Tube model : 6SN7 /6N8P 1. Circuit features: Audio amplification uses only one 6SN7 double triode to complete left and right channel amplification. The change of preamplifier board only changes the installation position of the coupling capacitance: the coupling capacitance of the original M2 main board is suspended outside the PCB board, and the coupling capacitance we designed is installed on the PCB board.
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