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

Audio Research Classic 30

Audio Research now proudly introduces the Classic 30; new , moderately priced stereo hybrid amplifiers that come surprisingly close to the benchmark set by the acclaimed Classic 150 hybrid monaural amplifier.
It doesen't take a "golden ear" to immediately perceive the emotinal power and sonic authority the Classic 30 bring to any good musical program. Silences are more silent by an order of magnitude; the soundstage is broad, deep tall; instrumental timbres have an uncommon truth to them; dynamics soft and loud are unbelievably convincing.
And the Classic 60-30 are designed to provide years of trouble-free service. You don't need to be a technican to use and enjoy them.
Quite simply, the Classic 30 bring world-class audio performance within reach of most music lovers. Audition one today at your nearest Audio Research dealer.
Putting the state-of-the art. Within everyone's reach… the Classic 30
It's tempting to regard the Classic 30 as merely the smaller sibling of the Classic 60 and Classic 150.
But the skeptical music lover or audiophile who auditions the Classic 30 is in for quite a shock. Because this "little" hybrid stereo amplifier - rated at 30 WPC - packs a sonic authority and eloquent musical veracity that larger, more conventional power amplifiers might envy. Our engineer have discovered that sometimes less is very definitely more.
Of course, the Classic  30 features almost all the same technology as its bigger brothers, scaled down for more modest applications. It has four 6550s instead of eight, two 6FQ7 driver tubes instead of four; no fans, because it runs remarkably cool without any help whatever.
But this smaller design still retains a similar degree of exceptional musical resolution. Even at low gain settings, the Classic 30 is far more musically lucid than amplifiers objectively far more powerful.
The Classic 30 is at its pristine best with moderately efficient loudspeakers in smallto medium sized listening rooms; with program materials that demand high resolution and subtlety rather than pure muscle. In that context, it reveals the same sonic mastery as its more powerful siblings.
But don't take our word for it. Audition a Classic 30 today and discover just how much more music can come alieve , with" less"
Power Output:  30 watts (minimum continuous at 16 Ω from 17 Hz - 20 kHz with less than 1,0% T.H.D.)Power  Bandwidth:  15 Hz to 50 kHz (-3 dB Points)
Input Sensitivity:  ,4 V RMS for rated output
Input Impedance:  100 k Ω nominal
Output Regulation:  approx.0,4 dB (16 Ω load to open circuit , damping factor approx. 23)
Negative Feedback:  19 dB
Slew Rate:  15 volts/microsecond
Rise Time:  3,5 microsecond
Hum and Noise:  less than 0,5 mV RMS, 93 dB below rated output (20 kHz bandwidth unweighted, inputs shorted)
Power Supply Energy Storage:  approx. 150 joules
Power Requirements:  105 -125 V AC 60 Hz (210-250 V AC 50 Hz)
Power Consumption:  300 watts at rated output; 400 watts maximum, 200 watts at "idle"
Tubes Required: 
for Power Output :  2 x matched pair 6550 (low gas);
for Drivers :  2 x 6FQ7/6CG7
Dimensions (W x H x D):  approx. 480 x 180 x 370 mm (19" x 7" x 14,5")
Handles extend :  41 mm (1-5/8") forward of the front panel
Net :  20,9 kg (46 lbs)
Shipping :  28,2 kg (62 lbs)

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