SONY TA-AX70
¥ 75,000 (released in 1982)
Commentary
This pre-main amplifier is equipped with an audio current transfer system with an emphasis on the characteristics in actual use.
The preamp section, power amplifier section, and left and right channels are electrically independent of each other using the audio current transfer method, which improves the dynamic range and separation characteristics in actual use.
The power amplifier uses a Regart-Linear system that operates a Hi-ft transistor in the minimum cut-off region. This improves the slew rate and rise time and reduces switching and crossover distortion.
The volume controller uses a linear gain controller, which improves the acoustic characteristics at the actual sound level.
A constant current shunt regulator is used in the power supply for the pre-section to suppress the mutual interference between the power supply for the pre-section and the power supply for the power section.
High-quality components such as large-capacity condensers are introduced to further improve sound quality.
The chassis uses copper-tight (copper-plated) cases to eliminate magnetic materials from the components as much as possible.
Equipped with MM/MC (40 Ω, 3 Ω) cartridge load selector.
Equipped with a Rec out selector.
Uses a oxygen-free copper power cord with polarity indication.
Equipped with Direct/on-switchable tone control.
Equipped with a subsonic filter.
The phono terminal is gold-plated.
Model Rating
| Type | Pre-main amplifier |
| Output | 75W + 75W (20 Hz to 20 kHz, both channels, 8 Ω) |
| Harmonic distortion factor | 0.004% (20 Hz ~ 20 kHz, Effective Output) |
| Signal-to-noise ratio | Phono MM:88dB Phono MC:68dB |
| Damping factor | 100 |
| Power consumption | 120W |
| External dimensions | Width 430x Height 105x Depth 360 mm |
| Weight | 6.3kg |