The length of the air
gap acquires in this type of heads a paramount importance, since it must be
very small to be able to "read" the high frequencies contained in the
tape.
On the other hand, in order to obtain a good signal-to-noise ratio it is
necessary to increase the surface of the air gap and therefore its length. A
middle ground must therefore be adopted.
Usually a reproduction head has air
gaps between 3 and 5 μm. The winding is of low impedance and the
shielding system must offer a very effective protection against the parasitic
field intensities.
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