McIntosh MA- 5100 (1966-1972)

The MA 5100 delivers McIntosh performance and quality in a combination solid state preamplifier and and solid state power amplifier. The stereo preamplifier has the lowest hum and noise of any combination unit. The square wave rise time is 3 microseconds.

With the MA 5100 RMS (continuos) music is reproduced accurately. There is no fuzziness. At full 45 watts power output, distortion is less than 0,25% from 20 to 20,000 Hz. Distortion is reduced as power is reduced. Here is adequate power to give you the sound of real live music in your home.

The silicon rectifier power supply gives instant voltage to the amplifier when needed. Recovery from the loudet musical passage is immediate. Your music sounds alive and thrilling played through the MA 5100. It is the perfect answer for the owner who wants the best in a power amplifier and the best in a preamplifier inn the smallest space.

PERFORMANCE LIMITS

POWER OUTPUT:

45 RMS watts continuos per channel into 4 or 8 ohms both channels operation,

35 RMS watts continuos per channel into 16 ohm both channels operating

HARMONIC DISTORTION:

Will not exceed 0,25% at any power level to rated power output per channel from 20 to 20,000 Hz, both channels operating. Typical performance is less than 0,1% at rated power. Distortion decreases as output power is reduced

INTERMODULATION DISTORTION:

Will not exceed 0,25% if instantaneous peak power output is twice rated power or less perchannel with both channels operating for any combination of frequencies 20 to 20,000 Hz

FREQUENCY RESPONSE;

10 - 25,000 Hz +0 -0,5 dB at rated power

8 - 50,000 Hz +0 -3,0 dB at one half rated power

HUM AND NOISE:

High Level inputs,75 dB below rated output

Low Level Inputs 70 dB below 10mV input equivalent to less than 3 microvolts at input

OUTPUT IMPEDANCE:

4, 8, or 16 ohms

DAMPING FACTOR:

50 at 4 ohms, 100 at 8 ohms, 200 at 16 ohms

INPUT IMPEDANCE AND SENSITIVITY:

High Level inputs, 0,3 volts, 250,000 ohms

PHONO; 2 millivolt at 47,000 ohms (1,000Hz)

TAPE HEAD; 2 millivolts at 500,000 ohms (500 Hz)

TAPE OUTPUT:

0,3 volts from low level inputs,to operate into 47,000 ohms or more

LEFT PLUS RIGHT OUTPUT:

Adjustable 0 to 6 volts from generatoe impedance of 5,000 ohms

BASS AND TREBLE CONTROLS

Concentric controls, friction clutch for independent adjustment of each channel

HF FILTER: Flat or 5000 Hz cutoff

LF FILTER: Flat or 50 Hz cutoff

SEMICONDUCTOR COMPLEMENT:

23 Silicon Rectifiers and Diodes

34 Silikon Transistors

2 Silicon Bilateral Switches

2 TRIAC

POWER REQUIREMENTS:

117 volts, 50/60 Hz, 70 watts at zero signal output, 200 watts at rated output

FACILITIES

TAPE MONITOR:

NORMAL or Tape MONITOR with indicator lamp in MONITOR position

PHASE:

Normal (0⁰) or reverse (180⁰)

SPEAKER:

Speakers ON or OFF for headphone listening, with indicator lamp in SPEAKER OFF position

HEADPHONE JACKS:

Two, for two pairs of low impedance stereo headphones

SIZE:

Front panel, 16 inches wide by 5-7/16 inches high; chassis, 15 inches wide by 4½ inches high by 14½ inches deep, including connectors. Clearance in front of mounting panel including knobs, 1½ inches

FINISH:

Front panel gold anodized and black with special McIntosh gold/teal panel nomenclature illuminations.

CHASSIS:

Chrome and black

WEIGHT:

25 pounds net, 41 pounds in shipping carton.