Audio Database


An FM/AM stereo receiver with a built-in matrix 4-ch circuit that connects two tape decks and a microphone.

The main amplifier section uses a fully connected OCL circuit that uses a differential amplifier circuit at the first stage.

The equalizer stage employs a 2-stage direct connection configuration with low-noise PNP transistors, and bias current is also stabilized by applying DC NF.

The tone control circuit configuration uses the NF circuit of the main amplifier section. The feedback amount of the NF loop at the first stage of the main amplifier section is attenuated by frequency and controlled.
In this method, since the signal is manipulated after amplification, the distortion generated in the tone control circuit is minimized.

The front-end of the FM tuner section employs an FM3-row varicon and a 4-pole MOS FET to achieve stable high gain and high sensitivity. The IF amplifier stage consists of six stages using three differential stages, and three 2-element ceramic filters are used as selection elements to achieve 60 dB selectivity.
The MPX circuit uses a monolithic IC and a sealed coil unit to eliminate the influence of temperature and humidity.

The antenna is equipped with coaxial cable terminals and a highly reliable design that uses balloon for impedance conversion.

Two pairs of tape monitor circuits are installed, allowing simultaneous recording and dubbing of two devices.

It has a built-in matrix circuit that converts 2 ch signals into 4 ch signals.

Model Rating
Type FM/AM stereo receiver
Amplifier Unit
Music Power (IHF) 46W (4 Ω)
37W (8 Ω)
Effective power (IHF) 16W/16W (4 Ω)
14W/14W (8 Ω)
Power band wiz 7 hz to 30 khz + 1 -3dB
Frequency characteristic 10 Hz to 50 kHz + 1-3 dB
Total harmonic distortion factor 0.8%
Cross modulation distortion factor 1.0% (at 60 Hz : 7 kHz = 4 : 1, effective output)
Signal-to-noise ratio (IHF) Phono:70dB
Damping factor 30 or More (8 Ω Load)
Input Sensitivity / Impedance Phono : 3mV/47k Ω
Mic : 3mV/47k Ω
Tape Playback : 200mV/30k Ω
Output level Rec out:200mV
Tone control Bass : + 10 dB ~ -12dB (50 Hz)
Treble : ± 10 dB (10 kHz)
Loudness control + 12 dB (50 Hz), + 5 dB (10 kHz)
FM Tuner Section
Receiving frequency 76 MHz to 90 MHz
Sensitivity (IHF) 1.9 μ V
Selectivity (IHF) 60dB
Signal-to-noise ratio (IHF) 65dB
Capture ratio 2.0dB
Image interference ratio 40dB
IF interference ratio 85dB
AM suppression ratio 45dB
Stereo separation 35dB
Total harmonic distortion factor 0.4%
<AM Tuner Section>
Receiving frequency 520 kHz to 1,610 kHz
Sensitivity (IHF) 20 μ V
Selectivity 20dB
Image interference ratio 50dB(1,000kHz)
Semiconductor used IC : 1
FET : 1
Transistor : 38
Diode : 19 units
Pwer 100 VAC, 50/60Hz
Power consumption 52W
External dimensions Width 410x Height 135x Depth 358 mm
Weight 8kg