Audio Database

The

Nakamichi BX-1
59,800yen(1982 release)

Description
 
The stereo cassette deck which pursued the new value which is not in a restraint of a price point until now, and attained high-quality sound-ization.
In order to pursue a tone quality, the member which carries only a necessary minimum function and has an ill effect on a tone quality is eliminated.

While adopting a double NF circuitry and attaining a distorted reduction and a direct-current stabilization, the loss correction of the strict head based on a theoretical value is carried out to the sound-recording equalizer amplifier. Moreover, the dynamic range is earned using highly efficient low-noise operational amplifier.
Moreover, the play equalizer amplifier has also adopted the double NF type, chooses the reproducing head and a congenial transistor, and is making them the discrete stream composition.

In order to prevent distorting the wave of a bias current, or modulating a music signal because a voltage is unstable, and causing a tone-quality failure, while putting a constant-voltage regulated power supply into a bias oscillator circuit, wave distortion is suppressed using the circuitry extravagant with an oscillator.
Moreover, a bias adjustment mechanism for exclusive use is prepared in the interior of a set for every tapes position of the right-and-left channel ZX, SX, and EX, and it is adjusting to the best bias.

The 1.2micro gap high bias recording-play combination head which made the contact surface with a tapes the shape of a hyperbola (hyperbolic form) is adopted as a head.

In the mechanism part, the motor in which the precision of the motor for rolling up has the orderly bearing paying attention to affecting a flutter is used. Metal roundness makes a pulley etc. high and the flutter is kept from coming out of it also in the stage of a power propagation.
Moreover, the microprocessor for exclusive use is adopted as a mechanism control, a current situation is judged from the status of the cam attached to the mechanism, and a processor issues a verb and is operating the motor.

One coordination of about 30 items is all carried out, and BX-1 produced is suppressing the variation for every product.

The equalizer switchpoint of two positions is carried and two positions for 120 microseconds and 70 microseconds can be chosen.

light emitting diode peak level meter is carried, and it can check in a span of -30dB - +5dB.

The sound-recording balance and the sound-recording master volume are carried.

Mechanism
Head Microprocessor

Rating of a mode
Form Stereo cassette deck
Track form 4 track two-channel stereophonic system
Head Recording-play x1
Erasure x1
Motor (for tape transports) For capstans: DC servo motorx1
For reels: DC motor
Tape speed 4.8cm/s
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 (IHF-A) DolbyNR B on: 62dB or more (ZX tapes, 70 microseconds, 400Hz, THD 3%, WTD RMS)
A comprehensive distortion 1.0% or less (400Hz, 0dB, ZX, EXII tapes)
1.2% or less (400Hz, 0dB, SX tapes)
Cancellation ratio 60dB or more (100Hz, 0dB)
Channel separation 36dB or more (1kHz, 0dB)
Crosstalk 60dB or more (1kHz, 0dB)
Bias frequency 105kHz
Input sensitivity/impedance 50mV / 30kohm
An Output voltage/impedance Line: 0.5V (400Hz, 0dB) / 2.2kohm
Headphone: 1.2mW (400Hz, 0dB)/8ohm
Power source AC100V, 50Hz/60Hz
Power consumption A maximum of 23W
Dimensions Width 430x height 110x depth of 250mm
Weight About 5.5kg