Technics ST-8080(80T)
¥ 50,000 (around 1977)
Commentary
FM/AM tuner paired with integrated DC amplifier 80A.
Two stage amplification using two dual-gate junction FETs with excellent high-frequency characteristics, and a frequency-linear-type FM4-series variable capacitor are adopted to reduce the influence of Radio noises.
The IF stage emphasizes group delay characteristics to achieve both high selectivity and low distortion.
A pilot signal cancellation circuit is used, and the 19 kHz pilot signal used for stereo demodulation is cancelled by an electronic circuit.
We have also applied this circuit to a 38 kHz subcarrier and obtained excellent characteristics.
The MPX section employs an MPX demodulation circuit that employs a PLL-IC that is resistant to changes in temperature and humidity.
Model Rating
| Type | FM/AM Tuner |
| FM Tuner Section | |
| Receiving frequency | 76 MHz to 90 MHz |
| Practical sensitivity | 0.9 μ V (75 Ω) / 10.3 dBf (New IHF) |
| SN ratio 50 dB sensitivity | Mono : 1.8 μ V (75 Ω) / 16.3 dBf (new IHF) Stereo : 20 μ V (75 Ω, 37.2 dBf (new IHF) |
| Distortion factor (100% modulation) | mono:0.15% stereo:0.3% |
| Signal-to-noise ratio (new IHF) | mono:75dB |
| Frequency characteristic | Variable : 20 Hz to 18 kHz + 0.2 -0.8 dB Fixed : 20 Hz to 15 kHz + 0.2 -0.8 dB |
| Effective selectivity | 85dB |
| Capture Ratio (IHF) | 1.0dB |
| Image Interference Ratio (83 mhz) | 80dB |
| IF Interference Ratio (83 MHz) | 95dB |
| Spurious interference ratio (83 MHz) | 90dB |
| AM suppression ratio | 55dB |
| Stereo separation | 45dB(1kHz) 35dB(10kHz) |
| Leak carrier | Variable:-65dB(19kHz) Fixed : -70dB (19 kHz, 38 kHz) |
| <AM Tuner Section> | |
| Receiving frequency | 525 kHz to 1605 kHz |
| Sensitivity (S/N = 20 dB) | 30 μ V |
| Selectivity | 25dB |
| Image interference ratio (1,000 kHz) | 45dB |
| IF disturbance ratio (1,000 kHz) | 40dB |
| <General> | |
| Output voltage | Variable : 0 to 1.4 V Fixed:0.6V |
| Recording level check out | 440 Hz, 50% modulation component |
| Power supply voltage | 100 VAC, 50Hz/60Hz |
| Power consumption | 12W |
| External dimensions | Width 450x Height 140x Depth 367 mm |
| Weight | 6.5kg |