SONY ST-A40
¥ 34,000 (around 1979)
Commentary
FM/AM tuner equipped with newly developed acute servo lock mechanism.
Equipped with an acute servo lock mechanism that was developed with the main goal of easily selecting the lowest tuning point accurately and obtaining stable tuning. While watching the LED indicator, the system receives the desired station at the point of the optimum tuning point (minimum distortion rate, best separation) and locks it firmly to maintain stable reception.
Tuning (locking) is indicated by the green LED and the red LEDs arranged on both sides of the green LED. When the green LED lights up, it is the optimum tuning point for accurate servo lock.
J-FET is used in the front end section, and uniphase filter is used in the IF stage.
PLL-IC is used for the MPX part.
It is equipped with a CAL-TONE circuit and pilot signal cancellation circuit.
Equipped with a 5-segment LED signal indicator.
Model Rating
| Type | Acute Servo Lock FM/AM Tuner |
| Practical sensitivity | 1.8 μ V |
| Stereo distortion factor | 0.15% |
| Effective selectivity | 80dB |
| Separation | 50dB |
| Power consumption | 8W |
| External dimensions | Width 430x Height 80x Depth 275 mm |
| Weight | 3.3kg |