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| Nakamichi 1000ZXL |
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| 550,000yen(1980 release) |
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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 ^C 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.
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| 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
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| Frequency characteristic (A. B.L.E using)
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20Hz-20000Hz}0.75dB
18Hz-25000Hz}3dB
(Nakamichi EX, EX IBM PCN II, SX, ZX tapes, a recording level of 20dB)
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| 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)
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| Power source |
100V 50/60Hz |
| Power consumption |
A maximum of 60W |
| Dimensions |
Width 522x height 258x depth of 322mm
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| Weight |
About 19kg |
| Option |
Remote Control unit RM-300 (28,000yen)
NR-100 (it corresponds to the Dolbey C type) |
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