Finished Marantz MA-9S2 Amplifier Board with DC Servo 250W 2SA1930/2SC5171

Description

Finished Marantz MA-9S2 Amplifier Board with DC Servo 250W 2SA1930/2SC5171
Description:
All parts of this product are original, unpretentious and pure in quality; the use of high-quality original parts is not only a guarantee of safety and quality, long service life, but also a strong guarantee that the actual performance can reach the design goal. Pursuing the first quality is our consistent aim. Note that this is a semi-finished product, as shown.
1. Using original NJW0281/NJW0302 and 2SA1930/2SC5171.
2. The five-ring metal resistor is used for the resistor, and the five-ring metal film resistor with an accuracy of ±1% is used for the main circuit, which ensures a good signal-to-noise ratio of the whole machine.
3. The PCB is made of 1.6mm thick double-sided sheet, 2.0 oz copper thickness, and full tin spraying process to ensure good passing performance of large and small currents and PCB quality.
The wiring layout of the entire circuit board is quite rigorous and reasonable, and the overall PCB wiring adopts a one-point grounding method. The power amplifier board works stably and reliably, with large output power; the sound is beautiful and round, and the sound field is wide. Strong three-dimensional sense, stable and powerful low frequency, excellent signal-to-noise ratio, wide dynamic range; clear details, excellent transient response, easy to play all kinds of music, and has a very good performance in the home playback environment.
Parameters:
PCB size: 83X167MM
Impedance: 4-8 ohms
Power supply voltage: DC DC double 30-50V, recommended +/-45V, after the transformer double 32V rectification, it is +-45V
Output power: 250W (Total Harmonic Distortion THD+N<0.1%), DC+-50V, measured under 4 ohm load;
Debugging:
Adjust VR1 (1K precision adjustable resistor) to make the quiescent current about 100MA, VR1 anti-clockwise quiescent current increases, clockwise decreases!
Package:
1pc
Finished Marantz MA-9S2 Amplifier Board