SONY ST-5000F
¥ 98,000 (released in 1969)
Commentary
A top-of-the-line FM stereo tuner developed with Sony's technical capabilities to meet the needs of the FM multi-station era and achieve superior reception performance even in strong electric fields.
A high-precision 5-row varicon is used for the front end section, and a 4-stage tuning circuit is constructed.
Selective low-noise FETs and circuit technology improve intermodulation and interference rejection characteristics.
The intermediate frequency stage configuration consists of nine IF amplifiers, eight newly developed solid-state filters, six symmetrical diode limiters, and three transistor limiters.
This enables stable reception of the weak broadcasts immediately adjacent to powerful high-power stations.
In addition, the solid state filter is completely non-adjustable to prevent changes over time.
In order to receive as many stations as possible during muting operation, the muting operation level is designed to be low enough (3 μ V ~).
It is equipped with a high-blend circuit that mixes the left and right channels to cancel out high-frequency noise when the stereo signal is weak.
It can be switched to 3 levels so that the lowest condition can be selected depending on the strength of the radio wave.
In addition to the tuner input meter, it is equipped with a full-scale tuning meter that can be tuned to the midpoint of the discriminator.
With a 230 mm wide dial, it is equipped with a highly accurate linear scale that can directly read 200 kHz.
By using the highest quality parts, it boasts a stability of ± 20 khz or less against temperature changes of -5 ℃ to + 45 ℃.
Two systems of fixed and variable output are mounted.
.JPG)
Model Rating
| Type | FM stereo tuner |
| Circuit system | Superheterodyne system |
| Receiving frequency | 76 MHz ~ 90 MHz (3.95 ~ 3.33m) |
| Intermediate frequency | 10.7MHz |
| Practical sensitivity | 1.5 μ V (IHF) |
| Signal-to-noise ratio | 70dB |
| Capture ratio | 1.0dB |
| Effective selectivity | 100dB(IHF) |
| Image interference ratio | 90dB |
| IF interference ratio | 100dB |
| Spurious interference ratio | 100dB |
| AM suppression ratio | 65dB |
| Muting level | 3 μ V ~ 15 μ V (Continuously Variable) |
| Frequency characteristic | 20 Hz to 15 kHz, ± 0.5 dB |
| Antenna terminal | 300 Ω equilibrium 75 Ω unbalance |
| Harmonic distortion factor | Mono : 0.2% at 400 Hz, 100% modulation Stereo : 0.35% at 400 Hz, 100% modulation |
| FM stereo separation | 40 dB or more (mid-range, 100% modulation) 30 dB or more (50 Hz, 100% modulation) 30 dB or more (10 kHz, 100% modulation) 20 dB or more (15 kHz, 100% modulation) |
| Automatic stereo operating level | 3 μ V |
| SCA suppression ratio | 65dB |
| 19 khz and 38 khz suppression ratio | 70dB |
| Frequency drift (83 MHz) | -5 ° C to + 45 ° C, ± 20 kHz |
| Output Voltage / Impedance | Fixed output : 700mV/10k Ω (at 400 Hz, 100% modulation) Variable output : 0 ~ 2V/1k Ω (at 100% modulation at maximum output) |
| Semiconductor used | Transistor : 39 FET : 3 Diode : 36 units |
| Pwer | 100 VAC, 50Hz/60Hz |
| Power consumption | Approx. 20W |
| External dimensions | Width 400x Height 145x Depth 310 mm |
| Weight | 9.2kg |
| Attachment | One FM feeder antenna Connection code RK-56x1 1 spare fuse (1A) Polishing Cloth x1 |
| Sold Separately | Eurasian Cheek Finish Wooden Case TAC-1 (¥ 4,600) Mounting Bracket MB-5 (¥ 2,800) |