SONY ST-5070
¥ 39,800 (around 1975)
Commentary
FM/AM tuner with audio IC.
A newly developed junction FET is used in the high-frequency amplifier circuit, and excellent characteristics are obtained by stable local oscillation circuit and FET mixer circuit.
The IF section employs a newly developed 2-element one package solid state filter, Hi-Fi IC, and symmetric diode limiter.
In addition, the FM discriminator uses a non-adjustable solid-state discriminator.
The MPX stereo separation circuit employs a high integration IC and a non-adjusting coil unit exclusively for IC.
The AM tuner section consists of one stage high-frequency amplifier circuit and uses a 3-row variable capacitor, and the IF section uses a high-selectivity triple-tune IFT.
The front panel control on the front panel allows you to adjust the level when switching to another source.
Large dial and indicator with lamp are adopted.
Equipped with a newly developed muting switch.
Equipped with 2 sets of output terminals, fixed and variable.
Equipped with a high blend switch.
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 | 1.0dB |
| Selectivity | 70dB(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 : 0.4% at 400 Hz with 100% modulation Stereo : 0.6% at 400 Hz with Main 45% Sub 45% Pilot 10% modulation |
| FM stereo separation | 35 dB or More (400 Hz) |
| Output Voltage / Impedance | Fixed Output : 750mV/10k Ω Variable Output : 0 ~ 1.5V/1.8k Ω |
| <AM Tuner Section> | |
| Antenna | Ferrite bar antenna With External Antenna Terminal |
| Sensitivity | 46dB/m (when bar antenna is used) 100 μ V (when external antenna is used) |
| Signal-to-noise ratio | 50dB |
| Image interference ratio | 70dB(1,000kHz) |
| Distortion factor | 0.5% |
| <General> | |
| Pwer | 100 VAC, 50Hz/60Hz |
| Power consumption | 17W |
| External dimensions | Width 416x Height 120x Depth 284 mm |
| Weight | 4.9kg |