Assembled Marantz MA-9S2 250W with DC Servo Amplifier Board
Using original NJW0281 / NJW0302 and 2SA1930 / 2SC5171.
Resistance selection Rings metal resistance, the main circuit employs a precision of ± 1% metal film resistors rings, ensure the machine a good signal to noise ratio.
1.6mm thick sheet using double-sided PCB, 2.0 oz copper thickness, HASL whole process to ensure that the size of the current through the good performance. PCB-class quality.
The entire circuit board trace layout is quite strict and reasonable, the overall PCB traces using a little grounding. The amplifier board is stable and reliable, high output power; beautiful mellow sound, open sound field. Dimensional sense of strong, solid and strong low-frequency steady, very good signal to noise ratio, wide dynamic range; the details clear, excellent transient response, playing all kinds of music are comfortable with, in the home of the playback environment has a very good performance.
PCB size: 83X167MM
Supply voltage: DC DC dual 30-50V,
Recommended +/- 45V,
Dual 32V transformer rectifier to + -45V
Power output: 250 watts (total harmonic distortion THD + N <0.1%),
DC + -50V, 4 ohm load was measured;
Adjust VR1 (1K precision adjustable resistors) quiescent current makes about 100MA, VR1 counterclockwise quiescent current becomes large, clockwise is reduced!
1pc Assembled Marantz MA-9S2 with DC servo Amplifier Board 250W
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