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AKAI AA-940
¥ 99,000 (around 1973?)
Commentary
A stereo receiver designed with plenty of room for high-end circuitry.
The FM front-end part of the tuner uses a dual-gate MOS FET and a frequency-linear four series varicon to improve various characteristics. The IF amplifier stage uses three ceramic filters to improve selectivity and capture ratio.
In addition, the combination of four ICs enables FM reception with low distortion and low noise.
The MPX circuit is equipped with an IC-15 kHz low-pass filter and low-noise silicon transistor to obtain stable stereo effects.
Equipped with FM muting circuit.
The AM tuner section uses a 3-row varicon and ceramic filter.
The frequency characteristics of the preamplifier are improved by using a fully connected circuit using silicon transistors.
The tone control circuit is NF-type and can be adjusted in 2 dB steps.
The power amplifier uses an ITL-OTL-OCL circuit to improve efficiency.
Built-in power supply stabilization circuit and transistor / speaker protection circuit.
Built-in preset volume function.
This function allows you to set the maximum value of the volume in advance by presetting the outer ring of the volume to an appropriate scale.
The meter section uses a two meter system of signal and tuning.
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Model Rating
| Type | FM/AM integrated stereo amplifier |
| FM Tuner Section | |
| Receive Frequency / IF Frequency | 76 MHz ~ 90MHz/10.7 MHz |
| Sensitivity (IHF) | 1.7 μ V |
| Harmonic distortion factor | Mono : not more than 0.2% Stereo : not more than 0.4% |
| Signal-to-noise ratio | 70 dB or more |
| Selectivity | 75 dB or more 80 dB or more (listed in separate catalog) |
| Image ratio | 95 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) | 1.5dB 1.0 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 | 85 dB or More (1 MHz) |
| IF interference ratio | 80 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 (IHF) | 270W (4 Ω) 180W (8 Ω) |
| Continuous rated output | 95W + 95W (4 Ω) 70W + 70W (8 Ω) * Listed in separate catalog 100W + 100W (4 Ω, 0.5% distortion factor) 75W + 75W (8 Ω, 0.5% distortion factor) |
| Harmonic distortion factor | 0.03% or Less (8 Ω, 35W) |
| Output Bandwidth (IHF) | 10 Hz ~ 60 kHz (8 Ω) |
| Frequency characteristic | 5 hz to 80 khz -3dB |
| Input Sensitivity / Impedance | Phono : 3mV/50k Ω AUX, Tape Monitor (Din/Pin) : 150mV/100k Ω MIC : 2.6mV/50k Ω Main amp : 0.5V/150k Ω |
| Phono input resistance | 130mV(1kHz)1% |
| Signal-to-noise ratio (IHF) | Phono : 85B or more Aux : 95 dB or more |
| Residual noise | 1.0 mV or less |
| Channel separation | Phono : 50 dB or more |
| Equalizer | RIAA ± 1 dB |
| Tone control | Bass : 100 Hz ± 10 dB Treble : 10 kHz ± 10 dB |
| Loudness control (Volume -30dB) | 100Hz:+7dB 10kHz:+5dB |
| Filter | High-cut Filter : -10dB, 10 kHz Low-cut filter : -6dB, 50 Hz |
| <General> | |
| Semiconductor used | FET : 4 pcs IC : 5 Transistor : 56 pcs Diode : 36 units |
| Pwer | 100 VAC ~ 240 V, 50Hz/60Hz |
| Power consumption | 360W |
| External dimensions | Width 480x Height 155x Depth 355 mm Width 483x Height 169x Depth 400 mm (listed in separate catalog) |
| Weight | 15.0kg |
