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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





McIntosh MC 502

 When you need high power at very low distortion in a small, compact light weight, reliable power amplifier then you need the MC 502 McIntosh.
The values to look for when looking for a power amplifier are:
Quality construction.
Reliability.
Design excellence.
Mechanical strength
Electrical versatility
Convenience of operation
Stability and superipr performance.
 The McIntosh MC 502 power amplifier is probably the most compact source of very low distortion stereophonic power in existence. It is truly unique. More than any other amplifier it provides very low distortion stereo power, more sophisticated yet practical protection, and more bandwidth in a amazingly small yet eliable package. For example; the MC 502 weighs only 27 pounds yet it can deliver 75 watts per channel into 2,7 to 4 ohms loudspeakers, sine wave, continuous average power at less than 0,02% distortion, harmonic or intermodulation from 20 Hz to 20 kHz.
 There are three protection circuits which contribute to the reliability, long life, and excellent performance of the MC 502. the first control circuit is the Sentry Monitor which senses and confines current and voltage conditions to the safe operating characteristics of the output stage power transistors. Power Guard is the second control circuit, and eliminates amplifier output clipping. Amplifiers are capable of delivering large quantities of power when they are driven to clipping. Clipping is caused when the amplifier is asked to produce more power output than it can deliver with low distortion. A clipped amplifier can have more than 40% harmonic distortion. The extra energy content of the clipped signal will damage most loudspeakers. This new McIntosh advancement helps protect your speakers from this kind of damage. Power Guard does not limit the dynamic range or the power output of the power amplifier. The third control circuit is the speaker protection and turn on delay arrangement.
  The Sentry Monitor, Power Guard, and speaker protector circuits were developed by McIntosh engineers and are each covered by U.S. patents assigned to McIntosh Laboratory.
The cubical content of the amplifier chassis is less than 513 cubic inches and yet at full continuous sine wave output the entire structure is cool, a really effective example of thermal engineering. It is this kind of thermal transfer designing that makes possible the fabulous reliability of McIntosh engineering talent and achievement.
 Of all the good equipment manufactured today, only McIntosh amplifiers offer lowest distortion, high reserve power, long life, trouble free performance and highest value. For more than 20 years mcIntosh has been recognized as the leader. Continuous mahor investment in engineering and development provides you with conservative use of the newest and best in solid state physic and space age technology.
Specifications MC 502
Power Output (minimum sine wave continuous average power output per channel from 20 to 20,000 Hz, both channels operating)
Stereo:  75 watts into 2,7 to 4 Ω ;  50 watts into 8 Ω
Which is :
14,2 volts RMS across 2,7 Ω
17,3 volts RMS cross 4 Ω
20,0 volts RMS across 8 Ω
Mono (Bridged):  150 watts into an 8 Ω
Which is : 34,6 volts RMS across 8 Ω
Output Load Impedance
Stereo :  2,7 Ω to 8 Ω
Mono:  8 Ω 9obtained by connecting across the output terminals of both channels)
Total Harmonic Distortion
Stereo :  0,02% ( max. at any power level from 250 milliwatts to rated power per channel from 20 - 20,000 Hz, both channel operating)
Mono :  0,02% (  max. at any power level from 250 milliwatts to rated power per channel from 20 - 20,000 Hz)
Intermodulation Distortion
Stereo :  0,02% (max. at any power level from 250 milliwatts to rated power per channel both channels operating for any combination of frequencies, 20 - 20,000 Hz)
Mono :  0,02% (max. at any power level from 250 milliwatts to rated power for any combination of frequencies, 20 - 20,000 Hz)
Frequency Response: 
20 Hz - 20,000 Hz  +0, -0,25 dB at rated power
10 Hz - 100,000 Hz +0, -3 dB at rated power
Hum and Noise:  95 dB below rated output
Ratings Output Voltages:  25 volts for distribution lines
Damping Factor:  Greater than 50
Input Impedance:  75,000 Ω
Input Sensitivity/Impedance
Switchable:  0,75 volt or 2,5 volt/ level control provided for higher input voltges
Power Requirement:  120 Volts, 50/60 Hz ; 0,2 to 4 amperas 920 to400 watts)
Dimensions :
Front Panel (W x H) :  406 x 92 mm (16" x 3-5/8")
Chassis (W x H x D):  375 x 60 x 368 mm (14-3/4" x 2-3/8" x 14-1/2") 
Finish:  Front panel is anodized gold and black with special gold/teal nomenclature illumination. Chassis is black.

Weight:  12,2 kg (27 pounds) net
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