Technics SU V40 (1986–1987)
A class AA integrated amplifier from Technics’ SU-V series, produced in the mid-1980s with high-fidelity specifications and a robust power supply design.
Overview
The Technics SU-V40 is a stereo integrated amplifier manufactured by Technics, a brand of Matsushita Electric Industrial Co., from 1986 to 1987. It belongs to the SU-V series of amplifiers and shares design lineage with models like the SU-V50, SU-500, and SU-700. This unit combines a preamplifier and main amplifier in one chassis, utilizing Technics' proprietary class AA technology for low distortion and dynamic speaker control.
Specifications
| Effective output (20 Hz to 20 kHz) | 60W + 60W (6 Ω, 0.005%) |
| Total harmonic distortion factor | 0.003% (Rated Output -3dB, 20 Hz to 20 kHz) |
| Frequency characteristic | 20 Hz ~ 20 kHz +0 -0.2 dB; 5 Hz ~ 120 kHz +0 -3 dB |
| Signal-to-noise ratio | 100dB (IHF'66) |
| Damping factor | 60 (8 Ω) |
| Load impedance | Main or remote: 6 Ω ~ 16 Ω; Main and remote: 12 Ω ~ 16 Ω |
| Input Sensitivity / Impedance | Phono MM: 2.5mV/47k Ω; Tuner, Aux, Tape: 150mV/22k Ω |
| Phono SN ratio | MM: 81 dB (2.5 mV input) |
| Phono frequency characteristics | 30 Hz to 15 kHz, RIAA ± 0.8 dB |
| Tone control | Bass: ±10 dB (50 Hz); Treble: ±10 dB (20 kHz) |
| Loudness control (VR-30dB) | +9dB (50Hz) |
| Power | 100 VAC, 50Hz/60Hz |
| Power consumption | 125W |
| External dimensions | Width 430 × Height 97 × Depth 290 mm |
| Weight | 6.3kg |
| Original price | ¥46,800 (around 1986) |
Design
The SU-V40 uses a pre-main amplifier design with Technics' class AA technology, combining a pure class A voltage-controlled amplifier free from switching and crossover distortion with a current-driven amplifier for dynamic speaker drive. The power supply features a large transformer and capacitor bank capable of 300A instantaneous current delivery, integrated into a concentrated power block for optimized performance. A large metal insulator reduces vibration effects, while features like the Route 6 input jack with source indicator and CD direct function enhance usability.
Context
The Technics SU-V40 is part of the Technics SU-V series of integrated amplifiers and is listed alongside the SU-V50 as a contemporary model. It shares product family ties with the SU-500 and SU-700, indicating a broader lineup of mid-to-high-end amplifiers during this period.
Market
Common issues include faulty power buttons, speaker protection failures, and transistor failures leading to no sound output. Repair documentation exists for servicing the unit. Current market prices range from $169.00 for serviced units to $399.99–$549.99 for used units in regular or sale pricing.
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