Sansui BA-60 (1968)
A solid-state stereo power amplifier released by Sansui Electric in July 1968, built for high-fidelity audio systems.
Overview
The Sansui BA-60 is a stereo power amplifier made by Sansui Electric Company Limited and released in July 1968. Sansui called it a "solid-state basic amplifier." It pairs with other components, such as the CD-5 electronic crossover unit, and can run alongside the BA-90, AU-777, or AU-555 amplifiers in multi-unit setups. It puts out 25W per channel into 4Ω. The left and right channels each get their own volume and phase controls.
Specifications
| Effective power (4 Ω) | 25W/25W ± 1 dB |
| Effective power (8 Ω) | 20W/20W ± 1 dB |
| Music Power IHF (4 Ω) | 60W ± 1 dB |
| Music Power IHF (8 Ω) | 50W ± 1 dB |
| Harmonic distortion factor | 0.3% or Less (at Rated Output) |
| Intermodulation distortion factor (60 hz : 7 khz = 4 : 1) | 0.3% or less |
| Power Bandwidth IHF (8 Ω) | 20 Hz ~ 40 kHz |
| Frequency Characteristics (Normal Output, 8 Ω) | 20 Hz ~ 60 kHz ± 1 dB |
| Input Sensitivity (1 kHz, Effective Output) | 0.7 V ± 3 dB |
| Input impedance | 50k Ω or more |
| Load impedance | 4 Ω ~ 16 Ω |
| Damping factor | 46 (8 Ω) |
| Hum and noise (IHF) | 80 dB or more |
| Channel separation | 50 dB or more |
| Power supply voltage | AC100V/117V/220V/240V, 50Hz/60Hz |
| Power consumption | 100VA |
| External dimensions | Width 152 x Height 111 x Depth 264 mm |
| Weight | 4.2kg |
Design
The circuit is a SEPPP OTL-ITL design with silicon transistors. A circuit breaker protects the power transistors. Besides the independent left and right volume controls and the phase changeover switches, there is an oral/null balance switch for adjusting left/right balance. An input level adjuster lets it work with a range of preamps.
Context
The BA-60 can be used with the SANSUI CD-5 electronic crossover unit. The BA-90, AU-777, and AU-555 amplifiers are mentioned alongside it as compatible components in expanded audio systems.
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