DIATONE DA-R340
¥ 59,000 (released in 1973)
¥ 65,000 (around 1975)
Commentary
FM/AM receiver with high reliability design.
The power amplifier section uses a pure complimentary service OCL circuit directly connected to all stages.
In addition, the power ratio is improved to cope with the electrical impedance variation of the speaker system.
The FM and MPX sections use a double-balanced differential demodulation circuit to eliminate distortion caused by the non-linear part of the diode. The detection stage uses a dispersion transformer with a peak separation of 1 MHz or more, and the IF stage uses a phase linear ceramic filter to obtain excellent characteristics over the entire band.
Equipped with an FM muting circuit with less pop noise.
In this circuit, the bias condition of the transistor of the muting circuit is constant regardless of ON/OFF of the muting operation by the substitution method, and the pop noise can be reduced.
The AM and IF stages use triple tune IFT to improve sound quality.
Mixing recording is possible.
Equipped with FM DET out terminal for FM4ch decoder connection.
Equipped with MPX filter.
Equipped with a selector position indicator.
Model Rating
| Type | AM/FM Receiver | ||||||||
| <Audio section> | |||||||||
| Load impedance | 4 ~ 16 Ω | ||||||||
| Output |
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| Power bandwidth | 10 Hz to 50 kHz | ||||||||
| Harmonic distortion factor | 0.8% (at rated output) 0.06% at 1W output |
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| Frequency characteristic | Phono:RIAA STD Aux : 10 Hz to 50 kHz 0.5 dB |
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| Input Sensitivity / Impedance | Phono : 2.5mV/50k Ω Aux : 150mV/60k Ω Playback : 150mV/60k Ω (pin), 300mV/50k Ω (din) Mic : 1mV/40k Ω |
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| Recorded output | Rec1, 2 : 150 mV (pin), 30 mV (din) | ||||||||
| Tone control | Bass : ± 10 dB (100 Hz) Treble : ± 10 dB (10 kHz) |
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| Residual noise | 0.9mV | ||||||||
| Input reduced noise | Phono:-118dB(V) Aux:-100dB(V) Mic:-124dB(V) |
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| FM Tuner Section | |||||||||
| Antenna | 300 Ω balanced, 75 Ω unbalanced | ||||||||
| Practical sensitivity | 1.8 μ V (IHF) | ||||||||
| Effective selectivity | 60dB(IHF) | ||||||||
| Capture ratio | 1.5dB(IHF) | ||||||||
| Image interference ratio | 60dB | ||||||||
| IF interference ratio | 70dB | ||||||||
| AM suppression ratio | 50dB | ||||||||
| S/N | 70dB | ||||||||
| Harmonic distortion factor (100% modulation) | mono:0.2% stereo:0.5% |
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| Separation | 40dB(1kHz) 30dB(10kHz) |
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| Muting / MPX Noise Filter | ON / OFF Enabled | ||||||||
| <AM Tuner Section> | |||||||||
| Practical sensitivity | 55 dB (Bar Antenna S/N 30 dB) | ||||||||
| Selectivity | 35 dB (± 10 kHz) | ||||||||
| Image interference ratio | 40dB | ||||||||
| S/N | 50dB | ||||||||
| <General> | |||||||||
| Power consumption | 61W | ||||||||
| External dimensions | Width 450x Height 146x Depth 330 mm | ||||||||
| Weight | 10.5kg | ||||||||