Zoomlion F-9500A preamplifier (b)

Figure 3-2 (b) is the second half of the circuit. VT17 ~ VT31 form
the post-amplifier, which has the same structure as the pre-amplifier. IC2 and others form its zero-point servo circuit.
A series attenuated tone control circuit is inserted between the front and back stage amplifiers, and a two-position control switch is connected . It can control the tone
circuit or form a direct pass through the front and back stage amplifiers without going through the tone circuit. At the end of the amplifier, the volume potentiometer is used. Fusion) 5 and RC network form an interface with four outputs:
recording, ordinary (connected to the power amplifier circuit), high-pass, and low-pass .