User manual MCINTOSH MC2205 BROCHURE

[. . . ] Although we may listen to surprisingly low average power output, the peak power requirements can be very high. Consider these graphs of the power demanded of an amplifier reproducing the pipe organ, the piano, and the bass saxophone. The charts show that the peak power demands is almost 30 dB or 1000 times the average power demand. [. . . ] In addition, as direct reading watt meters they are calibrated in average watts for a sine wave signal but respond to signal peaks. mizes heating. Additionally, when there is no signal output no output transistor is conducting. " When there is no signal no output device is conducting. Conservative Mclntosh engineering keeps operating temperatures low assuring long life. 12 10 8 6 Output current in amps 4 2 0 -2 Ordinary meters are incapable of indicating the short interval information in a sound wave. The mass of the meter movement is too great to respond to the nearly instantaneous changes in music program material. That short interval information can have a duration as short as one-half of one thousandth of a second. Should the meter be capable of the high velocity movement the human eye could not perceive the information. Mclntosh engineering pursued both problems electrically. By developing new electronic circuits the meters are made to respond to short intervals with an accuracy of 98%!To permit the eye to see such high speed motion the electronic circuits that drive the meter pointer are time stretched so the meter pointer position can register in the persistence of vision characteristics of the human eye. To achieve long trouble free life in an amplifier it is essential to have cool operation. Cool operation is the result of careful design of the output circuit. Correct matching of the output circuit to the loudspeakers with an autotransformer and a mechanical layout that uses generous sized, adequately ventilated heat sinks complete the design for cool operation. The use of bipolar expitaxial output transistors in the Mclntosh output circuit allows the amplifier to operate as cool as possible. The predriver, driver, and output stages are fully complementary and have high circuit efficiency which mini- -4 -6 -8 -10 -12 -100 -90 -80 -70 -60 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 Output volts Load and limiting characteristics at 8 ohm output of MC 2205 The interleaved multifiler wound Mclntosh designed autotransformer transfers all the power you paid for to all impedance taps. [. . . ] No other manufacturer offers you this money back guarantee of performance. The famous Mclntosh 3 Year Service Contract protects you from any cost of repair for three full years because Mclntosh will provide all parts, materials and labor needed to return the measured performance to the original performance limits free of any charge. The SERVICE CONTRACT does not cover any shipping costs to and from the authorized service agency or the factory. MC 2205 PERFORMANCE LIMITS PERFORMANCE GUARANTEE Performance Limits are the maximum deviation from perfection permitted for a Mclntosh instrument. [. . . ]