Overview
The LA7411 and LA7411M are playback and record amplifier IC for two-head VHS VCRs. When used in conjunction with the video signal processing ICs of the LA7420/30 series, it is possible to eliminate the need to adjust the Y/C record current.
   
Features
• The record amplifier provides stable record characteristics in
    constant current drive mode, which is able to withstand load
    fluctuations. In addition, the built-in AGC eliminates the
    need to adjust the record current.
• Designed to share printed circuit boards with the
    LA7416/7416M (for 4-head systems).
   
Functions
• 2-channel playback amplifier.
• 1-channel record amplifier.
• REC/PB mode switching head switch circuit.
• Envelope wave detection (for auto-tracking).