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-1003

PRA-1003 Control Amplifier was introduced as a control amplifier for the new era, bringing into full play the operation factors of a tape deck which has come to assume an important position as the program source. By introducing new circuitry, it incorporates a high Signal-to-Noise  ratio equalizer amplifier, low distortion, and ultra wide range flat amplifier.

Input capacitorless (ICL)
Low noise FET parallel differential amplifier circuitry in the first stage, current mirror differential predrive pure complementary PP output with emitter follower, 14 transistors on one channel, high Signal-to-Noise 86 dB, and equalizer amplifier
Phono 2 is provided with an impedance change-over switch which will bring out the full performance of the cartridge. Input terminals are all gold plated
Simultaneous recording of 3 tape decks, 1 (2/(3 tape copy possible. Rec Function to meet the are of real recording

Type:  ALL silicon transistor stereo control amplifier
Input Sensitvity/Impedance: 
Phono 1 :  2,5 mV/50 k Ω
Phono 2 :  2,5 mV/30, 50, 100 k Ω
Max. Allowable Input:  320 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% (20 Hz - 20 kHz, 3 V)
Frequency Response:  10 - 100 kHz +0 dB, _1 dB
Signal-to-Noise Ratio:  better than 86 dB (IHFA network)
Gain Control:  0, -10, -20 dB (0 dB =16,5 dB)
Low :  20 Hz (18 dB/oct)
High : 9 kHz (6 dB/oct)
Crosstalk:  -100 dB (20 Hz - 1khz); -80 dB (20 kHz) - (Phono In - output, defeat)
Power Supply:  AC 120 / 220 - 240 V, 50/60 Hz
Power Consumption:  10 W
Dimensions (W x H x D):  410 x 170 x 270 mm
Weight:  7 kg

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