Audio Database


Nakamichi BX-125
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.

RP-2G E-2D

Rating of a mode
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
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)
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
Weight About 5kg