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 60

 Audio Research now proudly introduces the Classic,  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 60 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 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 60 bring world-class audio performance within reach of most music lovers. Audition one today at your nearest Audio Research dealer.
For effortless musicality and value second to none,  it has to be the Classis 60.
The Classic 60 Hybrid Stereo Power Amplifier resembles the long-popular D115 in Audio Research's family of High Definition power amplifiers. But its lineage is strictly Classic 150. which means nothing less than state-of-the-art. In design, construction, musicality and operational convenience, at an affordable price.
Like the Classic 150, the Classic 60 proceeds from the notion that power ratings don't always describe a power amplifier's real capabilities. Far more important are such qualities as dynamic stability, lucidity, subtlety. And to achieve those, audio Research has used its traditional partial cathode coupling along with triode operation of the Classic 60's eight 6550 power output tubes. Additional circuit improvements as well as the usual rigorous parts selection and manufacturing Audio Research is noted for also contribute sonically.
 Translated into the language of listening, this signifies stunning bandwidth, a noise floor virtually beneath audibility and musically fulfilling SPLs at dramatically lower gain settings. Dynamics, timbers of individual instruments, soundstage and musical emotion all surge out rom a black velvet of silence.

Simply put, the Classic60 resolves far more of a musical program than amplifiers rated at two, three or four times its seemingly modest 60 WPC.
But the Classic 60 is easily up to the task of driving all but the most demanding loudspeakers, even in spacious listening rooms. And while it shows modest preamplifiers in their best light,it also shines when coupled with premiere designs, such as Audio Research's Sp14 or Sp15.
 Convenience figures high on the Classic 60's list of attributes, as well. For example, DC balance of the output tubes is maintained automatically, while tube biasing continuously adjust to changes in incoming line voltage. Performance stays razor-sharp without bother some tweaking or adjustments. And quiet fan cooling, along with triode operation, means significantly longer tube life. A Classic 60 owner can look forward to years of low-maintenance performance.
Specifications
Power Output:  60 watts (minimum continuous at 16 Ω from 15 Hz - 20 kHz with less than 1,0% T.H.D.)Power  Bandwidth:  12 Hz to 40 kHz (-3 dB Points)
Input Sensitivity:  0,55 V RMS for rated output
Input Impedance:  100 k Ω nominal
Output Regulation:  approx.0,3 dB (16 Ω load to open circuit , damping factor approx. 30)
Negative Feedback:  20 dB
Slew Rate:  20 volts/microsecond
Rise Time:  2,0 microsecond
Hum and Noise:  less than 2,0 mV RMS, 84 dB below rated output (20 kHz bandwidth unweighted, inputs shorted)
Power Supply Energy Storage:  approx. 280 joules
Power Requirements:  105 -125 V AC 60 Hz (210-250 V AC 50 Hz)
Power Consumption:  500 watts at rated output; 700 watts maximum, 370 watts at "idle"
Tubes Required: 
for Power Output :  4 x matched pair 6550 (low gas);
for Drivers :  4 x 6FQ7/6CG7
Dimensions (W x H x D):  approx. 480 x 180 x 400 mm (19" x 7" x 15,75")
Handles extend :  41 mm (1-5/8") forward of the front panel
Weight:
Net :  28,6 kg (63 lbs)
Shipping :  34,5 kg (76 lbs)

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