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| Nakamichi BX-125 |
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| 69,800yen(around the 1985 time) |
The basic cassette deck which also stopped the
functionality to necessary minimum in addition to a simple stream composition
called two heads and a single capstan.
For a part to have made it simple and
sound, a total balance is investigated and it is made.
In the magnetic
recording reproducing head, the effective gap width of a head is set as 1.2
microns which is a 20kHz play threshold, and also the sender strike which has
high saturation magnetic flux density called 10,000gauss in core material is
used so that the property of a sound recording and each play may maintain the
optimal balance.
In the Nakamichi, the manipulation which does not apply any
stress to core material was performed, and also strict and careful manufacturing
control, such as performing the special process of a distorted preventing,
whenever one process finishes, was carried out, and the play capacity to clear
20kHz by keeping the linearity of a gap severe is acquired.
Moreover, by
adopting original hyperbolic (hyperbola) form, a contour effect is held down to
a relative minimum and the low-pass surge is decreased.
The double gap type using the ferrite which was excellent in the RF property as core material is adopted as the erase head.
The cancellation ratio also with expensive
coercive force and metal tape with big residual magnetic flux density which has
little RF loss is secured.
An amplifier part considers the pattern and
circuitry of the printed circuit board of L/R as a perfect symmetrical design, and consideration of arranging by L/R to the length of a part property balance
or signal shielding wire is carried out.
Moreover, one coordination covering
30 items or more is all carried out by a manufacturing process, and the total
quality is raised.
In the sound-recording amplifier part, since the
property of a head is good, the amount of build-outs can be lessened, as a
result, sufficient margin is secured, and the flat frequency characteristic is
maintained.
Moreover, low-distortion-ization is attained. The distorted occurrence
by a capacitor is suppressed by giving respectively separate NF loop of
a direct current component and an alternating-current component. And the
double NF circuitry which aimed at the improvement in a direct-current
stability is adopted.
Furthermore, high-slew-rate low-noise operational amplifier is
adopted as the amplification stage, and the distorted reduction is performed.
The double NF circuitry is carried in the play amplifier part as well as
a sound-recording amplifier part, and the improvement in constant
distorted-izing and a direct-current stability is aimed at.
In the
mechanism part, the removal of the "flutter" is set on the greatest point in the
design of a transport mechanism.
By the single capstan scheme, since the
rotation precision of the reel motor for rolling up is greatly related to a
flutter, while adopting a highly efficient motor, the pulley was made into the
high metal of roundness, and even if it faces a power propagation, the
occurrence of the flutter is prevented BX-125.
Moreover, the oscillation is eliminated by fixing a cassette to a reference
position firmly.
The silence mechanism original with a Nakamichi is adopted.
This
does not use any plunger for a mechanism drive, but the exclusive motor of a
microprocessor control is a scheme which drives the control cam of the head base
or a brake of operation, and all operations start quickly only by touching an
operation button lightly.
The damage to the tapes is stopped by making especially the riser of a
Play operation into the two-step type in variable speed which slows down
when moving speedily and contacting until just before a head contacts a
tapes.
The double-speed master fader control which can choose the fade-in/fadeout of the two-step for 4 seconds and for 2 seconds is carried.
An auto-repeat functionality, a Dolbey B-C type NR system,
wide scale light emitting diode peak level meter,The functionality of hosts,
such as a MPX filter, a memory stop, timer Lec / play functionality, a L/R
independent sound-recording level control, an output volume, 3 position tapes
selector, an equalizer selector, a headphone jack, and a one-touch Lec pause, is
carried.
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| Form |
Stereo cassette deck |
| Head |
Two heads (erasure x1, recording-play
combination x1) |
| Motor |
<Tape transport>
For a capstan
drive: DC servo motor
For a reel drive: DC motor
<Mechanism>
For a cam drive: DC motor |
| Wow and flutter |
0.06%or less WTD RMS
±0.11%or less WTD
Peak |
| Frequency characteristic |
20Hz - 20kHz (recording level -20dB)
|
A comprehensive S/N ratio
(70 microseconds, ZX tapes, 400Hz, 3%THD)
IHF A-WTD RMS) |
Dolbey C type NR on: 68dB or more
Dolbey
B type NR on: 62dB or more |
| A comprehensive distortion (400Hz, 0dB)
|
ZX, an EXII tapes: 1.0% or less
SX
tapes: 1.2% or less |
| Input sensitivity/impedance |
50mV / 30kohm |
An Output voltage/impedance
(400Hz, 0dB,
output level maxima) |
Line: 0.5V/2.2kohm
Headphone:
2.2mV/eight ohms |
| Power source |
AC100V, 50Hz/60Hz |
| Power consumption |
A maximum of 17W |
| Dimensions |
Width 430x height 100x depth of 250mm
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| Weight |
About 5kg |
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