McIntosh MA-5100 Service manual

MA

PREAMP - AMPLIFIER

5100

SERVICE INFORMATION

STARTING

MclNTOSH LABORATORY INC. 2 CHAMBERS STREET BINGHAMTON, NEW YORK

WITH

SERIAL

NO.

21HOO

MA 5100

MA

5100

ELECTRICAL SPECIFICATIONS

Power Output:

90 watts RMS continuous, 45 watts per channel operating simultaneously into
4 ohm or 8 ohm loads.

60 watts RMS continuous, 30 watts per channel operating simultaneously into
16 ohm loads.

Harmonic Distortion:

Less than 0.25% at rated power output from 20Hz to 20,000Hz with both chan-

nels operating.

Intermodulation Distortion:

Less than 0.25% for any combination of frequencies from 2QHz to 20,000Hz
if instantaneous peak power is 90 watts per channel or less into 4 or 8 ohm
loads and 60 watts per channel or less into 16 ohm loads with both channels
operating.

Frequency Range:

At rated output both channels: ±0.5dB 20Hz through 20,000Hz.

Output Impedance:

4 ohm, 8 ohm, 16 ohm. No impedance switching required.

Internal Impedance/Damping:

Less than .04 ohms; damping factor greater than 100.

Input Sensitivity And Impedance:

Auxiliary, Tape, Tuner, and Tape Monitor: 300mV, 250K ohms.
Phono 1 and Phono 2: 2mV, 47,000 ohms.
Tape Head: 2mV, 1/2 megohm.

Hum And Noise:

High Level Inputs: 75dB below rated output.
Low Level Inputs: 70dB below 10mV input.
Power Amplifier: 90dB below rated output.

Tape Output:

300mV at rated sensitivity, 1.4 volts with 10mV at phono input.

Left Plus Right Output:

Adjustable

Bass Controls:

+18dB at 20Hz.

Treble Controls:

+l8dB at 20,000Hz.

0 to 6

volts from generator impedance

of

less than

5,000

ohms.

HF Filter:

Flat, or 5,000Hz cutoff.

LP Filter:

Plat, or 50Hz cutoff.

Power Requirements;

117 volts AC, 50-60Hz, 70 watts at zero signal output, 200 watts at rated
output.

MA

5100

DIAGRAM

BLOCK

5100
MA

MA

5100

043-989

PREAMP. SECTION PRINTED CIRCUIT BOARD