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Performance Details - McIntosh 1200 Service Information

Stereotech am/fm receiver

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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 ±1 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 Phono 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
Phono 1 and Phono 2: 3.0 mV, 47,000 ohms
Tape 1 and Tape 2: 350 mV, 100,000 ohms
Aux 1 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
Phono: 1.2 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 juV IHF (external ant.)
SIGNAL TO NOISE RATIO: 50 dB minimum
(IHF,) 60 dB at 100% modulation.
HARMONIC DISTORTION: Less than 1% (IHF.)
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 TO NOISE RATIO: 70 dB below 100%
modulation.
HARMONIC DISTORTION: Less than 0.5% mono
and less than 0.7% stereo.
AUDIO FREQUENCY RESPONSE: +1 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 (IHF)
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 ICs, 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 1-1/2 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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