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SMR-5240
Commentary

A 4-channel stereo receiver developed using semiconductor and circuit technologies.

Built-in regular matrix (RM) and SQ matrix circuits.

The 4-channel power amplifier section consists of a quasi complimentary service OCL circuit.
The BTL connection allows the power amplifier to play back a sound with a margin when two channels are used.

The FM tuner uses a MOS-FET in the front end to achieve stable reception with low noise and reduced interference. The intermediate frequency amplifier uses a mechanical filter and IC with sharp performance.
A switching system is adopted for the MPX circuit.

Equipped with a pair microphone mixing circuit.

Model Rating
Type 2ch/4ch Receiver
Power Amplifier Unit
Effective power 4 ch : 10Wx4 (8 Ω, 1 kHz)
2ch:25W+25W
Dynamic Power (IHF) 4 ch : 65W (8 Ω)
2 ch : 75W (8 Ω)
Total harmonic distortion factor 1% (at rated output)
0.2% at rated output of -3dB
Cross modulation distortion factor 0.5% (at 1/2 rated output)
Output bandwidth 20 Hz to 30 kHz
Frequency characteristic 20 Hz to 20 kHz ± 1 dB
Damping factor 25 (1 kHz, 8 Ω)
Preamplifier Section
Input sensitivity Phono : 3 mv (2 ch), 200 mv (4 ch)
Aux, Tape : 200 mv
Mic:3.5mV
Tone control Bass:+11dB -16dB(100Hz)
Treble : ± 13 dB (10 kHz)
S/N Phono:60dB
Aux:70dB
FM Tuner Section
Receiving frequency 76 MHz to 90 MHz
Practical sensitivity (IHF) 2 μ V
Capture ratio 1.2dB
Selectivity 46dB
S/N 64dB
Harmonic distortion factor mono:0.3%
stereo:0.8%
Stereo separation 38dB(1kHz)
<AM Tuner Section>
Receiving frequency 530 kHz to 1,605 kHz
Practical sensitivity (IHF) 20 μ V
Selectivity 35dB
S/N 46dB
<General>
Semiconductor used Transistor : 57
FET : 1
IC : 3
Diode : 24 units
Power supply voltage 100 VAC, 50Hz/60Hz
Rated power consumption 75W (Electrical Appliance and Material Control Law)
External dimensions Width 490x Height 136x Depth 390 mm
Weight 9.6kg