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

Rotel RC-1000 pre amplifier

Rotel RC-1000
A stereo preamplifier/control center featuring a ten-octaave graphic equalizer with center frequencies of 32, 63, 125, 250, 500, 1 k, 2k, 4k, 8k, and 16 kHz. Other features include; a magnetic phono input with selectable loads of 35 k, 50 k and 70 k ohms; a moving coil (MC) phono pickup input; automatic dubbing from/to either of two recorders; and a subsonic filter for the phono input.
There are inputs for magnetic phono, MC phono, tuner, aux, and two tape. One set of stereo line level outputs is provided.
There are controls for volume, balance, ten equalizers, tape monitor/tape dubbing selector, and phono input load selection. Switches for power, octave equalizer on-off, subsonic filter, stereo/mono mode, loudness compensation, 20 dB audio muting, and input selection. Two switched AC outlets are provided.
Performance. The rated output is 1 volt, and all tests were conducted at thic value. With the equalizers in the center,, or Off, position, the frequency response measured ±1 dB from 20 to 20,000 Hz frequency. The output clipping level measured 4,2 volts, with a worse-case distortion of 0,8%.
The equalization range for each equalizer control was nominally ±12 dB at the center frequency. The worse-case distortion with full equalization applied and no more than 1 volt output measured 0,05% T.H.D. the equalizers are relatively broad band and can function either as graphic equalizers or standard tone controls if two or more controls are used to contour the frequency response. Because of their broad characteristic, the equalizers avoid the usual "peaky" midband equalization generally associated with octave equalizers.
The subsonic filter, which is in the phono channel, provides 6 dB attenuation at 10 Hz with absolutely no effect from 20 Hz up. The magneti input hum and noise measured 70 dB, stereo separation was into the noise level.
 Overall dimensions are 16-15/16-inch (wide); 3-27/32-inch (high); 11-13/32-inch (deep). Weight is 10,8 lbs.

Specificationspre Amplifier Section
Output Voltage/Impedance
Rated output :  1 V/1 k Ω
Max. Output (0,1% T.H.D.0 :  3 V/1 k Ω
Total Harmonic Distortion 9rated output, 20 - 20,000 Hz):
Output :  0,03%
Frequency Response:
Output :  5 - 70,000 Hz ±1 dB
Huma nd Noise (IHF A network):
Tuner, Aux :  95 dB
Tape Monitor 1, 2 :  95 dB
Residual :  0,05 mV ( Volume set at min.)
Input Sensitivity/Impedance:
Tuner, Aux :  150 mV/30 k Ω
Tape Monitor 1,2 :  150 mV/30 k Ω
Overload (1 kHz, 0,1% T.H.D.):
Tuner, Aux :  6 V
Tape Monitor 1, 2 :  6 V
Phono Equalizer Section:phono Equalization:  ±0,5 dB (20 to 20,000 Hz)
Huma and Noise (IHF A network):
Phono ! :  75 dB
Phono 2 (MC) :  65 dB
Input Sensitvity/Impedance:
Phono 1 :  2,5 mV/35, 50, 70 k Ω
Phono 2 (MC) :  0,12 mV/30 k Ω
Overload (1 kHz, 0,5% T.H.D.)
Phono 1 :  180 mV
Phono 2 (MC) :  10 mV
Headphones Amplifer Section (Ref. Pre Amplifier Rated Input)
Total Harmonic Distortion (1 kHz) :  0,6%
Frequency Response:  30 - 10,000 Hz +0 dB -3 dB
Huma and Noise (IHF A network):  85 dB
Residual Noise:  35 µV
Output Impedance :  4 - 16 ohms
Crosstalk (at 10 kHz):  40 dB
Control Characteristics:
Octave Equalizer (±12 dB) :  32, 63, 125, 250, 500, 1000, 2000, 4000, 8000, 16000
Loudness Contour:  100 Hz (+10 dB), 10 kHz (+4 dB)
Subsonic Filter:  15 Hz /12 dB/oct
Audio Muting:  -15 dB
Power Requirements:  120 V/60 Hz or 220 V/50 Hz or 240 V/50 Hz or 100, 120, 220, 240 V \; 50/60 Hz
Power Consumption:   16 watt max
Dimensions (W x H x D):  430 x 98 x 290 mm
Weight:  4,9 kg (10,78 lbs)

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