Technics ST-9031T
¥ 39,800 (around 1979)
Commentary
The FM/AM tuner uses a SAW filter to achieve high selectivity.
A surface acoustic wave (SQW) filter and two 4-resonant ceramic filters are used as the selection elements of the IF stage.
The MPX stereo demodulation circuit uses a jitter distortion removal circuit to suppress distortion in the high frequency range and improve separation.
A 4-pole MOS type FET with a large gain and high stability and a frequency linear FM4-series variable capacitor are used for the RF stage.
Model Rating
| Type | FM/AM Tuner |
| FM Tuner Section | |
| Receiving frequency | 76 MHz to 90 MHz |
| Practical sensitivity | 12.8 dBf (1.2 μ V, IHF' 58, 75 Ω) |
| SN ratio 50 dB sensitivity | Mono : 18.1 dBf (2.2 μ V, IHF' 58, 75 Ω) Stereo : 39.5 dBf (26 μ V, IHF' 58, 75 Ω) |
| Total harmonic distortion rate (1 kHz) | mono:0.08% stereo:0.1% |
| Signal-to-noise ratio | mono:75dB stereo:70dB |
| Frequency characteristic | 20 Hz ~ 15 kHz + 0. 2-0. 8 dBf |
| Selectivity | 75dB |
| Capture ratio | 1.0dB |
| Image interference ratio | 80dB(83MHz) |
| IF interference ratio | 100dB(83MHz) |
| Spurious interference ratio | 95dB(83MHz) |
| IM interference ratio | 90dB(83MHz) |
| AM suppression ratio | 55dB |
| Stereo separation | 50dB(1kHz) 40 dB (100 Hz, 10 kHz) |
| Leak carrier | -60dB (19 kHz, 38 kHz) |
| Antenna terminal | 75 Ω (unbalanced type) |
| <AM Tuner Section> | |
| Receiving frequency | 525 kHz to 1605 kHz |
| Practical sensitivity | 30 μ V / 250 μ V/m |
| Selectivity | 40dB |
| Image interference ratio (1,000 kHz) | 45dB |
| IF disturbance ratio (1,000 kHz) | 40dB |
| <General> | |
| Output voltage | 0.6V |
| Power supply voltage | 100 VAC, 50Hz/60Hz |
| Power consumption | 12W |
| External dimensions | Width 430x Height 97x Depth 300 mm |
| Weight | 4.5kg |