McIntosh MC 2505 Brochure

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IIItInlnsh

MC 2505

PERFORMANCE-New Leadership in High Power-Low Distortion Amplification.
RELIABILITY-New Leadership in Consistent Performance and Long Term Protection.
APPEARANCE-New Leadership in Conservative, Predicted Styling for long Design Life.

PROTECTION-Continued Leadership in Customer Protection with the Exclusive
McIntosh Three Year Factory Service Contract.

GUARANTEE-Same McIntosh Leadership in guarantees, McIntosh not only
Guarantees manuiacturing and workmanship but also Guarantees
to be as advertised. No one ELSE will make such a guarantee.

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Theres a Dramatic Difference
in music heard through a

You will hear music as never before! New performance stand-
ards have been set by the new innovations in Solid State de-
velopment by McIntosh. Hear new beauty and subtle delicate
passages of music that until now have been clouded by lower
performance standards.

McINTOSH ENGINEERING MAKES THE STARTLING DIFFERENCE

1. 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 Mclntosh model MC 2505 matches any speaker impedance of 4,
8. or 16 ohms with full rated power. The newly designed McIntosh unity
coupled auto former provides proper matching for all speakers or cross-
over networks. The auto former provides optimum speaker damping for
precise control of overshoot and maximum clean bass response. Damp-
ing factor is Greater than 25 at 4 ohms, greater than 40 at 8 ohms,
greater than 11 at 16 ohms.

2. 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 [he McIntosh
POWER MONITOR METERS. Careful engineering has produced peak look»
ing 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.

3. FIRST SOLID STATE POWER AMPLIFIER WITH McINTOSH PANLOC
FRONT PANEL MOUNTING.

The McIntosh MC 2505 mounts conveniently in a panel with "panloc
mounting shelves.

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SPECIFICA IONS for llltlnlush MC 2505 and MC 250

MC 2505 ELECTRICAL SPECIFICATIONS:
POWER OUTPUT:

50 watts RMS continuous power per channel. both
channels operating into 4 ohms. 8 ohm or 16 ohm
loads.

HARMONIC DISTORTION:

Less than 0.25% at rated power Output from 20 Hz
to 20 kHz. Both channels operating. Distortion typl
cally measures less than 0.1%. Distortion decreases
as output [Ewer is reduced.

INTERMODULATION DISTORTION:

Less than 0.25% tor any combinations of frequen-
cies between 20 Hz and 20 kHz at 910 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

+0. -.25dt) 20 H7 through 20 kllz

AI reduced power

+0, - 3dh 10 Hz through 100 kHz

OUTPUT IMPEDANCE:

4 ohm. 8 ohm, and 16 ohm. Full rated power output
is provided at each output tap. The 16 ohm output
will provide 25 volts RMS tor constant voltage multi-
ple speaker distribution lines.

OUTPUT DAMPING FACTOR:

Greater than 25 at 4 ohms

Greater than 40 nt 8 ohms

Greater than 11 at 16 ohms

INPUT SENSITIVITY AND IMPEDANCE:

0.5 volts WI produce rated power output: a gain
control is provided for each channel allowrng Inde-
pendent adiustmnnt of amplification in each channel.
Input impedance is 200,000 ohms.

HUM AND NOISE:

Greater than 90dh hclow rated output.

OUTPUT POWER MONITOR METER:

Meter is calibrated to read + 3db when amplifier pro:
duces rated output. Meter range switch is provided
to increase inetnr sensitivity by IOdb or 2001b.

mum-«Stu LIHuLR

HEADPHONE OUTPUT:
Designed tor low impedance headphones.

CONTROLS:
Power on-oft switch, speaker tin-oft 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
at the output loads, or by any amount of the output
impetIHnCr. mismatch. Thermal cutouts are maunted
on thi': output transistor heat sinks to provide protec-
tion in the event of inadequate ventilation.

SEMICONDUCTOR COMPLEMENT:
28 silicon transistors
32 silicon rectifiers and diodes

POWER REQUIREMENTS:
117 volts AC 50-60 Hz. 75 watts at zero signal out-
put, 250 watts at rated output.

MC 2505- MECHANICAL SPECIFICATIONS:
SIZE: Front panel. 16" wide by 57" high: chassrs
I5" wrde by 4Vz" high by 13" deep. including con-
nectors. Clearance in front of maunting panel In-
cluding knobs. 1 V2.

FINISH: Front Panel: Anodimd gold and black.
CHASSIS: Chrome and black.

MOUNTING: Convenient, prolcssional PANLOC.
WEIGHT: 38 pounds net. 53 pounds in shipping car-
ton,

MC 250 MECHANICAL SPECIFICATIONS:
SIZE: 7W." high. 105/." wide, 15%" deep.
CHASSIS: Chrome and black.

WEIGHT: 35 pounds net. 40 pounds in shipping car-
ton,

III[ I "to 5 h LABORATORY INC.