SANSUI SU-9500 Integrated Amplifier Flagship

🎶 Sansui Reference-Grade Pre-Main Amplifier

Experience the pinnacle of Sansui engineering — a top-tier pre-main amplifier crafted with precision circuitry, hand-selected components, and uncompromising sonic purity.

🔊 Power & Performance

• True OCL (Output Capacitor-Less) pure complementary-service circuit across all stages.

• Parallel Push-Pull Output Stage delivers high power with ultra-low distortion.

• Total Harmonic Distortion (THD): ≤ 0.1% (5 Hz – 40 kHz) — even from small to full output.

• Intermodulation & Power Distortion: < 0.1%, ensuring pristine clarity at any volume.

• Broadband linearity: stable response from sub-bass to ultrasonic frequencies.

⚡️ Robust Dual Power Supply

• Large-core power transformer with 4× 4700 µF capacitors for immense energy reserves.

• Independent L/R channel power feeds for true channel separation.

• ± Dual-rail power system improves stability and drive authority.

• Dedicated pre-drive and power-stage supplies:

  • Pre-drive runs at higher voltage for unflinching dynamics.

  • Load fluctuations never affect tonal balance or stability.

🎛 Precision Circuit Design

• All-Stage Direct-Coupled Architecture — no coupling capacitors to color the sound.

• Double-stage Differential Amplifier using low-noise transistors and constant-current drive for ideal balance and minimal drift.

• High Phase Margin Design ensures unwavering stability across all loads.

🎚 Equalizer Section

• 3-Stage Direct-Coupled PNP-NPN-PNP Equalizer Circuit with ultra-low noise.

• Maximum Input: 300 mV — handles high-output cartridges effortlessly.

• RIAA Accuracy: ± 0.5 dB (30 Hz – 15 kHz).

• Click-Noise Suppression: -power supply design eliminates pops during switching.

🔐 Protection & Reliability

• Built-in current limiter for driver and output transistors.

• Electronic relay + short-cut fuse safeguard against overloads.

• Relay mute circuit prevents “pop” noise at power-on.

🎨 Exclusive T.T.C. (Triple Tone Control)

• Unique Sansui innovation for ultra-precise tone shaping:

  • Low / High: ± 15 dB in 3 dB steps.

  • Midrange: ± 5 dB in 1 dB steps.

• Selectable tone frequencies:

  • Low: 150 Hz / 300 Hz / 600 Hz

  • Mid: 750 Hz / 1.5 kHz / 3 kHz

  • High: 2 kHz / 3.5 kHz / 6 kHz

• Tone Defeat Switch: engage flat response instantly for purists.

• Low-Noise FET Front Stage: high input impedance, minimal coloration.

🧭 Advanced Filtering

• Active NF-type filter circuits (12 dB/octave).

  • High Filter: 6 kHz / 12 kHz.

  • Low Filter: 25 Hz / 50 Hz.

• No midrange response variation — only precise tonal control.

🎧 Connectivity & Flexibility

• Dual Tape Loops: record & monitor from two decks simultaneously.

• Tape-to-Tape dubbing and real-time monitoring with the Tape Reprint Switch.

• Supports 4-Channel Expansion via adapter connection.

• Noise Reduction (NR) Adapter Ready — dual-deck Hi-Fi recording.

• Phono Inputs:

  • Phono 1 – 50 kΩ

  • Phono 2 – switchable 30 kΩ / 50 kΩ / 100 kΩ (cartridge matching).

• Pre/Main Separation: independent operation or integration via rear connectors.

• Speaker Terminals: A, B, C — combinations A+B or A+C selectable.

• Muting Switch: instant –20 dB attenuation without touching volume.

• Input Level Adjusters: unify Deck 1, 2, and AUX source volumes.

• Dual Headphone Outputs: one auto-mutes speakers when engaged.

• Mic Inputs (L/R): for high-impedance microphones.

• 5-Mode Selector: Stereo Reverse / Normal / Mono / L+R / L / R.

• Loudness Circuit for enhanced low-volume listening.

• DIN Connector for easy tape-deck linking.

• Dual Grounding Terminals.

• 4 AC Outlets: 2 switched + 2 unswitched for full system integration.

🛠 Build Quality

• All knobs milled from solid aluminum for precise tactile control.

• Exemplifies Sansui’s golden-era craftsmanship — engineered for decades of flawless performance and musical transparency.