DIATONE DA-U630
¥ 53,000 (around 1979)
Commentary
A pre-main amplifier with improved play functions such as a triple mixing circuit.
The power amplifier section is a first stage differential amplifier and all stages are directly connected and pure complimentary service OCL circuit to obtain excellent distortion factor characteristics.
The equalizer amplifier and tone control flat amplifier are first stage differential amplifier, and 4-stage direct-coupled low-noise IC is adopted.
The built-in mixing amplifier allows for triple microphone mixing using two wired microphones and one wireless microphone. You can also echo the microphone by using a reverb circuit.
The LED power level indicator on the digital display is used to indicate the power level.
The output level can be read directly by 9 points of one channel.
A built-in protective circuit that combines an electronic circuit and a relay. When a DC potential higher than a certain level is generated at the output terminal of the power amplifier, the output of the amplifier and the speaker are instantly disconnected to protect the speaker from damage.
This protection circuit also functions as a muting circuit to prevent click noise generated when the power is turned ON / OFF.
It has a tape-duplicate switch for easy tape-to-tape copying.
Equipped with a low-cut filter.
Model Rating
Type | Pre-main amplifier |
Output | 50W + 50W (1 kHz, Rated Output) |
Harmonic distortion factor | 0.05% (8 Ω at Rated Output) |
Output Bandwidth (IHF 0.05% distortion, 8 ω) | 10 Hz to 30 kHz |
S/N (A network, input terminal short) | Phono:74dB Tuner, Aux, Play : 100 dB |
Damping factor | 25 |
Input Sensitivity / Impedance | Phono : 2.5mV/50k Ω Tuner, Aux, Play1, 2 : 150mV/45k Ω Mic, Guitar/Mic : 1mV/10k Ω |
Output Level / Impedance | Rec1, 2 : 150mV/600 Ω Headphone : 400mV/8 Ω |
Frequency characteristic | Phono : 20 Hz to 20 kHz ± 0.5 dB Tuner, Aux, Play : 10 hz to 30 khz + 0 -1dB |
Tone control | Bass : ± 10 dB (100 Hz) Treble : ± 10 dB (10 kHz) |
External dimensions | Width 424x Height 140x Depth 254 mm |
Weight | 6.1kg |