DIATONE DA-R400
¥ 90,000 (released in 1973)
¥ 100,000 (around 1974)
Commentary
A 4-channel receiver with built-in SE decoder in addition to RM (regular matrix) and SQ matrix circuits.
The amplifier section is equipped with a two source simultaneous play mechanism, so that two sources such as disc and FM broadcast or disc and tape can be played simultaneously in two channels.
Pure complimentary service OTL circuit is adopted in the power amplifier section, and noise and distortion are reduced by eliminating the condenser between stages.
SE logic circuit is adopted in the decoder section.
This eliminates crosstalk, which is said to be a defect of the conventional matrix 4 channel, and improves separation.
The FM tuner uses FET and RF1-stage amplification.
Equipped with a microphone mixing circuit.
4-channel recording and playback is possible.
Equipped with 4 level meters.
Die-cast frame is used for the front panel.
Model Rating
| Type | 4 ch receiver | ||
| <Audio section> | |||
| Output |
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| Power Ratio | 2.6 | ||
| Power bandwidth | 20 Hz to 20 kHz | ||
| Input Sensitivity / Impedance | Phono : 2mV/50k Ω Mic : 1.5mV/50k Ω Aux : 150mV/60k Ω Discrete : 150mV/150k Ω Tape play : 150mV/50k Ω |
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| Harmonic distortion factor | 0.8% (at rated output) 0.06% at 1W output |
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| Tone control | Bass : ± 10 dB (100 Hz) Treble : ± 10 dB (10 kHz) |
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| Residual noise | 0.5mV | ||
| Input reduced noise | Phono:-120dB(V) Aux:-109dB(V) Mic:-123dB(V) |
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| Matrix Decoder Unit | |||
| RM Decoder Separation (1 kHz Input) | Left and right (also called front and rear) : 13 dB Before and after (monaural signal) : 16 dB Between diagonal channels : 20 dB |
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| SQ Decoder Separation (1 kHz Input) | Left / right : 10 dB Front and back (monaural signal) : 6 dB |
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| FM Tuner Section | |||
| Antenna | 300 Ω balanced, 75 Ω unbalanced | ||
| Practical sensitivity | 2 μ V (IHF) | ||
| Image interference ratio | 60dB(IHF) | ||
| IF interference ratio | 90dB | ||
| S/N | 70dB | ||
| Harmonic distortion factor (100% modulation) | mono:0.2% stereo:0.5% |
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| Separation | 30dB | ||
| <AM Tuner Section> | |||
| Practical sensitivity | 55 dB (bar antenna, S/N 30 dB) | ||
| S/N | 55dB | ||
| <General> | |||
| Power consumption | 67W | ||
| External dimensions | Width 497x Height 139x Depth 398 mm | ||
| Weight | 13.6kg | ||