Technics SU-V6X (1983–1986)
A solid-state integrated DC amplifier with computer-driven bias control, released by Technics in 1983.
Overview
The Technics SU-V6X is a stereo integrated DC amplifier. It was produced from 1984 to 1986 and originally priced at ¥69,800 when it debuted in 1983. It belongs to the SU-V series, alongside the SU-V1X, SU-V2X, SU-V4X, and SU-V7X. Technics gave it its own power linear circuit, which combines advanced NFB (negative feedback) theory with a synchronous bias circuit for better linearity and performance.
Specifications
| Power output | 120W + 120W (6 ohm, 0.005%) |
| Total harmonic distortion factor | 0.002% (Rated Output -3dB, 20 Hz to 20 kHz) |
| Output Bandwidth (THD 0.02%) | 5 Hz to 100 kHz |
| Frequency characteristic | 20 Hz ~ 20 kHz +0 -0.1 dB |
| SN ratio (IHF-A, straight DC) | 104 dB |
| Residual Noise (straight DC) | 0.5 mV |
| Damping factor (8 Ω) | 80 |
| Load impedance | Main or remote : 4 Ω ~ 16 Ω |
| Input Sensitivity / Impedance | Phono MM : 2.5 mV / 47 kΩ |
| Input Sensitivity / Impedance | Phono MC : 170 μV / 220 Ω |
| Input Sensitivity / Impedance | Tuner, Aux, Tape : 150 mV / 18 kΩ |
| Phono SN ratio | MM : 88 dB (2.5 mV input), MC : 72 dB (250 μV input) |
| Phono frequency characteristics | 20 Hz to 20 kHz, RIAA ± 0.5 dB |
| Shelving tone | Bass : ±10 dB (50 Hz), Treble : ±10 dB (20 kHz) |
| Filter | Subsonic : 30 Hz, -6 dB/oct. |
| Loudness control | +9 dB (50 Hz, Volume -30 dB) |
| Power | 100 VAC, 50 Hz / 60 Hz |
| Power consumption | 580 W |
| External dimensions | Width 430 × Height 141.6 × Depth 380 mm |
| Weight | 10.7 kg |
Design
The SU-V6X runs a computer-driven class A amplification system. It was the first in the world to use a microcomputer to control amplifier bias. The proprietary power linear circuit is built on enhanced linear feedback and NFB loop design, which gives high linearity and low distortion. A synchronous bias circuit keeps operation stable. The power supply uses a low-loss, high-capacity transformer and low-ESR capacitors. The phono stage uses ultra-low noise FETs. The tone control circuit uses main NF (bass) and NF-CR (treble) types for high SN ratio and minimal distortion. Rear-panel terminals allow external devices like graphic equalizers.
Market
Service manuals are available for the SU-V6X. Units turn up on the used market in varying condition, from operational examples to ones sold for parts or restoration. Online forums still carry inquiries about its performance and reliability.
Similar items on eBay
No exact Technics SU V6X listings are live right now — these searches show current Technics and similar vintage audio gear on eBay:
As an eBay Partner, we earn from qualifying purchases. This helps support our independent vintage technology research.