DIATONE DA-R320
¥ 45,000 (released in 1973)
¥ 48,000 (around 1975)
Commentary
An FM/AM receiver that is a sister machine of the DA-R340.
The power amplifier section increases the drive performance of low-impedance speakers by increasing the power ratio to 2.6.
It is also equipped with CR-type tone control and loudness mechanism.
Phase linear ceramic filters, monolithic ICs with excellent limiter effects, and dispersion transformers with peak separation of 1 MHz are used in the FM and IF stages.
The FM and MPX stages employ double-balanced differential demodulation ICs and mold transformers with high Q and excellent temperature and humidity resistance characteristics.
An FM muting circuit is mounted. In this circuit, the bias condition of the transistor of the muting circuit is fixed by the substitution method regardless of ON/OFF of the muting operation, so that the pop noise is reduced.
The AM and IF stages use triple tune IFT to enhance the AM receiving mechanism.
Equipped with a microphone mixing circuit.
The FM DET out terminal is provided to connect the decoder for FM4ch.
Equipped with a selector position indicator.
Model Rating
| Type | AM/FM Receiver | ||||||||
| <Audio section> | |||||||||
| Output |
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| Power bandwidth | 20 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 : 20 Hz to 30 kHz ± 1 dB |
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| Input Sensitivity / Impedance | Phono : 2.5mV/50k Ω Aux : 150mV/60k Ω Playback : 150mV/50k 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 | 0.5mV | ||||||||
| 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(IHF) | ||||||||
| IF interference ratio | 70dB | ||||||||
| 1/2 IF interference ratio | 60dB | ||||||||
| 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 | ON / OFF Enabled | ||||||||
| <AM Tuner Section> | |||||||||
| Antenna | With Ferrite Bar Antenna | ||||||||
| 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 | 53W | ||||||||
| External dimensions | Width 450x Height 146x Depth 330 mm | ||||||||
| Weight | 9.9kg | ||||||||