McIntosh Stereotech 1200 Service Manual

Page 2

1200

PERFORMANCE DETAILS

PREAMPLIFIER AND POWER AMPLIFIER
POWER OUTPUT '

50 watts minimum sine wave
continuous average power out-
put, per channel, both channels
operating into 8 ohms load im-
pedance.

30 watts minimum sine wave
continuous average power out-
put, per channel, both channels
operating into 16 ohms load im-
pedance.

OUTPUT LOAD IMPEDANCE

8 ohms or 16 ohms
RATED POWER BAND

20 Hz to 20,000 Hz

TOTAL HARMONIC DISTORTION

0.2% maximum harmonic distor-
tion at any power level from 250
milliwatts to rated power per
channel across 8 ohms or 16
ohms; both channels operating.

INTERMODULATION DISTORTION

0.2% if instantaneous peak power output is twice

rated power or less per channel with both channels

operating for any combination of frequencies 20 Hz

to 20,000 Hz

FREQUENCY RESPONSE

20 Hz to 20,000 11 dB

NOISE AND HUM

Power Amplifier: 95 dB below rated output

Tape 1 and Tape 2, Aux 1 and Aux 2: 89 dB below

rated output

Phono 1 and Phone 2: 70 dB below 10 mV input
RATINGS

DAMPING FACTOR

48 at 8 ohms output

96 at 16 ohms output

INPUT SENSITIVITY AND IMPEDANCE

Power Amplifier: 1.2 volts, 40,000 ohms

Phone 1 and Phono 2:' 3.0 mV, 47,000 ohms

Tape 1 and Tape 2: 350 mV, 100,000 ohms

Aux l and Aux 2: 350 mV, 100,000 ohms

TAPE OUTPUT

Preamp: 12 volts with rated input

Tuner: 1.2 volts at 100% FM modulation

Tape: 350 mV with rated input from low level inputs

Phone: [.2 volts with 10 mV input at 1000 Hz

TONE CONTROLS: Bass :16 dB at 20 Hz. Treble
:16 dB at 20,000 Hz.

L.F. FILTER: Active filter with 12 dB per octave
roll off below 50 Hz, down 18 dB at 20 Hz.

H.F. FILTER: Active filter with 12 dB per octave
roll off above 7000 Hz. down 18 dB at 20,000 Hz.

AM TUNER
TUNING RANGE: 535 to 1605 kHz.
SENSITIVITY: 75 11V IHF (external am.)

SIGNAL TO NOISE RATIO: 50 dB minimum
(lHF,) 60 dB at 100% modulation.
HARMONIC DISTORTION: Less than 1% UHF.)

IMAGE REJECTION: Greater than 60 dB 535 to
1605 kHz.

FM TUNER

TUNING RANGE: 87.5 to 108.5 MHz.

USEABLE SENSITIVITY: 2.5 microvolts at 100%
modulation (:75 kHz deviation) for 3% total noise
and harmonic distortion (IHF).

SIGNAL T0 NOISE RATIO: 70 dB below 100%
modulation.

HARMONIC DISTORTION: Less than 0.5% mono
and less than 0.7% stereo.

AUDIO FREQUENCY RESPONSE: 1l dB 50 Hz
to 10,000 Hz, :2 dB 20 Hz to 15,000 Hz.
SELECTIVITY: 55 dB alternate channel minimum
(IHF)

SPURIOUS REJECTION: 90 dB minimum (1H F)
IMAGE REJECTION: 70 dB minimum

STEREO SEPARATION: 35 dB minimum at 1,000
Hz.

SCA FILTER: 60 dB minimum

GENERAL INFORMATION

POWER REQUIREMENTS: 120 volts 50-60 Hz 50
watts at zero input, 320 watts rated output.

SEMICONDUCTOR COMPLEMENT: 68 Transis-
tors; 4 FETs, 5 le, 39 Diodes.

MECHANICAL INFORMATION

SIZE: Front panel measures 17-1/2 inches wide (444
mm), by 5-5/32 inches high (131 mm). Chassis meas-
ures 16-15/ 16 inches wide (430 mm), by 4-5/8 inches
high (117 mm), by 15-7/8 inches deep (403 mm) plus
antenna. Knob clearance required is l-l/2 inches
(31 mm) in front of the mounting panel.

WEIGHT: 33 pounds (14.97 kg) net, 39 pounds
(17.69 kg) in shipping cartons.

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