McIntosh MI 350 Service Manual

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MI-350

SERVICE INFORMATION

STARTING WITH SERIAL N0. TOROI

MclNTOSH LABORATORY INC. 2 CHAMBERS STREET BINGHAMTON, NEW YORK

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ELECTRICAL SPECIFICATIONS

POWER OUTPUT 350 watts continuous at 8, 16, 50, 6h

ohms, 325 watts continuous at h ohms,
300 watts continuous at 1 ohm.

FREQUENCY RESPONSE 20Hz to 20kHz +0, ~0.5dB at 350 watts

output. 1H2 to 70kHz +0, -3dB at 1
watt output.

HARMONIC DISTORTION Less than 0.15% at rated output or
less, 20Hz to 20kHz.

INTERMODULATION DISTORTION Less than 0.15%

NOISE AND HUM LEVEL -95dB

INPUT LEVEL 1.1 volt

OUTPUT IMPEDANCE 1, u, 8, 16, 50, and 6s ohms.

OUTPUT VOLTAcEs 17.3, 35.8, 53, 75, 132, 150 volts.

AC POWER INPUT 117/125 Volts, SO/éOHZ, hDO-9OO watts.

SCHEMATIC NOTES

Unless otherwise specified, resistance values are in ohms,
1/2 watts, and 10% tolerance. Capacitance values smaller
than 1 are in microfarads (uF); values greater than 1 are
in picofarads (pF). Inductors, unless otherwise specified,
are in microhenries (pH).

The terminal numbering of rotary switches and printed circuit
board wires is for reference only.

All voltages are measured under the following conditions:
Use of an 11 megohm input impedance VTVM voltmeter.

All voltages 110% with respect to chassis ground.

No signal at input terminals.

AC input at 117 volts, 50/60 cycles.

Front panel controls at:

gain fully counterclockwise
meter range off

power on

output range fully counterclockwise

In units with serial Numbers below lORSh: Ll through L8
are not used; Rllu is 8209 5% 1/2w; and 0207D is used.

Cé is used in early units.

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14 l.