This board is designed according to the panel size of AUDIONOTE MEISHU 300B. The distance between the upper and lower knobs is 60MM. If this size is suitable, it is suitable for use.The PCB uses 2MM thick FR4, 75uF copper thickness, and double-sided tin spraying.The signal selection switch (fourth gear) and the function changeover switch (second gear) are the original ALPS switches. The balance potentiometer is our special MN type balance potentiometer customized from Taiwan Fuhua, and the volume potentiometer is 100KA type 27 ALPS potentiometer, other impedances can be required, the impedances that can be selected are: 100KA, 250KA.
Select the function of the board
1: Four-way signal input selection2: Combine machine and pure post-stage selection, with recording output function.2.1: When the function switch is selected to the left, it is the function of the combiner. The signal will be used through the built-in pre-amplifier. The potentiometer can control the volume. The recording output signal is not controlled by the volume potentiometer, but is controlled by the signal selector control.2.2: When the function switch is selected as the right side, it is pure post-level use, and the signal is input from a separate RCA socket and will not pass through the signal selector or potentiometer. Please use the previous level. At this time, the recording input terminal outputs the signal of the built-in preamp, that is to say, at this time, the output of the recording is the signal of the built-in M2 preamp of 300B, that is, it can be used as an independent preamp.3: Balanced potentiometer control4: Volume potentiometer control