Finnegan, Henderson, Farabow, Garrett & Dunner, L.L.P.
Record amplifying circuit for respectively serially and differentially driving sets of series-connected sound and video record heads
 A DC feed-back circuit for causing a DC voltage of an external transistor in which an output bias current of a record amplifier flows to be equal to a DC voltage of an output terminal is provided so as to decrease power consumption. Thus, a plurality of record amplifying circuits can be incorporated into one IC chip. In particular, in home-use Hi-Fi VCRs, a Hi-Fi record amplifying circuit and video record amplifying circuits can be incorporated into one chip. 
Kabushiki Kaisha Toshiba
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