Marantz ST-50
¥ 44,800 (around 1980)
Commentary
FM/AM tuner of Marantz slim type component component 50 series.
Marantz's original gyro-touch tuning is adopted, and tuning is performed by directly rotating the flywheel with large inertial mass.
By using oilless metal for the bearing, smooth rotation is achieved.
In order to obtain stable reception performance, a servo lock mechanism is installed in the station output circuit.
In addition, the system is equipped with an electronic touch switch that unlocks the servo lock while the dial is in contact and locks when the dial is released after adjusting to the best tuning point.
In addition, a switch for releasing the servo lock is mounted independently so that it can be used for listening stations adjacent to strong frequencies.
The front-end section contains a dual-gate MOS FET, the IF section contains a linear-phase IF filter, and the MPX section contains a PLL canceler circuit to achieve sharp reception sensitivity, low distortion rate and high S / N ratio.
Equipped with a muting circuit.
The ST-50 is equipped with a unique parametric muting circuit that operates by two signals, an RF signal and a DC offset voltage of a quadrature detector. The ST-50 can also be tuned quietly in weak radio waves.
Equipped with a 5-stage LED signal strength indicator that shows the strength of the signal at the time of tuning.
In addition, it is equipped with a tuning indicator that can check the best tuning point of FM reception with LED.
Model Rating
Type | Stereophonic tuner |
FM Tuner Section | |
Receiving frequency range | 76 MHz to 90 MHz |
Practical sensitivity of IHF | 10.3dBf/1.8 μ V |
50 dB quadrature sensitivity | Mono : 13.2dBf/2.5 μ V Stereo : 36.1dBf/35 μ V |
Harmonic distortion factor (1 kHz) | mono:0.1% stereo:0.2% |
Frequency response (mono) | 30 Hz to 15 kHz + 0.2 -1.0 dB |
Capture ratio | 1.0dB |
Effective selectivity | 63dB |
Image interference ratio | 80dB |
Intermediate frequency interference ratio | 100dB |
AM suppression ratio | 55dB |
Stereo separation | 48dB(1kHz) |
<AM Tuner Section> | |
Receiving frequency range | 531 kHz to 1602 kHz |
Practical sensitivity of IHF | 20 μ V |
Signal-to-noise ratio | 50dB |
Harmonic distortion factor | 0.5% |
<General> | |
Power supply voltage | 100 VAC, 50Hz/60Hz |
Power consumption (Electrical Appliance and Material Control Law) | 13W |
External dimensions | Width 416x Height 73x Depth 193 mm |
Weight | 3.2kg |