AKAI AA-920
¥ 62,000 (around 1973?)
Commentary
The FM front-end section uses a high-end dual-gate MOS FET and a frequency-linear four series varicon to improve various characteristics. The IF amplifier stage uses an IC and three ceramic filters to improve selectivity and capture ratio.
The AM tuner section uses a 3-row varicon and ceramic filter.
An FET is used in the first stage of the preamplifier section to eliminate distortion caused by impedance deviation, and a low-noise transistor is used in the equalizer section to improve the dynamic range.
The tone control uses an NF type that takes advantage of the linear characteristics of the B-type variable resistor.
The power amplifier section uses a SEPP-ITL-OTL-OCL direct connection circuit.
In addition to two types of dubbing jacks, a microphone jack is installed.
Comes with a preset volume and can be used independently for pre-main and main.
Equipped with a microphone jack.
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 1.9 μ V (listed in separate catalog) |
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Harmonic distortion factor | Mono : 0.4% or less Stereo : 0.8% or less 0.7% or less (listed in separate catalog) |
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Signal-to-noise ratio | 70 dB or more | ||||
Selectivity | 70 dB or more | ||||
Image ratio | 80 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 | 38 dB or more 40 dB or more (listed in separate catalog) |
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Capture Ratio (IHF) | 2.5dB | ||||
<AM Tuner Section> | |||||
Receiving frequency | 535 kHz to 1605 kHz | ||||
Sensitivity (IHF) | Dummy : 10dB/1MHz (400 Hz, 30% Mod) Loop : 200 μ V/1MHz |
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Image ratio | 80 dB or More (1 MHz) | ||||
IF interference ratio | 70 dB or More (1 MHz) | ||||
Selectivity | 30 dB or more | ||||
AM distortion factor | Not more than 1.0% 0.8% or less (listed in separate catalog) |
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Signal-to-noise ratio | 50 dB or More (400 Hz, 30% Mod) | ||||
Amplifier Unit | |||||
Output |
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Harmonic distortion factor | 0.09% or Less (8 Ω) | ||||
Output Bandwidth (IHF) | 10 Hz ~ 70 kHz (8 Ω) | ||||
Frequency characteristic | 5 hz to 80 khz -3dB 10 Hz ~ 75 kHz -3dB (listed in separate catalog) |
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Input Sensitivity / Impedance | Phono : 3mV/50k Ω 2.5mV/50k Ω (Listed in separate catalog) AUX, Tape Monitor (Din/Pin) : 150mV/100k Ω MIC : 2.2mV/20k Ω 2.5mV/50k Ω (Listed in separate catalog) |
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Signal-to-noise ratio (IHF) | Phono : 80 dB or more Aux : 90 dB or more |
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Phono input resistance | 130mV(1kHz)1% | ||||
Residual noise | 1.0 mV or more | ||||
Channel separation | Phono : 50 dB or more | ||||
Equalizer | RIAA ± 1 dB | ||||
Tone control | Bass : 100 Hz ± 10 dB Treble : 10 kHz ± 10 dB |
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Loudness control (Volume -30dB) |
100Hz:+10dB 10kHz:+6dB |
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Filter | High Cut Filter : -9dB, 10 kHz Low-cut filter : -8dB, 50 Hz |
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<General> | |||||
Semiconductor used | FET : 4 pcs IC : 5 Transistor : 40 Diode : 21 |
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Pwer | 100 VAC ~ 240 V, 50Hz/60Hz | ||||
Power consumption | 200W maximum | ||||
External dimensions | Width 454x Height 155x Depth 330 mm Width 457x Height 168x Depth 368 mm |
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Weight | 13.0kg |