Technics SU-V3
A New Class A integrated DC amplifier from Technics’ SU-V series, noted for low distortion and clean signal path design.
Overview
The Technics SU-V3 is a stereo integrated DC amplifier introduced as part of the SU-V series. It features a "New Class A" amplifier design with a linear feedback circuit aimed at minimizing distortion. The unit includes tone controls with defeat switches, input selectors using remote-action switches to reduce crosstalk, and built-in high and subsonic filters. It was priced at ¥49,800 around 1981.
Specifications
| Amplifier Type | New Class A |
| Power Output (8Ω) | 40 or 55 watts per channel (conflicting sources) |
| Frequency Response | 20 Hz ~ 20 kHz +0 -0.2 dB |
| Total Harmonic Distortion | 0.007% or 0.03% (conflicting sources) |
| Signal-to-Noise Ratio (IHF-A) | Phono MM: 82dB; Tuner/Aux/Tape: 100dB |
| Input Sensitivity / Impedance | Phono MM: 2.5mV/47kΩ; Tuner/Aux/Tape: 150mV/22kΩ |
| Tone Control Range | Bass: ±10dB (50Hz); Treble: ±10dB (20kHz) |
| Subsonic Filter | 30 Hz, -6dB/oct |
| High Filter | 7 kHz, -6dB/oct |
| Loudness Control | +9 dB (50Hz, Volume -30dB) |
| Damping Factor | 40 (8Ω) |
| Residual Noise | 0.5mV |
| Power Consumption | 83W |
| Power Supply | 100 VAC, 50Hz/60Hz |
| Dimensions (W×H×D) | 430 × 97 × 310 mm |
| Weight | 6.0 kg |
Design
The SU-V3 uses a linear feedback circuit designed to achieve theoretical zero distortion and features a synchronous bias circuit unique to Technics that eliminates switching distortion. It incorporates a concentrated power block to minimize electromagnetic interference and a pure electronic protection circuit. The tone control circuit leverages the linear feedback design and includes a mid-point defeat with a dedicated switch. Input and record output selectors use remote-action switches to reduce cable runs and improve crosstalk and signal-to-noise ratio.
Market
The SU-V3 has appeared in recent sales for as little as £45, indicating availability on the secondhand market. Forum discussions frequently address repairs and recapping, suggesting that capacitor replacement is a common maintenance consideration for units after decades of use.
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