Audio Database

The

Nakamichi 700II
210,000yen(1977 release)

Description
 
700 serieses aimed at the thing equipped also with beauty to 1000 serieses which pursued the performance. A performance is not inferior to 1000 serieses, either. These 700IBM PCN IIs were also a few 3 head cassette decks as that time.

By adopting not a permalloy head head but SR head as the reproducing head, it succeeded in the lifetime of a head lengthening.

The crystal ferrite head developed newly is adopted as the recording head.
Since a crystal ferrite head has little RF loss, it is carrying out the bias operation effectively in spite of the bias frequency as high as 105kHz. Moreover, manipulation distortion was removed by the enhancement on a manufacturing process, and the Focus and the good high region property have been strongly acquired for the magnetic field in a very narrow span.

The temperature rise was suppressed by carrying not an AC erasing but the crystal ferrite erase head currently used conventionally in the erase head, and it succeeded in raising an erasure efficiency ratio.
Moreover, this erase head has equipped with the stainless tape guide up and down, and is raising the traveling accuracy of a tapes.

At 700IBM PCN IIs, by adopting the air damper which uses a cylinder, it considers so that a contact of a tapes and a head may be performed slowly calmly.
Moreover, the air damper of a cylinder type is adopted also like an eject of a tapes, and it can carry out variable [ of the eject velocity ] by a needle throttle.

The exact Dolbey level adjustment is possible in 400Hz and a 0dB testing tone.
By a blend mike input, five-channel mixing 3 yuan is possible.



Rating of a mode
Form Stereo cassette deck
Tape speed 4.8cm/second
Wow and flutter 0.05%or less Wrms
Frequency characteristic (A. B.L.E using) 35Hz-20000Hz±3dB
(Dolby system in, SX, EX IBM PCN II tapes)
A comprehensive S/N ratio 65dB
(Dolby system in and WTD rms -- distorted [ 3% ] 400Hz)
(Wrms. -- distorted [ 3% ] 400Hz)
A comprehensive distortion 1.5% or less (400Hz, 0dB)
Cancellation ratio 60dB or more (1kHz, saturation level)
Channel separation 35dB or more (1kHz, 0dB)
Crosstalk 60dB or more (1kHz, 0dB)
Bias frequency 105kHz
Input A mic, a blend mic, a DIN mic: 0.2mV, 10kohm
Line: 50mV, 50kohm
Output Line: 1V
Headphone: 40mW, 8ohms (1kHz, 0dB)
The semiconductor used Transistor: 138 pieces
IC: Nine pieces
Diode: 54 pieces
Power source 100, 117, 220, 240V 50 / 60Hz
Power consumption A maximum of 60W
Dimensions Width 520x height 267x depth of 130mm
Weight About 13kg
Option Remote Control unit RM-10 (9,000yen)