a straight DC amplifier in which the phono input passes through only one coupling capacitor and the high-gain input does not pass through any capacitor.

An electronic selector is used for the input selector.
The phono and high-level selectors are 2-wei-switchable electronic selectors (MM ⇔ MC, tuner ⇔ aux) that can be used to preset the buttons by pressing down firmly.

It is equipped with sliding volume and touch fader which can fade in and fade out the volume.

Two tape decks can be connected.

Model Rating
Type Stereo DC control amplifier
Input Sensitivity / Impedance Phono MC : 170 μ V/220 Ω
Phono MM : 2.5mV/47k Ω
Tuner, Aux, Tape : 150mV/22k Ω
Total harmonic distortion factor
(20 Hz to 20 kHz, VR-20dB, 2 v output)
Tuner, Aux, Tape, Phono MM : 0.002%
Phono MC:0.01%
Signal-to-noise ratio Tuner, Aux, Tape / Straight DC : 102 dB
Phono MM:88dB(2.5mV)
Phono MC : 73 dB (250 μ V)
Frequency characteristic Phono MM : 20 Hz to 20 kHz, RIAA ± 0.2 dB
Phono MC : 20 Hz to 20 kHz, RIAA ± 0.5 dB
Tuner, Aux, Tape : DC ~ 20 khz + 0 -0.2 db
DC ~ 100 kHz + 0 -3dB
Maximum Allowable Input (1 kHz, RMS) Phono MM:160mV
Phono MC:11mV
Tone control Bass : ± 10 dB (50 Hz)
Treble : ± 10 dB (20 kHz)
Filter Subsonic : 20 Hz, -12dB/oct.
Loudness control (VR-30dB) +9dB(50Hz)
Output Voltage / Impedance Pre-out : 1V/2 Ω (Rating), 10V/2 Ω (Maximum)
Rec out:150mV
Pwer 100 VAC, 50Hz/60Hz
Power consumption 14W
External dimensions Width 430x Height 53x Depth 365 mm
Weight 4.5kg