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 RX-203A

 AM/FM Stereo Receiver RX-203A Features:
Darlingto direct-coupled OCL complementary power amplifier
Plus-minus split power supply
Direct coupled NF phono equalizer and tone control amplifier
FM IF section with IC ceramic filters
All necessary functions and connection facilities
Extra wide linear FM dial scale Signal strength tuning meter
LED stereo indicator
Facility for 2 pairs of speaker systems
Specifications:
Power Amp Section
Continuous Power Output: 
20 watts per channel min. RMS both channels driven into 8 Ω (from 20-20,000 Hz with no more than 0,5% THD)
24 watts per channel min. RMS both channels driven into 4 Ω (from 20-20,000 Hz with no more than 0,5% THD)
Total Harmonic Distortion (20 - 20,000 Hz) : 
no more han 0,5% (continuous rated power output),
no more than 0,1% 91 watt per channel power output, 8 Ω )
Intermodulation Distortion (50 Hz : 7,000 Hz = 4 : ):
no more han 0,51% (continuous rated power output),
no more than 0,1% 91 watt per channel power output, 8 Ω )
Damping Factor:  40 (20-20,000 Hz , 8 Ω) ±10%
Output:
Speaker :  4 ~ 16 Ω (A, B); 8 ~ 16 Ω (A+B)
Headphone :  4 ~ 16 Ω
Pre Amp Section
Input Sensitivity/Impedance: 
Phono [Mag] :  2,5 mV/45 k Ω, (200 pF)
Phono [Ceramic] :  120 mV/240 k Ω
Aux, Tape In :  150 mV/35 k Ω
Aux, Tape In :  150 mV/33 k Ω
Overload Level (max. Input level, THD 0,5%, 1 kHz):
Phono :  120 mV
Aux  :  not less than 5 V
Output Level/Impedance (5 mV Phono Input):
Tape Out :  300 mV/260 Ω
Tape Out DIN :  100 mV /90 k Ω
Frequency Response: 
Phono :  30 - 15,00z Hz ±1,0 dB (RIAA Equalization)
Aux, Tape In :  5 - 70,000 Hz,  +0 -3 dB
Tone Control:
Bass : ±10 dB at 100 Hz
Treble :  ±10 dB at 10 kHz
Loudness Contour:  +7 dB at 100 Hz ; +4 dB at 10 kHz 
Hum and Noise (IHF, short circuited A network, rated power): 
Phono [Mag]:  75 dB
Aux, Tape In :  85 dB
FM Tuner Section
Usable Sensitivity:
Mono :  11,2 dBf (2,0 µV /300 Ω antenna)
Stereo :  39,0  dBf (48 µV/300 Ω antenna)
Usable Sensitivity (IHF '58):  2,0 µV
50 dB Quieting Sensitivity:
Mono :  16,0 dBf (3,5 µV/300 Ω antenna)
Stereo : 39,0 dBf (48 µV/300 Ω antenna)
Signal-to-Noise Ratio (at 65 dBf): 
Mono :  75 dB
Stereo :  65 db
Distortion (at 65 dBf): 
At 100 Hz [mono/stsreo]:  0,2%/0,3%
At 1 kHz [mono/stereo]:  0,2%/0,3%
At 6 kHz [mono/stereo]:  0,3%/0,4%
Frequency Response:  30 Hz to 15,000 Hz +0,2 dB -1,0 dB
Capture Ratio:  4,0 dB
Alternate Channel Selectivity:  50 dB
Spurious Response Ratio:  75 dB
Image Response Ratio:  50 dB
IF Response Ratio:  75 db
AM Suppression Ratio:  50 db
Stereo Separation:  40 dB (at 1 kHz)
Subcarrier Product Ratio:  45 dB
SCA Rejection Ratio:  60 dB
Antenna Input:  300 Ω (balanced; 75 Ω (unbalanced)
AM Section
Sensitivity: 
250 µV/m (IHF, ferrite antenna)
12,5 µV *IHF, ext. antenna)
Selectivity:  25 dB
Signal-to-Noise Ratio:  50 dB
Image Response Ratio:  45 dB
IF Response Ratio:  50 dB
Antenna:  Built-in ferrite loopstick antenna (inside the chassis)
Miscellaneous:
Power Supply:  110-120 V, 220-130 V AC, 50/60 Hz
Power Consumption:  16 watts
Dimensions (W x H x D):  410 x 130 x 280 mm (16-6/32" x 6-1/16" x 11")

Weight:  7,0 kg (15,4 lbs)

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