DIATONE DA-U880
¥ 59,800 (around 1983)
Commentary
Pre-main amplifier using DC servo system.
DC servo circuits are used for both the control amplifier and the power amplifier, and FET is used for the first stage to achieve clear sound quality from the very low range to the high range.
In order to improve the high-frequency characteristics, the slew rate has been improved. This is a high-speed amplifier in which the output signal rises up to 100 v within 1 μ / sec, and realizes a wide range.
In order to improve the performance of a control amplifier, we focus on the equalizer circuit.
A unique method is used to apply a constant NF from low band to high band to improve stability and sound quality.
In addition, the constant current drive reduces the influence of complicated wiring.
The gain of the equalizer amplifier is changed by the switch, and it is compatible with MC cartridge.
The peak level is indicated by the fluorescent indicator at the front.
Active filters are used for both High and Low frequencies. Sharp characteristics are obtained without using coils, and only the desired frequency band can be cut reliably.
In order to eliminate the influence of the CR circuit and to make the frequency characteristics flat, a tone defeat circuit is adopted to prevent the deterioration of sound quality in tone control.
By using an independent recording selector, it is possible to record FM broadcasts while listening to a record.
A, B B, A + B speaker selector.
In addition, a built-in speaker protection circuit detects overcurrent and DC voltage and notifies with a warning indicator lamp.
Model Rating
Type | DC servo configuration pre-main amplifier |
Output (10 hz ~ 20 khz, THD 0.008%) | 55W + 55W (8 Ω) |
Total harmonic distortion factor (rated output, 8 Ω) | 0.008% |
Output Bandwidth (IHF 0.1% distortion, 8 ω) | 5 Hz to 100 kHz |
Input Sensitivity / Impedance | Phono MC:70dB Phono MM:86dB Tuner, AUX, Play : 120 dB |
Pwer | AC100V 50Hz/60Hz |
Power consumption | 150W |
External dimensions | Width 427x Height 135x Depth 397 mm |
Weight | 10.5kg |