Sony ST-5090
A solid-state FM/AM stereo tuner from Sony with high sensitivity and dual output options, finished in Lawrence Oak.
Overview
The Sony ST-5090 is an FM/AM stereo tuner built for high-fidelity systems. It gives better cost performance than the earlier ST 5070. The front panel has a large backlit tuning meter, an output level control and a high blend switch for adjusting stereo imaging. The Lawrence Oak finish was made to match other Sony components of the mid-1970s.
Specifications
| Model Rating Type | FM/AM Tuner |
| FM Tuner Section Antenna terminal | 300 Ω Balanced Type, 75 Ω Unbalanced Type |
| FM Practical sensitivity | 2.2 μ V (IHF standard) |
| FM Sensitivity | 1.7 μ V (SN ratio = 30 dB) |
| FM Signal-to-noise ratio | 68dB |
| FM Capture ratio | 1.5dB |
| FM Selectivity | 55dB(IHF) |
| FM Image interference ratio | 45dB |
| FM IF interference ratio | 95dB |
| FM Spurious interference ratio | 75dB |
| FM AM suppression ratio | 45dB(IHF) |
| FM Frequency characteristic | 30 Hz to 15 kHz +1, -3dB |
| FM Distortion factor Mono | 0.5% at 400 Hz with 100% modulation |
| FM Distortion factor Stereo | 0.8% at 400 Hz with Main 45%, Sub 45%, Pilot 10% modulation |
| FM stereo separation | 35 dB or More (400 Hz) |
| FM Output Voltage / Impedance Normal Output | 750mV / 4.5k Ω |
| FM Output Voltage / Impedance High output | 1.5V / 3.3k Ω |
| AM Tuner Section Antenna | Ferrite bar antenna, With External Antenna Terminal |
| AM Sensitivity | 48dB/m (when bar antenna is used), 100 μ V (when external antenna is used) |
| AM Signal-to-noise ratio | 50dB |
| AM Image interference ratio | 45dB(1,000kHz) |
| AM Distortion factor | 0.6% |
| Power | 100 VAC, 50Hz/60Hz |
| Power consumption | 18W |
| External dimensions | Width 416 x Height 120 x Depth 284 mm |
| Weight | 4.8kg |
Design
The ST-5090 uses a JFET in the high-frequency amplifier and an FET in the mixer. The IF section packs two solid-state filters into a single package. A sealed coil unit in the MPX circuit improves stereo separation and reduces aging effects. The FM tuner uses a frequency linear type varicon. The AM section uses a triple-tune IFT for better selectivity and low distortion. Output goes to two sets of jacks, Normal and High, and the output level control sits on the front panel. The backlit tuning meter, the high blend switch and the Lawrence Oak wood finish round out the unit.
Context
Sony positioned the ST-5090 as higher in cost performance than the ST 5070.
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