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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 MC2505 power amplifier


Solid State Power Amplifier

New performance standards have been set by the new innovations in Solid State development by McIntosh. Hear new beauty and subtle delicate passages of music that until now have been clouded by lower performance standards.

 

First Solid State Power Amplifier with Full Power of 50 watts per channel at all speaker impedances of 4, 8 and 16 ohms

The new McIntosh model MC 2505 matches any speaker impedance of 4, 8  or 16 Ω  with full rated power. The newly designed McIntosh unity coupled auto former provides proper matching for all speakers or crossover networks. The auto former provides optimum speaker damping for precise control of overshoot and maximum clean bass response. Damping factor is greater than 25 at 4 Ω , greater than 40 at 8 Ω ,, greater than 11 at 16 Ω .

 


First Solid State Power Amplifier using Precision Calibrated Output Level Meters

The Calibrated Power Level Meters provide continuous indication of how much power is being delivered to the speakers. The meter can be used for measuring other elements of your stereo system. These are not ordinary meters. McIntosh has again LED with a new concept in a meter circuit design.

Normal meter operation is frequency discriminating. Not so the McIntosh Power Monitor Meters. Careful engineering has produced peak locking meters with a Time Stretching Circuit, that permits the meter to follow peak program material with an accuracy better than 2%. You can now know the complete performance of your music system.

 


First Solid State Power Amplifier with McIntosh "Panlock" front panel mounting

The McIntosh MC2505 mounts conveniently in a panel with "Panlock" mounting shelves.

 

First Solid State Basic Power Amplifier with McIntosh "Performance Reliability" Sensor Circuits

New McIntosh "performance Reliability" sensing circuits assure constant year-to-year performance of your solid-state amplifier under all types of use conditions. Instantaneous electronic sensing of amplifier output and load conditions rigidly maintains top amplifier performance. Ther are no fuses in speaker line to worry with and no special backup caution needed. A thermal-sensing unit on each oversized heat sink gives additional reliability control.

 


Specifications

Power Output:  50 watts RMS continuous power per channel, both channels operating into 4 Ω , 8 Ω  or 16 Ω  loads

Total Harmonic Distortion:  less than 0,25% at rated power output from 20 Hz to 20 kHz. Both channels operating. Distortion typically measures less than 0,1%. Distortion decreases as output power is reduced.

Intermodulation Distortion:  less than 0,25% for any combination of frequencies between 20 Hz and 20 kHz at 210 peak watts output per channel or at any level less than 100 peak watts per channel. Both channels operating

Frequency Range: 

at rated output both channels operating :  20 Hz through 20 kHz +0 -2,5 dB

At reduced power :  10 Hz through 100 kHz +0 -3 dB

Output Impedance:  4 , 8 and 16 Ω .full rated power output is provided at each output tap. The 16 Ω  output will provide 25 volts RMS for constant voltage multiple speaker distribution lines.

Output Damping Factor:  greater than 25 (at 4 Ω ), 40 (at 8 Ω ), 11 (at 16 Ω )

Input Sensitivity and Impedance:  0,5 volts will produce rated power output; a gain control is provided for each channel allowing independent adjustment of amplification in each channel. Input impedance is 200,000 Ω

Hum and Noise:  greater than 90 dB below rated output

Output Power Monitor Meter:  Meter is calibrated to read +3 dB when amplifier produces rated output. Meter range switch is provided to increase meter sensitivity by 10 dB or 20 dB.

Headphone Output:  Designed for low impedance headphones

Controls:  Power on-off switch, speaker on-off switch, left gain, right gain, meter range switch.

Special Features:  The amplifier is completely stable when connected to any loudspeaker system or reactive loads. The MC 2505 has special circuitry to prevent damage by inadvertent or intentional short circuit or open circuit of the output loads, or by any amount of the output impedance mismatch. Thermal cutouts are mounted on the output transistor heat sinks to provide protection in the event of inadequate ventilation.

Semiconductors:  28  silicon transistor; 32 silicon rectifiers and diodes

Power Requirements:  117 Volt AC 50/60 Hz

Power Consumption:  75 watts at "Zero" signal output; 250 watts at rated output

Dimensions

Front Panel (W x H):  16" x 5-7/16"

Chassis (W x H x D) :  15" x 4-1/2" x 13" (including connectors. Clearance in front of mounting panel including knobs, 1-1/2"

Weight:  38 pounds (net), 53 pounds(shipping)

Finish:  Front panel Anodized gold and black

Chassis:  Chrome and black

Mounting :  Convenient, professional Panlock

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