Sansui AU-11000 (1975)
A high-performance integrated stereo amplifier combining advanced DC-coupled design with precision RIAA equalization and comprehensive signal management
Overview
The Sansui AU-11000 is a stereo integrated amplifier developed by Sansui Electric Co., Ltd., combining decades of audio engineering into a single high-end unit. Released in 1975, it features a fully DC-coupled complimentary OCL design, delivering 110W per channel into 8Ω with exceptionally low distortion. The amplifier was engineered for both power and precision, with independent stage isolation, switchable phono input settings, and an advanced protection system for reliability.
Specifications
| Year of Production | 1975 |
| Power Output | 110W per channel into 8Ω (both channels driven, 20Hz–20kHz) |
| Total Harmonic Distortion | Not more than 0.08% at rated output |
| Intermodulation Distortion (SMPTE) | Not more than 0.08% |
| Frequency Response | 10 Hz to 50 kHz +0, -1dB (at 1W) |
| Damping Factor | 80 (8 Ω) |
| RIAA Deviation (30 Hz to 15 kHz) | ± 0.3 dB |
| Signal to Noise Ratio | 90dB (High-level: 80 dB or higher; Phono: 65 dB or more) |
| Load Impedance | 4 Ω, 8 Ω |
| Channel Separation (1 kHz) | Phono1/2: 55 dB or more; Tuner/Aux/Tape Monitor: 60 dB or more |
| Input Sensitivity / Impedance (1 kHz) | Phono1: 2/4/8 mV / 30/50/100 kΩ; Phono2: 2 mV / 50 kΩ; Tuner, Aux1, 2, Tape Monitor1 : 130mV / 50 kΩ; Tape Monitor2(Pin/Din):130mV |
| Maximum Allowable Input (THD ≤0.1%) | Phono1: 1000 mV (8 mV setting); Phono2: 300 mV; Aux/Tuner: 3 V |
| Output Level | Tape rec1 (Pin): 130 mV; Tape rec2 (Pin/Din): 130 mV / 30 mV |
| Tone Control Range | Bass: ±10 dB (30 Hz); Midrange: ±5 dB (1.5 kHz); Treble: ±10 dB (20 kHz) |
| Tone Selector | Bass turnover: 150 Hz, 300 Hz, 600 Hz; Treble turnover: 2 kHz, 4 kHz, 8 kHz |
| Low Filter | -3dB at 20 Hz (12dB/oct), -3dB at 60 Hz (12dB/oct) |
| High Filter | -3dB at 7 kHz (6dB/oct), -3dB at 12 kHz (12dB/oct) |
| Rated Power Consumption | 240W |
| External Dimensions | 460 mm (W) x 160 mm (H) x 375 mm (D) / 19-1/2" x 6-3/4" x 15-3/4" |
| Weight | 19.3 kg (53.1 lbs) |
Design
All stages are directly coupled in a pure complimentary OCL system, with the power amplifier using a differential first stage and parallel push-pull output stage with matched transistors. The phono equalizer employs a two-amplifier configuration with a differential input using dual transistors, and RIAA correction is split into high and low bands using CR and negative feedback for accuracy into ultra-high frequencies. The unit uses a toroidal power transformer and features a dynamic margin of 300 mV via ±2 high-voltage power supplies. The chassis layout separates preamplifier and tone controls (front) from the power supply and power amp (rear), with complete block stage isolation. It includes switchable phono1 sensitivity and impedance (3 levels), a tone defeat switch, selectable volume offsets (0 dB, -10 dB, -20 dB), two tape monitor circuits, a tape copy switch, low/high filters, tuner priority selector, muting switch, and side input/output terminals. A built-in protection circuit combines thermal detection, DC offset detection via relay, and an ASO (Safe Operating Area) current limiter to safeguard speakers and output transistors.
Context
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