Sansui BA 7000 (1978–1980)
Flagship dual-mono power amplifier from Sansui’s X-balanced series, delivering 200W per channel with precision and authority.
Overview
The Sansui BA 7000 is the top-tier power amplifier in Sansui Electric Co., Ltd.'s X-balanced series, produced from 1978 to 1980. Designed as a high-power, high-fidelity component, it competes with elite amplifiers of the era from brands like McIntosh and Pioneer. Built with dual mono architecture and discrete circuitry, it emphasizes stability, neutrality, and dynamic control across demanding speaker loads.
Specifications
| Year of Production | 1978-1980 |
| Power Output | 200 watts per channel into 8Ω, 300 watts per channel into 4Ω |
| Impedance | 4Ω to 16Ω |
| Sensitivity | 1.2V for rated output |
| Total Harmonic Distortion | 0.03% |
| Signal-to-Noise Ratio | 120 dB |
| Damping Factor | 100 |
| Frequency Response | 10 Hz - 30 kHz (+0dB, -0.5dB) |
| Dimensions (W×H×D) | 480 × 190 × 430 mm |
| Weight | 34.5 kg |
Design
Features dual mono construction with a massive toroidal transformer, fully discrete circuitry, and a DC servo amplifier design. Includes dual power meters, balanced XLR inputs, a speaker protection relay, and large heat sinks for thermal stability.
Context
Part of Sansui's "X-balanced" series, which includes the BA-5000 and integrated amplifiers like the AU-X1. Represents the peak of Sansui's engineering in the late 1970s, designed to deliver reference-level performance in high-end audio systems.
Sound Signature
Exceptionally clean, powerful, and neutral with excellent control over speakers. Delivers tight, deep bass response, detailed midrange, and extended highs. Known for its authority and dynamic capability without coloration.
Market
Current market value ranges from $1,500 to $3,000 depending on condition and restoration status. Common maintenance needs include replacing aging capacitors in power supply and protection circuits, refreshing original thermal paste, replacing meter backlight bulbs, and cleaning oxidized speaker relay contacts. Its 34.5 kg weight demands careful handling during transport or installation.
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