This part is a kind of semiconductor called BA3308.

Function of this product has DUAL PREAMPLIFIER.

Manufacturers : UTC

Image and pinout :

Some of the text within the PDF file :

UTC BA3308 DUAL PREAMPLIFIER WITH ALC DESCRIPTION LINEAR INTEGRATED CIRCUIT The UTC BA3308 is designed to have dual preamplifier ICs with built – in ALC circuits for use in stereo amplification. The preamplifiers have high gain and low distortion. A built-in rectifier for ALC circuit implies good channel balance and large dynamic range can be constructed with addition of just an external time constant circuit. SIP-9 FEATURES * Wide operating power supply voltage range (VCC =6.0V ~ 14V) * Power-on mute circuit to avoid “pop” noise generation. * No input coupling capacitors are necessary * High gain (GVO=80dB)and low noise (VNIN=1µVrms) * Low distortion (THD=0.1%) * Good ALC channel balance with built-in ALC rectifier diode * Adjustable ALC dynamic range by external input resistor [ ... ]

BA3308 PDF Datasheet Download