Audio Database

Image of DA-R300
Commentary

Solid-state integrated amplifier with all stages directly connected.

The power amplifier section employs an all-stage direct-coupled OCL circuit that uses a differential amplifier and removes the coupling capacitor from the output circuit, thereby greatly improving the frequency characteristics and damping factor.

A loudness control circuit is adopted so that it can be enjoyed even at low levels.

It has a microphone mixing circuit.

In the tuner section, a ceramic mechanical filter and IC are used in the FM intermediate frequency stage to improve selectivity characteristics.
A mechanical filter is also used in the AM circuit, and a ferrite bar antenna and filter realize high sensitivity reception.

A muting switch is installed to suppress unpleasant noise during channel selection.

Model Rating
Type Solid-state integrated amplifier
Amplifier Unit
Maximum effective power 15W + 15W (8 Ω, 0.5%)
Damping factor 25 or More (1 kHz)
Cross modulation distortion factor 0.3% or less
Frequency characteristic 20 Hz to 20 kHz ± 0.2 dB
Crosstalk 55 dB or more
Signal-to-noise ratio Phono : 64 dB or more
Tape, P. B : 77 dB or more
Input sensitivity Tape:100mV
Phono:2.5mV
Mic:1mV
P.B.:250mV
Tone control Bass : 100 Hz, ± 10 dB
Treble : 10 kHz, ± 10 dB
Loudness control 100 Hz : + 8 dB, 10 kHz : + 4 dB
FM Tuner Section
Receiving frequency 76 MHz to 90 MHz
Sensitivity 2.0 μ v (IHF)
Distortion factor 0.6% or Less (400 Hz)
Signal-to-noise ratio 60 dB or more
Frequency characteristic 20 Hz to 16 kHz
Capture ratio 2.0 dB or less
Effective selectivity 60 dB or more
Image interference ratio 60 dB or more
Stereo separation 35 dB or More (1 kHz)
<AM Tuner Section>
Receiving frequency 525 kHz to 1,610 kHz
Sensitivity 18 μ V or Less (IHF)
Image interference ratio 50 dB or more
Selectivity 35 dB or more
Signal-to-noise ratio 45 dB or more
<General>
Accessory circuit FM muting
Signal meter
SCA Filters
Mechanical filter
Automatic switching between FM mono and stereo
AM bar antenna
FM stereo indicator
Tape monitor
Loudness control
Stereo headphone jack
Pwer 100 VAC, 50Hz/60Hz
Power consumption 47W
External dimensions Width 452x Height 130x Depth 330 mm
Weight 8.8kg