McIntosh MX 115 Service Manual
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Extracted text from McIntosh MX 115 Service Manual (Ocr-read)
Page 1
mtlniush
MX 715
FM TUNER PREA MP
SERVICE INFORMATION
STARTING WITH SERIAL N0. ABIOOI
McINTOSH LABORATORY INC. 2 CHAMBERS STREET BINGHAMTON, NEW YORK
Sll XW
Page 2
10X 115
ELECTRICAL SPECIFICATIONS
FM TUNER SECTION
USEABLE SENSITIVITV
2.5 microvolts at 1007 modulation (:75 kHz
deviation) for 3% total noise and harmonic
distortion IHF.
SIGNAL TO NOISE RATIO
70 dB below 100% modulation.
CAPTURE RATIO
1.5 dB minimum.
HARMONIC DISTORTION
Mono: Does not exceed 0.3% at 100%
modulation :75 kHz deviation.
Stereo: Does not exceed 0.7%.
AUDIO FREQUENCY RESPONSE
11 dB 20 Hz to 15,000 Hz with standard
de-emphasis (75 usec.) and 19,000 Hz
pilot filter.
SELECTIVITY
ADJACENT CHANNEL:
6 dB minimum IHF in NORMAL Position.
15 dB minimum IHF in NARROW Position.
ALTERNATE CHANNEL:
58 dB m imum IHF in NORMAL Position.
88 dB minimum IHF in NARROW Position.
SPURIOUS REJECTION
90 dB IHF minimum.
IMAGE REJECTION
95 dB minimum, 88 MHz - l08 MHz.
STEREO SEPARATION
35 dB at 1,000 Hz.
SCA FILTER
50 dB rejection From 67 kHz to 70 kHz.
275 dB per octave slope.
PREAMPLIFIER SECTION
FREQUENCY RESPONSE
10.5 dB, 20 Hz to 20,000 Hz.
DISTORTION
Less than 0.17 at 2.5 volts 20Hz to 20 kHz.
INPUT SENSITIVITY (phono I and phone 2)
2 millivolts For 2.5 Volts output at I kHz.
INPUT SENSITIVITY (aux, tape)
0.25 volts For 2.5 volts output.
HUM AND NOISE (phono l and phone 2)
72 dB below 10 millivolt input.
HUM AND NOISE (aux, tape)
85 dB below rated output.
OUTPUT (main)
2.5 volts with rated input. Up to 10
volts can be developed without distor-
tion. FM and AM will produce up to 10
volts output at 100% modulation.
OUTPUT (tape)
0.25 volts with rated input. Phono input
signal of 10 millivolts produces 1.2 volts
output. FM and AM will produce l.2 volts
output at 100% modulation.
OUTPUT (center channel)
2 volts with rated input to both channels.
BASS CONTROL
-18 dB to +16 dB at 20 Hz.
TREBLE CONTROL
iZO dB to 20,000 Hz.
LF FILTER
Flat or roll off below 50 Hz, down 12 dB
at 20 Hz.
HF FILTER
Flat or roll off above 5000 Hz, down 12 dB
at 20,000 Hz.