SONY ST-5090
¥ 34,800 (around 1975)
Commentary
FM/AM tuner with higher cost performance than the ST 5070.
JFET is used for the high-frequency amplifier circuit and FET is also used for the mixer circuit.
The IF section uses two solid-state filters with two elements in one package.
By adopting a sealed coil unit for the MPX circuit, the separation degree is improved and the aging is suppressed.
The AM tuner uses a triple-tune IFT to achieve high selectivity, high signal-to-noise ratio and low distortion factor.
The FM tuner section uses a frequency linear type varicon.
Output level control is mounted on the front panel.
Uses a large tuning meter with back lighting.
Two sets of output jacks, Normal and High, are mounted.
Equipped with a high blend switch.
It is a Lawrence Oak finish.
Model Rating
| Type | FM/AM Tuner |
| FM Tuner Section | |
| Antenna terminal | 300 Ω Balanced Type 75 Ω Unbalanced Type |
| Practical sensitivity | 2.2 μ V (IHF standard) |
| Sensitivity | 1.7 μ V (SN ratio = 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 -3dB |
| Distortion factor | Mono : 0.5% at 400 Hz with 100% modulation Stereo : 0.8% at 400 Hz with Main 45% Sub 45% Pilot 10% modulation |
| FM stereo separation | 35 dB or More (400 Hz) |
| Output Voltage / Impedance | Normal Output : 750mV/4.5k Ω High output : 1.5V/3.3k Ω |
| <AM Tuner Section> | |
| Antenna | Ferrite bar antenna With External Antenna Terminal |
| Sensitivity | 48dB/m (when bar antenna is used) 100 μ V (when external antenna is used) |
| Signal-to-noise ratio | 50dB |
| Image interference ratio | 45dB(1,000kHz) |
| Distortion factor | 0.6% |
| <General> | |
| Pwer | 100 VAC, 50Hz/60Hz |
| Power consumption | 18W |
| External dimensions | Width 416x Height 120x Depth 284 mm |
| Weight | 4.8kg |