View ba7274s datasheet:

Video ICs 4-channel video-signal PRE / REC amplifier BA7274S The BA7274S PRE / REC amplifier has been designed for use in video cassette recorders. It is compatible with four- head decks, and has four head amplifiers, a chroma output amplifier, and FM output amplifier (with AGC circuit), an envelope detector, a fixed-current drive recording amplifier, a channel switch circuit, and record / playback switch integrated only one monolithic IC. Applications • VCRs Features • 1) Suitable for 4-head decks. system to minimize change in the recording current 2) Integration of the head-section signal processing cir- due to load fluctuation. The maximum recording cur- cuits (REC and head amplifiers, AGC, and envelope rent output is a large 30mAP-P. detector) only one IC allows compac