Audio Database

The

DIATONE DT-4700/DT-4700S DT-4700: 71,800yen(around the 1978 time)
DT-4700S:69,800yen(around the 1979 time)

Description
 
It is a stereo cassette deck which carries many new mechanisms in which the recording function was thought as important.

The 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.

Tape 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.

Mixing 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 play.

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.

The soft ejection mechanism of an oil dumping type is carried.

The Dolbey circuit is carried.

There were two kinds, DT-4700 which carries the carrying handle for rack-mounted one, and DT-4700S not carrying a

The
Tape

Rating of a mode
Form Cassette deck
Truck form Four trucks [ two ]
Motor A DC servo motor with a built-in tachogenerator
Head For Recording plays: Ferrite head
For elimination: Ferrite head
Magnetic tape velocity 4.75cm/s
Fast forward / rewinding time It is C-60 tape and is about 90 seconds.
Wow and flutter 0.06%(WRMS)
Frequency response 30Hz - 15kHz (normal tape)
30Hz - 17kHz (chromium tape)
Signal to noise ratio Dolby out: 56dB or more
Dolby in: 64dB or more
Bias oscillation frequency 85kHz
Input sensitivity/impedance Mic: -72dBV/2.2kohm
Line: -22dBV/91kohm
An Output voltage/impedance Line: -7dB /, 22kohm
Headphone: -21dBV/8ohm
Power source AC100V, 50Hz/60Hz
Power consumption 13W
Dimensions DT-4700: Width 424x height 154x depth of 310mm
DT-4700S: Width 480x height 154x depth of 323mm
Weight DT-4700:9.5kg
DT-4700S:9kg