This post explains for the amplifier.
The Part Number is AN7062. The Package is DIP 18 Pin Type.
The function of this semiconductor is High Voltage Input Amplifier IC.
Preview images :
This is High Voltage Input Amplifier Circuit for Hi-Fi Power Amplifier.
The AN7062 is a high voltage integrated circuit designed for pre-driver of 60W-class Hi-Fi audio amp.
Stereo operation is enabled due to two amplifiers built-in.
1. High voltage
2. Low noise : Vni = 2.5μV (typ.)
3. Low distortion : THD = 0.003% (typ.)
4. Good channel separation
5. Wide operating supply voltage range