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-810

The RA-810 is propably one of the most versatile, most professional stereo pre-main amplifiers ever developed.  Possessing an abundant 180 watts music power, the specially designed split power supply drivers almost any quality speakers stably and smoothly. The direct coupling circuitry incorporated ensures an excellent frequency response and negligible IM distortion. The transistors used are all long-life, low-noise silicon types that give the RA-810 its superb S/N and extended dynamic range. Note that a wide 5 to 50,000 Hz power bandwidth and THD of 0,3% or less are also achieved by this highly advanced equipment. Naturally the controls and the connection facilities are just as awesome. Most of all, see the RA-810 in actual, and find out its personality yourself.
Special Features
All long-life, low-noise Silicon Transistors.
Direct Coupling Circuity.
Split Power Supply.
Specially designed protection circuits to prevent damages to your speakers and to the amplifier.
Separable Pre-Amp and Main-Amp sections for many versatile uses.
3-stages Direct Coupled pre-amplifier.
Usage of 2 pairs of speaker systems, one pair at a time or simultaneously at the same time.
Facility for two tape recorders, with monitoring and dubbing features.
Facility for two record players, with switcheable input sensitivities and impedances for one of them to match characteristics of your cartridge.
Facilities for a stereo tuner, two auxiliary inputs for such as another tape recorder and 8-track tape player.
Facility for two Tape DIN Jacks.
Facility for 3 AC Outlets.
Long-stroke Slide Tone Controls, convenient for precise and effective tone adjustments.
Volume Control, Selector Control, Mode Control, Monitor control, Speaker Selection Control and Balance Slide Control.
"Push-Push" type switches for Muting, Loudness, High and Low Filters, Tone and Power.
A Power Indicator Lamp for easy visual indication.
A front panel Headphone Jack.
Power Amplifier Section
Total Music Power (IHF): 
180 watts at 4 Ω;
125 watts at 8 Ω
Continuous Power (RMS, both channel driven, THD less than 0,5%):
60 watts/channel at 4 Ω;
40 watts/channel at 8 Ω
Harmonic Distortion:  less than 0,3%  (20 -20,000 Hz at 40 W/ch)
Intermodulation Distortion:  0,1% at 40 W/ch
Frequency Response:  4 to 75,000 Hz; +0 -3 dB
Power Bandwidth (IHF):  5 to 50,000 Hz at 8 Ω
Input Sensitivity/Impedance:  1 V/30 k Ω
Damping Factor:  35 at 8 Ω
Speaker Impedance:  4 to 16 Ω
Pre-Amplifier Section
Output Voltage:  1 V (rated), 3 V (maximum)
Harmonic Distortion:  less than 0,1% at rated output voltage
Frequency Response:  3 to 50,000 Hz,  +0 -3 dB
Hum and Noise:
Phono 1 and 2 :  65 dB
Tuner, Tape In : 75 dB
Aux 1 and 2 : 75 dB
Residual Noise:  1,5 mV
Input Sensitivity/Impedance:
Phono 1 : 2 mV/ 100 k Ω
Phono 2 : 2, 4, 8 mV/30 k, 50 k, 100 k Ω
Tuner, Tape In : 200 mV/45 Ω
Aux 1 and 2 : 200 mV/45 Ω
Tape DIN : 330 mV/100 k Ω
Phono Equalizer:  EEF type, RIAA ±0,5 dB, 50 to 15,000 Hz
Phono Overload:  125 mV
Loudness Switch:  +10 dB at 50 Hz;  +6 dB at 10,000 Hz
High Filter:  -10 dB at 10 kHz
Low Filter:  -10 dB at 50 Hz
Muting Switch:  -20 dB at 1 kHz
Bass Control:  ±10 dB at 50 Hz
Treble Control:  ±10 dB at 10,000 Hz
Crosstalk:  43 dB at 1khz
Square Wave Risetime:  5 microseconds
Power Requirements:  100, 117, 220, 240 V 50/60 Hz
Power Consumption:  150 watts max.
Dimensions (W x H x D):  420 x 140 x 304 mm  (16½" x 5½" x 12")
Weight:  10 kg (22 lbs)

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