SONY TA-1090
¥ 36,800 (around 1975)
Commentary
This pre-main amplifier further improves the cost performance of the TA 1070.
The amplifier section uses a direct-coupling type differential-amplified two power supply and pure complimentary service circuit.
A low-noise transistor is used for the equalizer amplifier.
The 2-power supply system provides sufficient dynamic range and stability.
NF type is used for the tone control.
It is a Lawrence Oak finish.
Model Rating
| Type | Stereo pre-main amplifier |
| Power Amplifier Unit | |
| Circuit system | Direct coupling quasi complimentary service symmetric SEPP circuit |
| Dynamic Power (IHF) | 70W (8 Ω) |
| Effective output (both channel drive) | 23W + 23W (8 ω, 1 kHz) 20W + 20W (8 Ω, 40 Hz to 20 kHz) |
| Output Bandwidth Characteristics (IHF) | 10 Hz to 40 kHz |
| Harmonic distortion factor | 0.5% or Less (Rating) 0.2% or Less (at 1W) |
| Cross modulation distortion factor (60Hz:7kHz=4:1) |
0.5% or Less (Rating) 0.2% or Less (at 1W) |
| Damping factor | 22 or More (1 kHz, 8 Ω) |
| Preamplifier Section | |
| Phono input | Phono1, 2 : 2.5mV/47k Ω |
| Phono maximum allowable input | Phono1, 2 : 70 mV |
| PhonoSN ratio | Phono1, 2 : 70 dB or more (input 2.5 mV, B network) |
| Output Level / Impedance | Rec out1, 2 : 250mV/13k Ω |
| Loudness control (Volume-30dB) |
+10dB(50Hz) +3dB(10kHz) |
| Tone control | Bass : ± 10 dB (100 Hz) Treble : ± 10 dB (10 kHz) |
| Filter | High : 5 kHz or higher, 6dB/oct. |
| <General> | |
| Power outlet | Power switch interlock : 2 systems Power switch not linked : 1 system Total 500W |
| Power consumption | 65W |
| External dimensions | Width 416x Height 120x Depth 285 mm |
| Weight | 6.1kg |