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AKAI M-9 · M-9DX
3.
CROSS-FIELD HEAD
Cross-field head creates a sensation m the tape recorder world by making a wide range of recording which has never been heard
before of any tape recorder.
Using this cross-field head, Mode! M-9 (M-9DX) provides a surpnsmg recording performance (30-23,000 eps at a tape speed of 7-l/2
ips, 30-18,000 eps at 3-3/4 ips and 30 to 9,000 eps at l-7 j8 ips).
What
is
superior about cross-field recording? How does it differ from typical recording methods as far as construction is concernee!
)
On these, explanation is given below in sequences:
ln the typical recording system, the signal current and the bias current are combinee! together and applied to the recording head.
(Refer to Diagram
l.)
It is weil known that the purpose of bias current is recording at high sensitivity with a signal applied on the tape, with no distor-
tion and minimizing noise generation.
However, the bias current providing such an advantage also has an undesirable character.
That is, the wide magnetic field of the
bias current affects the recordee! signal, resulting in weakening or even erasing the signal.
This phenomenon is particularly notice-
able at high frequencies.
In the cross-field system, the signal current is applied
to
the recording head while the bias current is applied to the bias head.
These two heads are located in different positions, as determinee! inter-relatively, so the magnetic field of the bias will not affect
the signal recordee! on the tape, even when a sufficient bias is applied. This allows the recordee! signal to remain on the tape with
high fidelity.
Diagram l. Ordinary recording system
Diagram 2. Cross-field recording system
1
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