VICTOR/JVC AX-S550
¥ 43,800 (released in 1989)
Commentary
Pre-main amplifier with opto-super A circuit.
Uses Opto-Super A, which was developed to efficiently realize the sound of class A operation.
This is a method of realizing class A operation by varying the bias current according to the magnitude of the input signal. Moreover, optical transmission is employed in the circuit for controlling the bias current to eliminate noise interference and to achieve linear control with high-speed transmission.
This Opto-Super A realizes pure A-class operation and high power without switching or crossover distortion.
The power supply section is equipped with a large power transformer to support class A amplification.
In addition, in order to eliminate vibration, a power transformer is mounted on the chassis frame via a 1.6 mm thick base, taking into consideration vibration that adversely affects sound.
For the driver stage of the power amplifier section, a Gm driver which is resistant to impedance fluctuation is used. The output circuit is parallel push-pull, and four high power transistors of Pc100W are used for one channel.
It is equipped with a CD direct switch that connects the CD input signal directly to the power amplifier section through the shortest path, preventing sound quality degradation due to transmission loss.
In addition, a tone circuit is incorporated in the power amplifier section to eliminate redundant amplifiers.
The power cord uses extremely thick OFC wires and is designed to be directly connected to a transformer without using a printed circuit board.
In addition, thick wiring is carefully selected for areas that affect sound quality. In addition, a copper foil shield is provided on the circuit board to eliminate interference from the left and right channels and noise interference from the rectifier diode, and a heat sink noise stopper is also provided.
Equipped with a Rec selector, it is possible to record on the reverse side.
Also, by connecting a graphic equalizer, you can record sound while checking the sound quality correction.
Equipped with a 2-system bi-wired speaker terminal.
Equipped with MC/MM compatible phono equalizer amplifier.
Gold plated terminals are used for CD and Phono input terminals.
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Model Rating
| Type | Integrated amplifier |
| Rated output | 100W + 100W (6 Ω, Distortion factor 0.02%) 80W + 80W (8 Ω, 0.01% distortion factor) |
| Dynamic Power | 225W + 225W (2 Ω) 190W + 190W (4 Ω) 140W + 140W (6 Ω) 110W + 110W (8 Ω) |
| Total harmonic distortion factor | 0.007% (8 ω, 20 Hz-20 kHz, 75W + 75W, CD) 0.003% (6 ω, 1 khz, 105W + 105W, CD) |
| Cross modulation distortion factor | 0.007% (8 Ω, 60 Hz : 7 khz = 4 : 1, at rated output) |
| Output bandwidth | 5 Hz ~ 50 kHz (8 Ω, Distortion Factor 0.05%) |
| Frequency characteristic | 5 Hz ~ 50 kHz + 0 -3dB (8 Ω) |
| Damping factor | 90 (8 Ω, 20 Hz to 20 kHz) |
| Input sensitivity / impedance (at rated output) | Phono MM : 2.5mV/47k Ω Phono MC : 200 μ V/100 Ω CD, Tuner, AUX, Tape1, 2 : 200mV/43k Ω |
| SN ratio (EIAJ/IHF short circuit) | Phono MM:77dB/85dB Phono MC:73dB/66dB CD, Tuner, AUX, Tape1, 2 : 77dB/104dB |
| Phono maximum allowable input (0.02%) | MM:100mV MC:8mV |
| PhonoRIAA Deviation (20 Hz to 20 kHz) | MM : + / - 0.3 dB MC : + / - 0.5 dB |
| Tone control | 100 Hz : + / - 8 dB 10 kHz : ± 8 dB |
| Loudness (Volume-30dB) | 100Hz:+6dB |
| Power supply voltage | 100 VAC, 50Hz/60Hz |
| Power outlet | Power switch interlock : 2 systems (total maximum 100W) Power switch not linked : 1 system (maximum 100W) |
| Power consumption | 155W (Electrical Appliance and Material Control Law) |
| External dimensions | Width 435x Height 147x Depth 348 mm |
| Weight | 9.3kg |