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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-910 receiver

Solid State FM/AM MPX Stereo Tuner Amplifier
Stereo Tuner Amplifier AA-910
The AA-910 receiver is the first release of Akai's new AA-900 Series. Smart and sleek, but robust styling gives this model a "dignified" look. Ideally positioned front panel controls for complete operating ease and efficiency. Space-age circuits for quality stereo sound  at 50 W music power.
Specifications
Amplifier Section
Output : 2 x 12 W at 8 Ω (distortion 1%)
Frequency Response:
Phono :  RIAA ±1,5 dB
Aux :  20 Hz - 50 kHz +1 -2 dB 
Input Sensitivity: 
Phono :  2m2 mV (-51 ±1,5 dB)
Aux :  110 mV (-17 ±1,5 dB)
Tape :  110 mV (-17 ±1,5 dB)
Signal-to-Noise Ratio: 
Phono :  better than -37 dBm
Aux :  better than -47 dBm
Tape :  better than -47 dBm
Residual Noise:  1,1 vm (less than -57 dBm)
Tone control
Bass :  ±9,5 dB at 100 Hz ±1,5
Treble :  ±10 dB at 10 kHz ±1,5
Loudness Control:  9 dB at 100 Hz ±1,5 ; 4 dB at 10 kHz  ±1,5
Cross Talk:  better than 50 dB  (Phono 1 kHz)
L-R Deviation:  within 3 dB Phono
Recording Output
110 mV (-17 ±2dB)  PIN
22 mV (-31 ±2 dB) DIN
FM Tuner Section
Frequency Raange:  75 to 91 MHz ±1 (J);  86 to 109 MHz ±1 (U)
Dial Tracking Error:  ±250 kHz
Sensitivity (IHF):  2 µV  (3,2 µV)
Sensitivity Deviation:  within 3 dB
Image Rejection Ratio:  65 dB ("J" better than 40 dB ; "U" better than 45 dB)
IF Rejection Ratio:  90 dB ("J" better than 85 dB ; "U" better than 80 dB)
Capture Ratio (IHF):  2,5 dB (less than 2 dB)
Limiting Sensitivity:  less than 10 dB
Selectivity:  65 dB (better than60 dB)
AM Suppression Ratio:  better than 45 dB
Signal-to-Noise Ratio:  70 dB
Stereo :  better than 45 dB
Monarual :  better than 60 dB
Distortion Factor
Stereo :  0,8% (less than 2%)
Monarual :  0,4% (less than 0,5%)
Frequency Response:  -13 ±1 dB at 10 kHz (J);  -11 ±1 dB at 10 kHz (U)
Stereo Sensitivity:  45 µV (33 ±3 dB)
Stereo Separation:  40 dB (better than 33 dB)
Rejection ratio:  better than 45 dB
L-R Deviation:  within 3 dB
Recording output:
150 mV (-14  ±2 dB) PIN
24 mV (-30 ±2 dB) DIN
AM Tuner Section
Frequency Range:  525 kHz to 1650 kHz
Dial Tracking Error:  within 2%
Sensitivty (IHF):  450 µV
Sensitivty Deviation:  within 6 dB
Image Rejection Ratio:  55 dB (better than 50 ad at 1 MHz)
IF Rejection Ratio:  better than 45 dB at 1 MHz
Selectivity:  better than 30 dB ±10 kHz
Signal-to-Noise ratio:  50 dB (better than 40 dB)
Distortion Factor:  1% (less than1,5%)
Frequency Response:  -15 dB at 3 kHz
Recording Output: 
150 mV (-14 ±2 dB) PIN
24 mV (-30 ±2 dB)  DIN
General Section
Semiconductors:  29 Transistors, 2 IC's; 12 Diodes; 2 Zener Diodes;2 Varistors; 2 Thermisters
Power Source:  100 to 240 V 50/60 Hz
Power Consumption:  100 W
Dimensions (W x H x D):  457 x 168 x 368 mm (18" x 6,6" x 14,5")
Weight:  10,5 kg (23,1 lbs)