Technics ST-8077(77T)
¥ 45,800 (around 1979)
Commentary
FM/AM tuner with active servo lock circuit, etc.
It employs an active servo lock circuit that automatically compensates for frequency shifts caused by various factors including the IF stage and detection circuit.
As a result, even if the frequency is modulated on the side of the transmitted radio wave, the tuning point is followed flexibly and kept accurately.
It uses an active sensor system in which information for tuning and tuning is concentrated in the LED indicator.
The indicator consists of two yellow LEDs (arrows) and a red LED (line). At the tuning point, the left and right arrows disappear and only the line type LED lights up.
It is equipped with a pilot signal cancellation circuit that removes the 19 kHz pilot signal.
This uses an electronic circuit instead of a low-pass filter, and achieves broadband and flat frequency characteristics while suppressing 19 kHz leak carrier to -65dB or less.
It uses a highly stable 5-stage differential amplification IF stage with excellent limiter characteristics. It uses a surface acoustic wave (SAW) filter that can set group delay characteristics and amplitude characteristics independently and a 4-resonance element type ceramic filter that emphasizes group delay characteristics to achieve low distortion and high selectivity.
Equipped with Rec level check switch.
Equipped with muting of 3 positions of fine, standard and off. In the fine position, 77T automatically selects only high-fidelity stations with stereo distortion equivalent to 0.2% or less.
There are 2 variations, black and silver.
.JPG)
.JPG)
Model Rating
| Type | FM/AM Tuner |
| FM Tuner Section | |
| Receiving frequency | 76.0 mhz to 90.0 mhz |
| Practical Sensitivity (75 Ω) | 10.3 dBf (0.9 μ V, IHF' 58) |
| SN ratio 50 dB sensitivity | Mono : 16.3 dBf (1.8 μ V, IHF' 58) Stereo : 37.2 dBf (20 μ V, IHF' 58) |
| Total harmonic distortion factor | mono:0.08% stereo:0.1% |
| Signal-to-noise ratio | mono:75dB |
| Frequency characteristic | 20 Hz to 18 kHz + 0. 1-0. 5 dB |
| Effective selectivity | 75dB |
| Capture ratio | 1.0dB |
| Image interference ratio | 85dB(83MHz) |
| IF interference ratio | 105dB(83MHz) |
| Spurious interference ratio | 95dB(83MHz) |
| AM suppression ratio | 55dB |
| Stereo separation | 45dB(1kHz) 35dB(10kHz) |
| Leak carrier | -60dB(19kHz) |
| <AM Tuner Section> | |
| Receiving frequency | 525 kHz to 1605 kHz |
| Practical sensitivity | 30 μ V |
| Selectivity | 40dB |
| Image interference ratio (1,000 kHz) | 45dB |
| IF disturbance ratio (1,000 kHz) | 40dB |
| <General> | |
| Output voltage | 0.8V |
| Power supply voltage | 100 VAC, 50Hz/60Hz |
| Power consumption | 8W |
| External dimensions | Width 450x Height 53x Depth 316 mm |
| Weight | 4.2kg |