Audio Database

The

DIATONE DA-R300
49,800yen(around the 1972 time)

Description
 
It is the solid-state synthesis amplifier which adopted the whole page direct connection circuit.

In the power amplifier part, the whole page direct connection OCL circuit which removed the coupling condenser from the output circuit using the differential amplifier is adopted. This has improved the frequency response, the dumping factor, etc. sharply.

The loudness control circuit is adopted so that he can enjoy himself also with small volume.

The microphone mixing circuit is carried.

In the tuner part, the selection degree characteristic is improved by adopting the mechanical filter and IC by ceramics as FM intermediate frequency stage.
Moreover, the mechanical filter is adopted also as AM circuit and the ferrite bar antenna and the filter have realized high sensitivity reception.

The muting switch is carried in order to suppress the unpleasant noise under tuning.


Rating of a mode
Form Solid-state synthesis amplifier
<Amplifier part>
Effective maximum except take-off 15W+15W (8 ohms, 0.5%)
Dumping factor 25 (1kHz) or more
Cross modulation distortion 0.3% or less
Frequency response 20Hz-20kHz±0.2dB
Cross talk 55dB or more
Signal to noise ratio Phono: 64dB or more
Tape, P.B: 77dB or more
Input sensitivity Tape:100mV
Phono:2.5mV
Mic:1mV
P.B.:250mV
Tone control Bass: 100Hz, ±10dB
Treble: 10kHz, ±10dB
Loudness control 100Hz : +8dB, 10kHz : +4dB
<FM tuner part>
Received frequency 76MHz - 90MHz
Sensitivity 2.0microv (IHF)
Distortion 0.6% or less (400Hz)
Signal to noise ratio 60dB or more
Frequency response 20Hz - 16kHz
Capture ratio 2.0dB or less
The degree of effective selection 60dB or more
Image disturbance ratio 60dB or more
Stereo separation 35dB or more (1kHz)
<AM tuner part>
Received frequency 525kHz - 1,610kHz
Sensitivity 18 microvolts or less (IHF)
Image disturbance ratio 50dB or more
The degree of selection 35dB or more
Signal to noise ratio 45dB or more
<Synthesis>
An attached circuit FM muting
Signal meter
SCA filter
Mechanical filter
FM mono-<=> stereo automatic change
AM bar antenna
FM stereo indicator
Tape monitor
Loudness control
Stereo headset jack
Power source AC100V, 50Hz/60Hz
Power consumption 47W
Dimensions Width 452x height 130x depth of 330mm
Weight 8.8kg