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What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.



H.H. Scott '59





Akai AA-1040 receiver

 

Stereo Receiver Akai model AA-1040

Features:

Akai's engineers succeeded in designing the best cost performance receivers on the market with the AA-1000 series. The newest release of Akai's series, model AA-1040 features in Continuous Power Output, 40 watts per channel (both channel activated from 20 to 20,000 Hz with no more than 0,15% T.H.D. at 8 ohms load impedance)

Phase Locked Loop (P.L.L.) IC for FM MPX circuit together with Automatic Frequency Control {AFC) for perfect and stable FM reseption

Variable FM Muting Control for convenient FM tuning

 


Specifications

Amplifier Section

Continuous Power Output:  40 watts per channel , min. RMS, at 8 ohms from 20 Hz to 20 kHz, with no more than 0,15% T.H.D.

Power Bandwidth (IHF) :  7 Hz to 70,000 Hz / 8 Ω  (Distortion within 0,15%)

Input Sensitivity/Impedance

Phono 1, 2 :  3 mV/47 k Ω

Tape 1, 2 :  150 mV/100 k Ω

Aux :  150 mV/100 k Ω

Signal-to-Noise Ratio (IHF)

Phono :  better than 80 dB

Aux :  better than 90 dB

Channel Separation (IHF):

Phono :  better than 60 dB (at 1 kHz)

Equalizer Phono :  RIAA ±1 dB

Tone Controls

Bass :  ±10 dB at 100 Hz

Trebble :  ±10 dB at 10 kHz

Loudness Contour: +10 dB at 100 Hz; +6 dB at 10 kHz (Volume control set at -30 dB position)

Filter:

High :  -10 dB at 10 kHz

Low :  -8 dB at 50 Hz

FM Tuner Section

Frequency Range:  88 MHz - 108 MHz

Sensitivity (IHF):  1,9 µV

Capture Ratio (IHF):  1,0 dB

Selectivity (IHF):  better than 80 dB at 98 MHz

Signal-to-Noise Ratio :  better than 75 dB

Image Rejection:  better than 90 dB at 98 MHz

IF Rejection:  better than 100 dB at 98 MHz

Spurious Rejection:  better than 90 dB at 98 MHz

Harmonic Distortion

Mono :  less than 0,15%

Stereo :  less than 0,3%

FM Stereo Separation:  better than 40 dB ( at 1 kHz)

FM Muting:  Variable (3 µV to 300 µV) On-Off

Antenna Input:  300 Ω  (balanced), 75 Ω  (unbalanced)

AM Tuner Section

Frequency Range:  535 kHz to 1605 kHz

Sensitivity (IHF):  180 µV/m (Bar antenna); 8 µV (ext. Antenna)

Image Rejection:  better than 55 dB at 1 kHz

IF Rejection:  beter than 45 dB at 1 kHz

Selectivity (IHF):  better than 45 dB at 1 kHz

AM Distortion:  less than 0,6%

Signal-to-Noise Ratio:  better than 50 dB

General Section

Semiconductors:  1 FET, 49 Transitors; 22 Diodes; 3 ICs

Power Requirements:  120 V, 220 V, 240 V 50/60 Hz

Dimensions (W x H x D):  480 x 155 x 390 mm (18,9" x 6,1" x 15,4")

Weight:  12,8 kg (28,2 lbs)

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