Akai X-200D

(i
recording head
(4)
I
2 ______ __ _
4 -
3
2 ---------
3 _ _______ _
, ..., ...... 4
Dlaaram 1. O rdinary recording system.
Diag ram 2. Cro ss -f le ld recording syst em
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CROS S !"Ir. LO HE AD
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BIAS
4-TRACK MONAURAL RECORDING/ PLAYBACK
Monaural recording /playback track scQucncc should be l ·4·3·2.
(A) Set the TRACK SELECTOR to "'1 •4"'. The fir st monaura l recording/play•
back occurs on t rack I. and the second on t rack 4 after the reels have
been inver ted.
(BJ Invert t11 e reels.
(C) Set the TRACK SELECTOR to "'3·2'".
The th ird mo naural re cording /playback occur s on track 3. and the four th
on tr ck 2 af ter the roels have been inve r ted .
The X- 2000 does not record in tho reverse direction . Using r ev rse play-
back, it Is not necessary to turn the tape r ee ls over. When the X-200 0
begins rever se pl ay back. the re1:ord/playback head Is automatic ally shirted
to the remainin g tracks.
5. CROSS-FIELD HEAD
AKAl"s exclusive cross -field head ha s created a se nsat i on In the tape recorder
world by offering a wide recording range wh ich has never been duplicated.
Using t11ls cross- held head, Model X- 2000 provides a surpris ing recording per•
formancc (30 26 . 000Hz ± 3db at a tape speed of 7•1 /2 1p s.)
Ylhy is cro ss-field recording superior? How does it di ffer from conventional
recording methods ? ·
In th e typical re cording system, the si gnal current and the bias cur rent are
combined and applied to til e recording head. (Diagram 1.)
It is well known th at the bias current is to minimize distortion while mainta in•
ing a proper sensitiv ity rat io.
However, the bias current providing such an advantage al so has an undeslra•
blo effect . Tha t is, the wi de magneti c field of th e bias cur r ent affects tho
recorded signal, resu ltlng in the weakening or oven erasing of t he signal.
This is partic ul arly not ic eable at high freQuencies. In the cross field system.
the sig nal current is applied to the recording head wh ile the bi as c urr ent is
applied to tho bias head.
These two heads are posit ioned inter- relatively, so th at the magnetic field of
the bias w ill not affect the signal recorded on the tape, oven when max im um
bi as is applied. This perm its recording wi th hi gh fideli ty even at low speeds .