SONY ST-5500
¥ 29,800 (around 1970)
Commentary
FM/AM tuner designed for easy listening to FM broadcasts.
The FM is used in the FM front-end section to obtain excellent intermodulation and interference rejection characteristics.
In addition, it has good sensitivity and is compatible with multi-station FM.
The IF stage of the FM IF uses a solid state filter that is stable and has good selectivity and bandwidth characteristics, resulting in excellent stereo distortion and stereo separation characteristics.
A new approach has been introduced to the gain distribution of each stage, so that there is little noise (inter-station noise) at the time of FM detuning, and station selection can be done as comfortably as with muting.
The coil of the multiplex circuit is made into a block to suppress secular change.
The AM circuit is designed to be completely separate from the FM circuit.
A solid-state filter is also adopted in the IF stage of the AM to realize reception with less interference.
The built-in bar antenna for AM reception is a rotary type, which avoids noise and enables reception with high sensitivity.
The output terminal is equipped with 2 systems of fixed output and variable output.
Model Rating
| Type | FM/AM Tuner |
| FM Tuner Section | |
| Receiving frequency | 76 MHz to 90 MHz |
| Intermediate frequency | 10.7MHz |
| Sensitivity | 3 μ V (IHF Standard Practical Sensitivity) 2.0 μ V (S/N = 30 db) 1.4 μ V (S/N = 20 db) |
| S/N | 65dB |
| Capture ratio | 1.6dB |
| Selectivity | 60dB |
| Image interference ratio | 43dB |
| IF interference ratio | 82dB |
| Spurious interference ratio | 78dB |
| AM suppression ratio | 50dB |
| Frequency characteristic | 30 Hz to 15 kHz ± 1 dB |
| Antenna terminal | 300 Ω equilibrium |
| Distortion factor | Mono : 0.3% at 400 Hz, 100% modulation Stereo : 0.7% at 400 Hz, 100% modulation |
| FM stereo separation factor | 38 dB or More (400 Hz) |
| 19 kHz : 38 kHz suppression ratio | 50dB |
| <AM Tuner Section> | |
| Receiving frequency | 530 kHz to 1,605 kHz |
| Intermediate frequency | 455kHz |
| Sensitivity | 48dB/m with built-in antenna 20 μ v (when external antenna is used) |
| S/N | 50dB |
| Image interference ratio | 56dB(1,000kHz) |
| IF interference ratio | 40dB(1,000kHz) |
| Distortion factor | 0.8% |
| Antenna | Ferrite bar antenna With External Antenna Terminal |
| <General> | |
| Rated output | Fixed output (Fix) : 750mV/5k Ω Variable output : 0 ~ 1.5V/2.5k Ω (at maximum output) |
| Circuit system | FM stereo / FM-AM tuner superheterodyne system |
| Semiconductor used | Receiving circuit FET : 1 Transistor : 17 Accessory circuit Transistor : 2 Diode : 18 pcs |
| Power supply voltage | 100 VAC, 50Hz/60Hz |
| Power consumption | 13W |
| External dimensions | Width 420x Height 123x Depth 265 mm |
| Weight | 4.1kg |
| Attachment | Ribbon antenna for FM Connection code RK-74 Polishing cloth |
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