SONY ST-5066
¥ 24,800 (released in 1973)
Commentary
An FM/AM tuner that is strong in strong electric fields and capable of receiving weak radio waves.
The front-end high-frequency amplifier circuit uses a junction FET with a special structure to suppress noise and improve S/N because of its low noise and high amplification.
In addition, stable local oscillation circuit and mixer circuit using FET are mounted.
Two solid state filters of 2-element 1-package type are used for the IF part, and it is designed with high accuracy and no adjustment deviation.
The MPX circuit is equipped with three transistors and peripheral coils are also unitized to reduce the number of parts and improve reliability.
In addition, by making it a sealed unit without adjustment, the influence of heat and moisture is suppressed and aging is suppressed.
The AM section has an independent circuit configuration, and by adopting a high-selectivity triple-tune IFT, reception with high sensitivity and less spurious beats is possible.
.JPG)
Model Rating
| Type | FM/AM Tuner |
| Circuit system | Superheterodyne system |
| FM Tuner Section | |
| Antenna terminal | 300 Ω Balanced Type 75 Ω Unbalanced Type |
| Receiving frequency | 75 mhz to 90 mhz |
| Intermediate frequency | 10.7MHz |
| Practical sensitivity | 2.2 μ V (IHF) |
| Sensitivity | 1.7 μ V (S/N = 30 db) |
| Signal-to-noise ratio | 68dB |
| Capture ratio | 1.5dB |
| Selectivity | 55dB(IHF) |
| Image interference ratio | 45dB |
| IF interference ratio | 95dB |
| Spurious interference ratio | 75dB |
| AM suppression ratio | 45dB(IHF) |
| Frequency characteristic | 30 Hz to 15 kHz, + 1-3 dB |
| Distortion factor | Mono : 0.5% at 400 Hz with 100% modulation Stereo : 0.8% at 400 Hz, 100% modulation |
| FM stereo separation | 35 dB or More (400 Hz) |
| Output Voltage / Impedance (400 Hz at 100% modulation) |
High : 1.5V/3.3k Ω Normal : 0.75V/4.5k Ω |
| <AM Tuner Section> | |
| Antenna | Ferrite bar antenna With External Antenna Terminal |
| Receiving frequency | 530 kHz to 1,605 kHz |
| Intermediate frequency | 455kHz |
| Sensitivity | 48dB/m (when bar antenna is used) 100 μ V (when external antenna is used) |
| Signal-to-noise ratio | 50dB(50mV/m) |
| Image interference ratio | 45dB(1,000kHz) |
| IF interference ratio | 40dB(1,000kHz) |
| Distortion factor | 0.6% |
| <General> | |
| Semiconductor used | Transistor : 20 (17 receiving circuits, 3 attached circuits) FET:2 Diode : 14 |
| Pwer | 100 VAC, 50Hz/60Hz |
| Power consumption | 18W |
| External dimensions | Width 416x Height 120x Depth 284 mm |
| Weight | 4.8kg |