AKAI AS-980
¥ 200,000 (around 1973?)
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 |