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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





Rotel RA-211


Stereo Pre-Main Amplifier
Her is RA-211, a fully packed amplifier at modest cost. With power capability of 10 W + 10 W RMS continuous power both channels driven at wide frequency response and negligible distortion, this amplifier can outperform other amplifiers of similar costs.
Besides all necessary controls, RA-211 also has connections for two pair of speakers you can use individually or simultaneously, a convenient loudness switch, and tape monitor facility. And Rotel's trdition of excellent quality built into this small but superb machine.

RA-211 Special Featiures
Ample power for true high fidelity sound
All soild state electronic design
All silicon output transistors
Handsomely trimmed aluminum extrusion panel
Simple and easy-to-operate layout of controls
Rotary - Bass, Treble, Balance, Volume and Function Selector
Pushbuttons - Power, Speaker system 1, Speaker System 2, Loudness and Tape Monitor
Convenient headphone jack and power beacon
Facilities for magnetic and ceramic phonos, tuner, tape recorder and auxiliary component
Wood cabinet included

Specifications:
Total Music Power (IHF):  50 W at 4 Ω
Continuous Power (RMS) [all less than 1% T.H.D. at 1 kHz]:
16 W + 16 W each channel driven at 4 Ω
12 W + 12 W each channel driven at 8 Ω
13 W + 13 W both channels driven at 4 Ω
10 W + 10 W both channels driven at 8 Ω
Total Harmonic Distortion:  0,2% (at 9 W + 9 W RMS, 8 Ω)
IM Distortion:  0,6% (at 9 W + 9 W RMS, 8 Ω)
Frequency Response:  20 to 65,000 Hz -3 dB at 8 Ω
Power Bandwidth (IHF):  20 to 35,000 Hz at 8 Ω
Input Sensitivity/Impedance:
Phono Mag 1:  2,7 mV? 45 k Ω
Phono Ceramic 2 :  140 mV/100 k Ω
Tuner, Aux : 170 mV/50 k Ω
Tape Monitor In : 150 mV/50 k Ω
Tape DIN:  330 mV/100 k Ω
Signal-to-Noise Ratio:
Phono :  63 dB
Aux :  70 dB
Tuner, Tape IN :  70 dB
Residual Noise:  1,5 mV
Damping Factor:  35 at 8 Ω
Loudness Control:  +8 dB at 50 Hz ; +3 dB at 10 kHz
Controls:
Bass:  ±10 dB at 50 Hz
Treble :  ±10 dB at 10 kHz
Phono Overload:  80 mV
Phono Equalizer:  RIAA
Crosstalk:  -45 dB
Dimensions (W x H x D):  13" x 4" x 6,5"
Weight:  4 kg (9 lbs)


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