||DT-4700: 71,800yen(around the 1978 time)
|DT-4700S:69,800yen(around the 1979 time)
It is a stereo cassette deck which carries many new mechanisms in which
the recording function was thought as important.
DC servo motor is adopted as a drive motor.
The tape run where the built-in
tachogenerator stopped the unevenness of tape speed, and was stabilized also to
the load fluctuation leading to a wow and flutter with the system which always
controls number of rotations to the degree of fixed speed is enabled.
Record master volume is carried. This volume can adjust the level of the
recording signal from all the input terminals, without moving the input
regulation knob of Line or Mic.
The super-low-noise PNP epitaxial
silicon transistor which the Diatone developed is adopted as the play equalizer
amplifier first rank. Moreover, the low-noise PNP transistor is adopted as the
first rank of Line input amplifier.
Improvement in the characteristic is
aimed at by using the ferrite head selected carefully for a head.
residual quantity directions meter is carried.
This meter detects first the
number of rotations of a supply side reel rest, carries out voltage conversion
of it, and is making meter shake. For this reason, change of the rotation cycle
of a supply side reel rest turns into change of the deflection which is meter, and is appearing.
Moreover, this tape residual quantity directions meter
carries the reference-voltage generating equipment which uses a zener diode, and
a temperature guarantee circuit, corresponds to power-supply-voltage change or a
surrounding temperature change, and enables exact directions.
recording is possible.
The peak level indicator which will be turned on if the level (+5Vu) from which distortion begins is reached is carried.
The memory rewind
mechanism is carried. A memory switch is turned ON beforehand, and if the REW
button is pushed, it can be made to stop automatically in the place rewound to
999, if a tape counter is set to 000 and set before performing recording or a
The L/mono microphone jack mechanism is carried. If a microphone plug is
inserted in Lch of a microphone jack, it will be automatically recorded
by both channel by a monophonic recording.
By connecting with an option
audio timer, absence recording, an alarm clock play, etc. are possible.
The tape lighting lamp is carried in the cassette case.
ejection mechanism of an oil dumping type is carried.
The Dolbey circuit
There were two kinds, DT-4700 which carries the carrying
handle for rack-mounted one, and DT-4700S not carrying a
||Four trucks [ two ]
||A DC servo motor with a built-in
||For Recording plays: Ferrite head
elimination: Ferrite head
|Magnetic tape velocity
|Fast forward / rewinding time
||It is C-60 tape and is about 90 seconds.
|Wow and flutter
||30Hz - 15kHz (normal tape)
30Hz - 17kHz
|Signal to noise ratio
||Dolby out: 56dB or more
Dolby in: 64dB
|Bias oscillation frequency
|An Output voltage/impedance
||Line: -7dB /, 22kohm
||DT-4700: Width 424x height 154x depth of
DT-4700S: Width 480x height 154x depth of 323mm