Audio Database

The

Nakamichi 1000ZXL
550,000yen(1980 release)

Description
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1000/1000IBM PCN II which is proud of a track record (as for pros) all over the world are the super-class models improved extensively.

In order to adjust the small difference in the optimal bias value which exists for every tapes, a sensitivity, etc., A.B.L.E (Azimuth, Bias, SFT Level, Equalizer) is carried.
This is a microcomputer with the resolution of an eight-bit, and is performing a broad coordination called 256 steps in a bias, level, and an equalizer according to the right-and-left channel, respectively. Thereby, it corresponds to all tapeses and the tapes selector is not needed.
Moreover, the tapes adjusted by this has realized the high spec of 20-20000Hz}0.75dB (18-25000Hz}3dB) in the frequency characteristic in a recording level of 20dB.

The play system RAMM (Ramdom Access Music Memory) which can play the music currently recorded by the tapes in an order different or favorite sequence is carried. This records the music-number address signal coded by the microcomputer one by one during a sound recording. It is a system reproduced as the music number which read this code at the time of a play, and was programmed by the listener.
Moreover, whether external connection noise reduction's, such as in/out's of the playback-equalizer position's (70 microseconds'/'s120microsecond's) set up at the time of a sound recording and the Dolbey noise reduction or High-ComII's, being used and an intelligence are recorded simultaneously. When playing the tape in which the RAMM code signal was recorded by this, the operation of a playback-equalizer switchpoint and a noise reduction switchpoint has become unnecessary.
The code signal uses the frequency very low-pass of 5}0.1Hz. since play sound is not affected.


In order to expect a reduction of the modulation noise generated by the elasticity of a tapes, or the friction with a head and to obtain a stabilization of a tapes run, equalization of a tape tension, the stable head touch, etc., the double capstan scheme was adopted and the tapes pad softer is equipped.
Furthermore, 2 capstan diameters are stopping the noise because a flutter periodicity avoids that a flutter periodicity overlaps unlike the supply side is 3mm and the take-up side is 2.5mm.

In order to brake a motor and the oscillation produced from body of revolution in addition to this, a chassis adopts the big aluminum alloy of a damping characteristics far compared with iron. The structure which carried out the outsert of the resin to this was taken, Kyushu of the harmful fine oscillation was carried out, and the occurrence of a vibration is prevented.

The tapes control by a C-MOS logic is adopted, and the unique method of driving a cam by a motor is taken like an electronic control not using the solenoid plunger.
Thereby compared with a plunger drive, operation sound is very low. Since a tapes can be contacted soft, it is possible to stop the damage to a tapes or a tape transport few. There is no temperature rise inside the plane. There is little electric-current consumption and it ends. Which merit is obtained.

A discrete and 3 head schemes are adopted as a head.
The P-8L type reproducing head is adopted as the reproducing head. Moreover, using a lamination coulisse ƒ^ƒƒC corr, it was miniaturized, and also much losses which take place at the time of a play are abolished about the narrow gap of 0.6 micron, and the play of the high region which amounts to 25kHz is enabled.

The R-8L type recording head is adopted as the recording head. About a 3.5-micron gap with the lamination core of Krista Roy, a life is the same as the reproducing head, and has secured 10,000 hours or more.

The E-8L type erase head is adopted as the erase head. It is a double gap of the ferrite core which used the sender strike for the front. Moreover, the bias current of small permission is using a divide and 52.5kHz for the frequency from the bias oscillator which used Quartz for one half. Thereby, the eddy-current (overcurrent) loss of the erase head decreases. The erasure electric current could be made to increase and the erasure effect has risen greatly. Moreover, the cancellation ratio in low-pass is improved remarkably.

Between the reproducing head and first rank amplifier was adopted as play amplifier, the double NF circuitry was adopted as the hardwired connection and the equalizer circuitry, and the stabilization of a direct current and the distorted reduction are aimed at.

A hardwired connection and a double NF circuitry are used for a sound-recording equalizer amplifier for ensemble amplifier and the recording head, and it is reducing the distortion at the time of a sound recording. A sound-recording input takes the scheme which can mix L, R, the microphone input of three points of a blend (center), and a line input, changes independent or these 2 simultaneously, and can use a Subsonic Filter and a MPX filter.

The pitch control functionality in which the rotational speed of a tapes can be changed is carried. In this functionality, it can carry out variable in }6% of span.

According to the status of a music source, a bias current can be changed to three sorts of Under/Normal/Over, and a MOL (maximum output level) property can be changed, without changing the frequency characteristic.

L channel, R channel, three microphone inputs of a blend (center), and mixing circuitry built-in of a line input.

The Dolbey noise reduction is built in. Moreover, the contact button of external noise reduction, such as High-Com IBM PCN II, is prepared, and it is a switchover possible by the switchpoint of the front panel.

High-output headphone jack loading.

The
Block

Rating of a mode
Form Stereo cassette deck
Track scheme 4 track 2ch
Head stream composition An erasure, a sound recording, play independent 3 head
Motor PLL servo x1 for capstans
x1 for the reeled live
Tape speed 4.8cm/second
Wow and flutter 0.04%or less Wrms
0.08%or less Wpeak
Frequency characteristic (A. B.L.E using) 20Hz-20000Hz}0.75dB
18Hz-25000Hz}3dB
(Nakamichi EX, EX IBM PCN II, SX, ZX tapes, a recording level of 20dB)
A comprehensive S/N ratio 66dB or more (3%THD)
60dB or more (0dB)
(IHF-A, Wrms, 400Hz, Dolby NR, ZX tapes, 70 microseconds)
A comprehensive distortion 0.8% or less (ZX tapes)
1.0% or less (SX, EX IBM PCN II tapes)
(400Hz, 8dB)
Cancellation ratio 60dB or more (100Hz)
Channel separation 37dB or more (1kHz, 0dB)
Bias frequency 105kHz
Input 50mV 50kohm (line)
0.2mV 10kohm (microphone)
100mV 50kohm (noise reduction)
Output 1V (400Hz, 0dB, an output level maxima, line)
45mW (400Hz, 0dB, an output level maxima, microphone)
100mV, 2.2kohm (noise reduction)
Tapes selector Automatic regulation (a manual switching, three steps of biases, two steps of equalizers)
An attached organization Automatic-regulation A.B.L.E of an azimuth, a bias, level, and an equalizer.
RAMM (automatic head-search organization)
Power source 100V 50/60Hz
Power consumption A maximum of 60W
Dimensions Width 522x height 258x depth of 322mm
Weight About 19kg
Option Remote Control unit RM-300 (28,000yen)
NR-100 (it corresponds to the Dolbey C type)