SANSUI SAX-1000 (c. 1965)
A tube-powered command center from Sansui's golden era, where FM tuners had ferrite antennas and MC cartridges needed their own transformers.
Overview
It weighs 20.3 kilograms and the chassis is 454 mm wide. The SANSUI SAX-1000 was announced as a top-of-the-line model, built to chase sonic perfection, and the specifications are almost obsessive today. It was part of an "impressive group of products" in the early 1960s aimed at world-class performance.
This is a tube lover's machine. Twenty-one vacuum tubes, including the GT 7591 in a fixed-bias push-pull configuration, drive the power amp section, paired with an ultra-wide-band output transformer that promises extended response and tight control. Power is rated at 96W music power (IHF), which was no joke for the time. The damping factor is 9.5 (1kHz). Solid-state purists won't be impressed today, but for a tube design from 1965 it suggests an effort to rein in speaker resonance without sacrificing warmth.
It is also a full integrated amplifier with an FM/AM tuner section. The FM tuner uses a cascode system with two-stage New Vista and a three-stage variable capacitor, plus RF-first-stage amplification and a built-in ferrite antenna. It has a double limiter for noise, an AFC circuit, muting, stereo indicator, tuning meter, and an SCA filter to block subcarrier interference. The AM section is less flashy, but it still includes a bar antenna and tuning meter, with image rejection of 65dB at 1,000kHz.
The input side is flexible for its era. Eight input systems and three route terminals mean you could run multiple sources without constant patching. Two phono inputs are provided. One of them can handle MC cartridges down to 0.06 mV when paired with the optional Sansui A-604 input transformer, plugged into the MT9P socket. Sansui built in the infrastructure for moving-coil cartridges, which was rare in mass-market receivers of the time.
A center channel output (7.5V/1kΩ) makes it compatible with 3D stereo setups. Add in tape monitoring, a headphone jack, and tone controls including loudness, presence (250 Hz turnover), and switchable high- and low-cut filters, and it is as much a studio console as a home receiver.
Specifications
| Manufacturer | Sansui Electric Co., Ltd. |
| Product type | High-grade stereo comprehensive amplifier; Integrated amplifier |
| Music Power (IHF) | 96W |
| Effective power | 38W/38W (when using one channel); 33W + 33W (when both channels are used) |
| Harmonic distortion factor (at rated output) | 1% |
| Power Band Width (IHF) | 35 Hz to 15 kHz |
| Frequency characteristic Aux | 30 Hz to 20 kHz ± 1.5 dB (at normal output) |
| Channel separation Phono | 55dB |
| Hum and Noise (IHF) Aux | -90dB at rated output |
| Hum and Noise (IHF) Phono | -70dB at rated output |
| Residual Noise (Tone Control Flat) | 1 mv (8 Ω) |
| Load impedance | 8 Ω, 16 Ω |
| Damping factor | 9.5(1kHz) |
| Input sensitivity Phono 1 | 2 mV (0.06 mV when using Sansui input transformer A-604) |
| Input sensitivity Phono 2 | 2mV |
| Input sensitivity Tape head | 2mV |
| Input sensitivity Mic | 2.3mV |
| Input sensitivity Aux 1 | 65mV |
| Input sensitivity Aux2 | 110 mV |
| Input sensitivity Tape mon (Pin) | 65mV/200k Ω |
| Input sensitivity Tape mon (Din) | 65mV/100k Ω |
| Center channel output | 7.5V/1k Ω (at rated output) |
| Equalizer characteristics Phono MAG | RIAA |
| Equalizer characteristics Tape head | NAB(19cm/sec) |
| Tone control Bass | + 10 dB ~ -15dB (50 Hz) |
| Tone control Treble | + 11 dB ~ -12dB (10 kHz) |
| Loudness control | + 7.5 dB (50 Hz), + 7.5 dB (10 kHz) |
| High-cut filter | 10 kHz, -11dB/oct |
| Low-cut filter | 50 Hz, -10dB/oct |
| Presence | 250 Hz (turnover frequency) |
| Other Functions | Tape monitor; Headphone jack |
| FM Tuner Section Receiving frequency | 76 MHz to 90 MHz |
| FM Tuner Section Sensitivity | 1.8 μ V (S/N20dB, Mod30%); 2 μ V (S/N30dB, Mod30%) |
| FM Tuner Section IF bandwidth | 230kHz(-3dB) |
| FM Tuner Section Image ratio | 52dB(S/N50dB) |
| FM Tuner Section Total harmonic distortion factor | 0.8% (60 dB input, 30% Mod) |
| FM Tuner Section Frequency characteristic | 30 Hz to 15 kHz ± 1 dB |
| FM Multi Section Separation | 38 dB (1 kHz, 60 dB input) |
| FM Multi Section Total harmonic distortion factor | 1.2% (60 dB input, 30% Mod) |
| FM Multi Section Frequency characteristic | 50 Hz to 15 kHz ± 1.5 dB |
| FM tuner unit included function | FM-AFC; Muting; Stereo indicator; Tuning meter; SCA Filters |
| AM Tuner Section Receiving frequency | 535 kHz to 1,605 kHz |
| AM Tuner Section Sensitivity | 7 μ V (S/N20dB, Mod30%); 3 μ V (S/N10dB, Mod30%) |
| AM Tuner Section Image ratio | 65dB(1,000kHz) |
| AM Tuner Section Selectivity Narrow | 30 dB (± 10 kHz) |
| AM Tuner Section Selectivity Wide | 24 dB (± 10 kHz) |
| Functions attached to AM tuner part | Tuning meter; Bar antenna |
| Used vacuum tubes, etc. | 7591, etc., 21 vacuum tubes, 20 semiconductors |
| Power | 100 VAC / 117 V, 50Hz/60Hz |
| Power consumption | 180 VA (No Load); 280 VA (full load) |
| External dimensions | Width 454x Height 145x Depth 365 mm |
| Weight | 20.3 kg |
Key Features
Tube Power with Precision
The power section is built around the GT 7591 tube in a fixed-bias push-pull configuration. 7591s were known for high power output and linearity in a compact bottle, which suited high-fidelity designs that needed real wattage without a massive chassis. Paired with an ultra-wide-band output transformer, the design aims for extended frequency response and tight control over speaker cones, even if the damping factor of 9.5 at 1kHz suggests a slightly softer grip than modern solid-state amps. The result is likely a warm, dynamic sound with the bloom and texture tubes are famous for.
FM Tuner: A Broadcast Engineer’s Dream
Sansui didn't treat the tuner as an afterthought. The FM section uses a cascode system with two-stage New Vista and a three-stage variable capacitor, which improves gain and stability. RF-first-stage amplification boosts weak signals early, while the five-stage IF amplifier and four-stage limiter deliver stereo separation of 38 dB at 1 kHz and low distortion (0.8% THD). AFC, muting, and an SCA filter point to fringe-area reception and subcarrier interference being handled without trouble.
Phono Flexibility for the MC Enthusiast
In an era when most receivers barely handled moving magnet cartridges, the SAX-1000 went further. Two phono inputs are standard, and the standout is support for moving coil cartridges via the MT9P socket and optional A-604 transformer, dropping sensitivity down to 0.06 mV. The RIAA equalization is standard, but MC playback without external preamps was ahead of its time.
Signal Routing and Sonic Shaping
With eight input systems and three route terminals, the SAX-1000 was built for complex setups. The preamp section uses four transistors to reduce hum and noise. Tone controls are extensive: ±10 to 15 dB of adjustment at 50 Hz and 10 kHz, plus loudness, presence (250 Hz turnover), and switchable high- and low-cut filters. The CR-type tone control network suggests a smooth, musical response rather than surgical EQ. The center channel output hints at experimental 3D stereo use, decades before home theater became mainstream.
Historical Context
The SANSUI SAX-1000 emerged around 1965 as part of an "impressive group of products" that reflected Sansui's ambition to produce world-class stereo amplifiers and receivers. Positioned as a top-of-the-line model, it shared the spotlight with contemporaries like the SAX-200, SAX-300, SAX-600, and AU-70, AU-111 series, part of a push to establish Japanese high-fidelity on the global stage. FM broadcasting was gaining traction and audiophiles were beginning to demand more from their gear.
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