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

Denon PRA-1001

 Solid State Stereo Control Amplifier PRA-1001 (1978)
Pursuing the fundamentals of control amplifiers, this product is a result of looking into their functions, performance, design and other related problems. All the functions are incorporated.
A 7 transistor equalizer amplifier with 2-stage differential amplifier, current mirror circuit, last stage Class A pure complementary push-pull coupling.
Low distortion tone control circuitry of the NF type by means of passing through a complementary push-pull buffer with differential and inverted amplifier circuits.
Unique low distortion filter circuit capable of changing the cut-off frequency by change over to an independent filter amplifier
Distinct localization of the sound image with separation characteristics of 80 dB (20 Hz - 20 kHz)

Type:  all silicon transistor stereo control amplifier
Input Sensitivity/Impedance:
Phono 1 :  3,2 mV/50 k Ω
Phono 2 :  3,2 mV/30, 50, 100 k Ω
Max. Allowable Input:  300 mV (1 kHz)
RIAA Deviation:  ±0,2 dB (20 Hz - 20 kHz)
Max. Output/Rated Output:  10 V/1 V
Total Harmonic Distortion:  0,003%
Frequency Response:  10 Hz - 100 kHz (+0,1  -0,5 dB)
Signal-to-Noise Ratio (IHF A network):  better than 78 dB
Gain Control:  0, -10, -20 dB
Filter:  10 Hz ; 40 Hz (18 dB/oct)  7  kHz ; 14 kHz (18 dB/oct)
Crosstalk:  -80 dB (20 Hz - 1khz - 20 kHz)[Phono In - output defeat]
Power :
Supply:  AC 120 V 60 Hz; 220/240 V 50/60 Hz
Consumption:  18 W
Dimensions (W x H x D):  410 x 152 x 271 mm
Weight:  8 kg

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