This post explains for the dual amplifier.
The Part Number is JRC4580.
The function of this semiconductor is Dual Operational Amplifier.
Manufacturer: H&M Semi ( www.hmsemi.com )
Preview images :
The JRC4580 is the dual operational amplifier, specially designer for improving the tone control, which is most suitable for the audio application.
Featuring noiseless, higher gain bandwidth, high output current and low distortion ratio, and it is most suitable not only for acoustic electronic parts of audio pre-amp and active filter, but also for the industrial measurement tools. It is also suitable for the head phone amp at higher output current, and further more, it can be applied for the handy type set operational amplifier of general purpose […]
1. Operating Voltage (±2 V ∼ ±18 V)
2. Wide Gain Bandwidth Product (15 MHz typ.)
3. Slew Rate (5 V/μs typ.)
4. Bipolar Technology