Audio Database
AS-980
Commentary

The highest quality receiver announced as 4chFM/AM total stereo amplifier.
It is designed so that you can enjoy 2 ch stereo and the output is doubled when you switch from 4 ch.

The SEPP-ITL-OTL circuit is used for the power amplifier.
In addition, power supply stabilization circuit and power transistor protection circuit are mounted.

All stages of the preamp section are directly connected, and an NF tone control is built in.
It also incorporates four channel decoder amplifiers for discrete and CD-4 systems, SQ and regular matrix (RM) systems.
In addition to the remote control of surround balance, it is equipped with a 4-channel dubbing jack and an impedance level meter can be installed.

The front end of the FM tuner section is a 2-stage RF amplifier circuit using an FET and a frequency linear 4 series variable capacitor, and excellent interference rejection capability is obtained.
In addition, a ceramic filter and 4-stage direct-coupled IC are used for the IF stage, and an IC and a 15 khz low-pass filter are used for the MPX circuit.

The AM tuner uses a 3-row varicon for the RF stage and a ceramic filter for the IF stage.

Built-in preset volume.

A 2-meter system is used for the tuning instruction.

Model Rating
Type FM/AM integrated stereo amplifier
FM Tuner Section
Receive Frequency / IF Frequency 76 MHz ~ 90MHz/10.7 MHz
Sensitivity (IHF) 2.0 μ V
1.8 μ V (listed in separate catalog)
Harmonic distortion factor Mono : 0.3% or less
0.2% or less (listed in separate catalog)
Stereo : not more than 0.5%
0.6% or less (listed in separate catalog)
Signal-to-noise ratio 70 dB or more
Selectivity 70 dB or more
80 dB or more (listed in separate catalog)
Image ratio 85 dB or More (84 MHz)
IF interference ratio 100 dB or More (84 MHz)
Spurious 34 dB or less
Antenna input impedance 300 Ω Balanced Type, 75 Ω Balanced Type
Stereo separation 40 dB or more
Capture Ratio (IHF) 2.0dB
1.5 dB (listed in separate catalog)
<AM Tuner Section>
Receiving frequency 535 kHz to 1605 kHz
Sensitivity (IHF) Dummy 10dB/1MHz (400 Hz, 30% Mod)
Image ratio 80 dB or More (1 MHz)
IF interference ratio 75 dB or More (1 MHz)
Selectivity 35 dB or more
AM distortion factor Not more than 1.0%
0.8% or less (listed in separate catalog)
Signal-to-noise ratio 50 dB or More (400 Hz, 30% Mod)
Amplifier Unit
Music power 220W (4 Ω)
170W (8 Ω)
Continuous rated output 2-channel specification
60W + 60W (4 Ω)
50W + 50W (8 Ω)
4-channel specification
40W + 40W + 40W + 40W (4 Ω)
30W + 30W + 30W + 30W (8 Ω)
Harmonic distortion factor 0.05% or Less (8 Ω, 20W)
Output Bandwidth (IHF) 20 Hz ~ 50 kHz (8 Ω)
10 Hz ~ 60 kHz (8 Ω, listed in separate catalog)
Frequency characteristic 10 Hz to 60 kHz -3dB
Input Sensitivity / Impedance Phono1 : 1.5mV/50k Ω (CD-4)
Phono2 : 3mV/50k Ω
Aux, Tape Monitor (Din/Pin) : 180mV/100k Ω
MIC : 3mV/50k Ω
Signal-to-noise ratio (IHF) Phono : 80 dB or more
Aux : 90 dB or more
Residual noise 1.0 mV or less
Channel separation Phono : 50 dB or more
Phono input resistance 130mV(1kHz)1%
Equalizer RIAA ± 1 dB
Tone control Bass : 100 Hz ± 10 dB
Treble : 10 kHz ± 10 dB
Loudness control (Volume -30dB) 100Hz:+8dB
10kHz:+5dB
Filter High-cut filter : -6dB, 10 kHz
Low-cut filter : -5dB, 50 Hz
<General>
Semiconductor used FET : 8
IC : 11
Transistor : 129 units
Diode : 75 pcs
Pwer 100 VAC ~ 240 V, 50Hz/60Hz
Power consumption 380W maximum
External dimensions Width 650x Height 155x Depth 365 mm
Width 650x Height 168x Depth 426 mm (listed in separate catalog)
Weight 20.5kg