SONY TA-F4
¥ 49,800 (released in 1977)
Commentary
In addition to excellent regulation, this DC pre-main amplifier uses a pulse power supply without a power supply hum.
The equalizer amplifier uses a low-noise transistor in the first stage to lower the equivalent noise resistance, and uses a high-precision RIAA element in the NF circuit to improve the characteristics.
In the power amplifier section, monolithic ICs are used in the driver stage, and pure complimentary service SEPP circuit with power transistors with good linearity is used in the output stage.
The tone control is equipped with a self-defeat tone control that automatically weakens the tone circuit when the knob is in the defeat position.
Uses 4-connected volume to improve SN at low volume.
It is equipped with a 2-system tape monitor which can use 2 tape decks.
In addition, it is equipped with a bidirectional tape copy switch Tape1 → 2 and 2 → 1 regardless of the signal of the amplifier body.
.JPG)
Model Rating
| Type | Pre-main amplifier |
| Effective output (20 Hz to 20 kHz, both channels) | 55W + 55W (8 Ω) |
| Output Bandwidth (IHF, 8 ω) | 5 Hz to 35 kHz |
| Harmonic distortion factor | 0.05% (20 Hz ~ 20 kHz, Effective Output) |
| Cross modulation distortion factor (at effective output) | 0.01% |
| Damping factor (1 kHz, 8 Ω) | 40 |
| Phono input sensitivity | 2.5mV |
| Phono maximum allowable input (1 kHz) | 250mV |
| Tone control | Bass : 60 Hz ± 10 dB (300 Hz) Treble : 25 kHz ± 10 dB (5 kHz) |
| Filter | Low : 6dB/oct. (15 Hz or less) High : 6dB/oct. (9 kHz or higher) |
| Power consumption | 100W |
| External dimensions | Width 410x Height 145x Depth 370 mm |
| Weight | 6.8kg |
| Sold Separately | Rack Handle AH-4A (1 set, ¥ 2,500) |