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-30

McIntosh, the world's most advanced amplifier is unequalled for quality reproduction of any sound source. Its unique circuitry provides ample reserve power combined with unprecedented low distortion - less than 0,5% harmonic distortion at all frequencies, 20-20,000 Hz (cycles) and at any volume, even full power. Designed for those who expect the finest, the McIntosh MC-30 sets a new standard among amplifiers today. It Brings an almost unbelievable clarity of tone - clean, pure living sound. Most important, you can listen to the McIntosh for hours without listening fatigue or irritation. For performance that really makes a difference, enjoy the McIntosh, masterfully crafted for your lifetime satisfaction.

The 30 watt Amplifier model MC-30
Featuring the patented McIntosh Circuit
Guaranteed 0,5% maximum intermodulation distortion
Unity Coupling for performance plus
Beautifully Styled in Black and Chrome
Zero VU Line Level or any Tuner will drive to full output

Why the exclusive patented McIntosh circuit brings you purest high-fidelity sound....
The McIntosh circuit is fundamentally new. It provides practically 100% coupling between primary windings of the output transformer, by winding the primary wires together, or bifilarly. the high efficiency of class "B" amplification can be used for the first time with high quality performance. Wave form distortion, causing listening irritation, due to switching transients between each half of the class "B" amplifier is eliminated at all frequencies.
Before 1947, truly faithful amplified sound was severely limited by: (1) too much distortion;and 82) not enough power capacity. With the invention of the McIntosh circuit, less than 1% distortion became the performance standard which engineers everywhere had been striving to attain. The McIntosh has an inherent large advantage over conventional circuits. By bringing the output tubes electrically four times closer together the impedance is 1/4 that of the conventional circuits. The coupling to the secondary is improved by a similar factor of 4 to 1 since the primary to secondary turns ratio has been reduced 2 to 1. The 1/2 cathode, 1/2 plate loading provides a feedback factor of 12 dB, which with additional loop feedback, offers the lowest distortion, most stable power amplifier made.


Specifications
Power Supply: 117 - 125 volts, 50/60 cycles
Power Consumption: 135 watts at 30 watts output; 105 watts at zero signal output
Power Output: 30 watts continuous
Input Level:
Input-1 (pin jack and screw terminals and pin 5 of pre-amp socket) .5 volts to 30 volts, with gain control
Input-2 (pin 2 of pre-amp socket) 2,5 volts, (for use with McIntosh pre-amplifier equipment)

Frequency Range:
20 to 30,000 cycles ±.1 dB at 30 watts output
15 to 50,00 cycles ±.5 dB at 30 watts output
10 to 1000,000 cycles ±1 dB at 15 watts output
Harmonic Distortion: less than ⅓% if instantaneous peak power is below 60 watts for any
combination of frequencies 20 to 20,000 cycles
Impulse Distortion: negligible
Noise and Hum Level: 90 dB or more below rated output
Damping Factor: 12 or better for 4, 8 and 16 Ώ output, 16 for 600 Ώ
Input Impedance: 0,5 meg for 0,5 volt input and 0,13 meg for 2,5 volt input. 20 cycles to 40 kc
Output Impedance: 4, 8, 16 and 600 Ώ (600Ώ is balanced to ground)
Phase Shift: 20 cycles 3°, 20,000 cycles 9°
Tube Complement: Pre-Amp: 12AX7
Phase Inverter: 12A U7
Voltage Amp. 12BH7
Driver: 12AX7
Output: 2 - 1614
Rectifier: 5U4-GA
Auxiliary Equipment connection (“Pre-Amp Input” receptacle): Designed to power C-8 and other
McIntosh Pre-Amplifiers
Size: 13” x 8” x 8” high, chassis type construction
Weight: 30,5 pounds net
Finish: Chrome and Black

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