DIATONE DA-R300
¥ 49,800 (around 1972)
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 |