Technics SU-V3
¥ 49,800 (around 1981)
Commentary
New Class A integrated amplifier with linear feedback circuit.
It is equipped with a linear feedback circuit that realizes theoretical distortion = 0. This circuit forms an independent feedback circuit that enables infinite amplification in the NFB loop. It theoretically realizes an amplifier that performs ideal operation with theoretical distortion = 0, pure gain without influence of elements or power supply, and speaker drive without influence of back electromotive force or wire.
Switching distortion is eliminated by a synchronous bias circuit unique to Technics.
In order to obtain high efficiency, the output stage is always kept active by supplying a constant bias in synchronization with the pause cycle to each of the + side and - side output transistors which are alternately paused in the class B and class AB operation. This eliminates switching distortion caused by the pause of the output stage.
In addition, since the signal path and bias current path are independent, the output stage can always maintain an appropriate operating point. Together with the function of a fast response diode with ideal square characteristics, crossover distortion is eliminated.
It uses a concentrated power block that virtually eliminates the influence of electromagnetic radiation.
This block integrates the output stage and power supply to minimize distortion in the high-frequency range caused by electromagnetic waves.
The tone control circuit is designed to take advantage of the linear feedback circuit.
The tone control is a mid-point defeat, but there is also a defeat switch.
The Input and Rec out selector switches employ remote action switches that eliminate the unnecessary wiring of cables, thereby improving various characteristics such as crosstalk and SN ratio.
Equipped with a pure electronic protection circuit.
Equipped with high filter and subsonic filter.
Model Rating
| Type | Integrated amplifier |
| <Overall characteristics of Tuner, Aux → SP out> | |
| Effective output (20 Hz to 20 kHz) | 40W + 40W (8 Ω, 0.007%) |
| Total harmonic distortion factor | 0.007% (Rated Output -3dB, 20 hz to 20 khz) |
| Output Bandwidth (THD 0.02%) | 5 Hz ~ 40 kHz (8 Ω) |
| TIM | Unmeasurable |
| Residual noise | 0.5mV |
| Damping factor (8 Ω) | 40 |
| Load impedance | Main or remote : 8 Ω ~ 16 Ω |
| <Other characteristics> | |
| Input Sensitivity / Impedance | Phono MM : 2.5mV/47k Ω Tuner, Aux, Tape : 150mV/22k Ω |
| Phono frequency characteristics | 20 Hz to 20 kHz, RIAA ± 0.8 dB |
| Frequency characteristic | 20 Hz ~ 20 kHz + 0 -0.2 dB 2 Hz ~ 100 kHz + 0 -3dB |
| Signal-to-noise ratio (IHF-A) | Phono MM:82dB Tuner, Aux, Tape : 100 dB |
| Tone control | Bass : ± 10 dB (50 Hz) Treble : ± 10 dB (20 kHz) |
| Subsonic filter | 30 Hz, -6dB/oct. |
| High filter | 7 kHz, -6dB/oct. |
| Loudness control | + 9 dB (50 Hz, Volume -30dB) |
| <General> | |
| Pwer | 100 VAC, 50Hz/60Hz |
| Power consumption | 83W |
| External dimensions | Width 430x Height 97x Depth 310 mm |
| Weight | 6.0kg |