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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 3500


The McIntosh MC 3500 sets a new precedent in high power performance and flexibility.
Many years of diligent research, space age product advances and careful examinations  of new developments in component parts have lead to the McIntosh MC 3500, a new Laboratory Standard.
The quality performance that is demanded in the scientific laboratory  is your for the highest performance in a home music system.

McIntosh  developed the first low distortion, high quality, high powered amplifier in 1947. the secret then was the Unity Coupled circuit and Bifilar Output Transformer.
The MC 3500 has made another new advance. Again transformer design has made the difference. A new output transformer with 5 primary windings, interleaved with the secondary to give you maximum output, lowest distortion, multiple output impedance for any type type of sound distribution requirement. The new McIntosh Pentafilar output transformer and Unity Coupled circuit means lowest distortion, flat power response, long, trouble free cooler operation at high power.

McIntosh has produced the answer to the majority of sound problems. With the McIntosh MC 3500, your music system will produce music as never before. All the instruments will be reproduced with clarity and accuracy. No more will you hear just a barrage of sound. Now you will hear each instrument clearly and cleanly without the cloudiness produced by the lack of power in the amplifier. The McIntosh MC 3500 is the ultimate in high power amplifiers.

Specifications
Power Output:  350 RMS watts continuous
Harmonic Distortion:  0,15% at 350 watts power output from 20 Hz to 20 kHz. Typical performance is less than 0,1% at rated power. Distortion decreases as output power is reduced.
Frequency Response:  20 Hz - 20,000 Hz (+0 -0,1 dB at rated output); 7 Hz - 70,000 Hz (+0 -3,0 dB at 1 watt)
Noise and Hum:  95 dB below rated output
Output Impedance and Voltage:  1 Ω/ 17,3 V; 4 Ω/35,8 V; 8 Ω/53 V; 16 Ω/75 V; 50 Ω/132V; 64 Ω/150 V. may be operated isolated from ground. (1 Ω/17,3 V output is rated to 300 watts, and 4 Ω/35,8 V output is rated to 320 watts)
The 75 Volt output is used to power 70,7 V sound distribution lines. The 150 V output is used to power 141,4 V distribution Lines. The 132 Volt output is used to provide 117 V for laboratory or industrial applications.
Internal Impedance:  about 5% of rated load Impedance. The 1 Ω/17,3 V output is rated about . 1 Ω
Input Impedance:  200,000 Ω
Input Sensitivity:  1,1 volts. Level control provided for higher input voltages.
Power Requirement:  117 volts AC 50/60 Hz, 400 watts at zero signal output:  900 watts at rated output.
Solid State Complement:  3 Silicon Transistors; 2 Silicon Zener Diodes; 3 Germanium Diodes; 9 Silicon Retifiers and Diodes
Tube Complement:  2 x 12AX7; 2 x 6DJ8; 1 x 6CG7; 1 x 6BL7; 8 x 6LO6
General
Dimensions:
Front panel :  10-1/2" (high), 19" (wide)
Chassis :  17" behind panel including connections
Knobs project 2" in front of panel.
Finish:
Front panel :  Gold anodized aluminum and black
Chassis :  Chrome and black
Weight (Chassis only):  125 pounds (shipping 135 pounds)


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