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

Pioneer A-40 amplifier

Non -Switching Stereo Amplifier
Continuous average power output of 70 watts per channel, min. at 8 ohms, from 20 Hz to 20 kHz with no more than 0,009% Total Harmonic Distortion
Non-Switching Power Amplifier
Eliminates switching distortion and drastically reduces all other types of distortion while reatining high efficiency.
Low-noise phono equalizer
Features an FET input to assure wider dynamic range and lower distotion from any record.
LED indicators
Include 7-segment power indicator for each channel and indicators for each input
Other features include:  Tape dubbing, A/B speaker drive, Loudnes contour control.

Continuous Power Output:
Continuous average power output of 70 watts per channel, 
(min. at 8 Ω, from 20 Hz to 20 kHz with no more than 0,009% T.H.D.)
Total Harmonic Distortion (20-20,000 Hz, 8 Ω):  0,009% (continuous rated power output)
Intermodulation Distortion (50 Hz :7,000 Hz =4;1; 8 Ω, from Aux):
Damping Factor (20 - 20,000 Hz, 8 Ω):  50
Input Sensitivity/Impedance:
Phono MM :  2,5 mV/50 k Ω
Tuner, Aux, Tape :  150 mV/50 k Ω
Phono Overload Level (1 kHz):  150 mV
Output level/Impedance:
Tape REC :  150 mV
Speaker :  A, B, A+B, OFF
Headphones :  Low Impedance
Frequency Response:
Phono (RIAA Equalization) :  20 - 20,000 Hz ±0,2 dB
Tuner, Aux, Tape Play :  10 - 70,000 Hz 0 dB -3 dB
Tone Controls
Bass :  ±10 dB at 100 Hz
Treble :  ±10 dB at 10 kHz
Loudness Contour (volume at -40 dB position):  +6 dB (100 Hz ), +3 dB (10 kHz)
Hum and Noise (IHF, A-network)
Phono Music :  86 dB
Tuner, Aux, Tape Play :  102 dB
Power Requirement:  120 V 60 Hz
Power Consumption:  190 W
Dimensions (W x H x D):  420 x 98 x 287 mm (16-9/16" x 3-7/8 " x 11-5/16")
Weight (net):  6,5 kg (14 lbs 5 oz)

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