Technics SU-V7X (1984–1985)
A high-performance integrated amplifier from the Technics SU-V series, built around Class A and computer-driven circuitry.
Overview
The Technics SU-V7X is a stereo integrated amplifier made from 1984 to 1985 by Technics, a brand of Panasonic. It was engineered as a cost-effective alternative based on the SU-V10X platform while keeping high fidelity. It has both phono (MM and MC) and video inputs, which is rare for an amplifier in its class. It supports independent recording source selection and has front-panel audio/video inputs.
Specifications
| Effective output (20 Hz to 20 kHz) | 120W + 120W (6 ohm, 0.005%); 100W + 100W (8 ohm) |
| Total harmonic distortion factor | 0.002% – 0.003% (Rated Output -3dB, 20 Hz to 20 kHz) |
| Frequency characteristic | 20 Hz ~ 20 kHz + 0 -0.1 dB |
| Frequency characteristic | 0.5 Hz ~ 170 kHz + 0 -3dB |
| Signal-to-noise ratio | 110dB (IHF-A) |
| Damping factor | 80 (8 Ω) |
| Load impedance Main or remote | 4 Ω ~ 16 Ω |
| Load impedance Main and remote | 8 Ω ~ 16 Ω |
| Input Sensitivity / Impedance Phono MM | 2.5mV / 47k Ω |
| Input Sensitivity / Impedance Phono MC | 170 μV / 220 Ω |
| Input Sensitivity / Impedance Tuner, Aux, Tape | 150mV / 18k Ω |
| Phono SN ratio MM | 88 dB (2.5 mV input) |
| Phono SN ratio MC | 72 dB (250 μV Input) |
| Phono frequency characteristics | 20 Hz to 20 kHz, RIAA ± 0.2 dB |
| Tone control Bass | ± 10 dB (50 Hz) |
| Tone control Treble | ± 10 dB (20 kHz) |
| Turnover frequency Bass | 250 Hz, 500 Hz |
| Turnover frequency Treble | 2 kHz, 4 kHz |
| Loudness control (VR-30dB) | +9dB (50Hz) |
| Power | 100 VAC, 50Hz/60Hz |
| Power consumption | 193W |
| External dimensions | Width 430 x Height 142 x Depth 385 mm |
| Weight | 10.6kg |
Design
The SU-V7X uses Technics' Computer Drive New Class A technology. A microcomputer-controlled system eliminates transient distortion in real time, while a bias circuit independent of the signal system eliminates switching and crossover distortion. The pre-drive stage uses a high-performance operational amplifier for gain control, and an independent bias circuit isolates the signal path. A concentrated power block combines the output stage and power supply to reduce high-frequency electromagnetic distortion. The power transformer uses oxygen-free copper with a high-density winding technique, and low-ESR capacitors keep the power clean. The phono stage is based on MC design principles. The tone control has two-stage turnover switching.
Context
The SU-V7X is part of the Technics SU-V series, which also includes the SU-V1X, SU-V2X, SU-V4X, and SU-V6X. It was developed as a cost-performance alternative derived from the SU-V10X platform, with advanced circuitry in a more accessible package.
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