RECORDING AND PLAYBACK HEADS
In a stereo cassette recorder, tape decks (with the exception of some of those used with the so called professional equipment) combine the duties of recording and reproduction in a common head. The requirements of the recording and the playback heads are fundamentally the same and, as they are not required simultaneously economy is served by combining them.
Modern heads are usually constructed of two semicircular stacks of high-permeability laminations of about half to one inch in diameter. The stacks are assembled symmetrically with a head gap (against which the tape passes) of about five to ten thousandth of an inch or less, and an auxiliary gap, diametrically opposite the head gap, of about ten times that width. ...
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