SONY ST-JX5
¥ 53,000 (around 1981)
Commentary
An FM/AM tuner that inherits the design philosophy of the ST-J75 and realizes various functions by computer control.
In addition to using a direct comparator, it also uses parts such as PLL MPX IC with built-in pilot signal cancellation, DC audio amplifier, and audio condenser.
Up to eight FM/AM stations can be preset at random. In addition, a multi-process memory is used to store the FM/AM band, muting, FM mode and SENS settings for each station.
A 4-speed tuning system of quick search, sweep and step achieves accurate tuning.
Up to 4 FM/AM stations can be programmed.
This allows you to call up up to four preset stations one after another in conjunction with the timer, and record your absence in order at the time of your children.
Quartz lock digital synthesizer system is adopted.
Equipped with a direct comparator.
A 4-stage varicap is used for the front end, and a dual-gate MOS FET is used for the RF amplifier.
Both FM and AM are equipped with a sense switch that increases sensitivity.
The AM tuner uses an IF band switching system.
The memory IC uses a non-volatile memory that does not lose memory even when the power outlet is unplugged.
It is equipped with CAL TONE.
Equipped with a 3-point LED signal indicator.
Model Rating
| Type | FM/AM Tuner |
| Practical sensitivity | 1.8 μ V (IHF), 10.3 dBf (new IHF) |
| Stereo distortion factor | 0.08% |
| Effective selectivity | 90dB(400kHz) 60dB(300kHz) |
| Spurious interference ratio | 100dB |
| Separation | 55dB |
| Power consumption | 15W |
| External dimensions | Width 430x Height 55x Depth 330 mm |
| Weight | 3.6kg |
| Attachment | Station name display card |