This part is a kind of semiconductor called NTE1231.

Function of this product has Integrated Circuit Complete 4 Watt TV Sound Channel.

Manufacturers : NTE

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Some of the text within the PDF file :

NTE1231 & NTE1231A Integrated Circuit Complete 4 Watt TV Sound Channel Description: Capable of carrying out all of the functions of a TV sound channel, the NTE1231 and NTE1231A silicon monolithic integrated circuits consist of a six–stage IF amplifier/limiter, low–pass filter, differential peak detector, DC volume control, regulated power supply, audio preamplifier, and output stage. The audio power amplifier will deliver 4W of low–distortion audio to a 16Ω load with a supply of 24V. When used with a 12V supply, such as is found in many portable TV sets, these devices will furnish 1.5W to an 8Ω loud speaker. The NTE1231 is supplied in a quad in–line plastic package with a copper lead frame. This device is designed to use the printed wiring board on which it is mounted for heat [ ... ]

NTE1231 PDF Datasheet Download