FM
USABLE SENSITIVITY: Better than 2.5 microvolts at 100%
modulation (±75 kHz deviation) for less than 3% total
noise and harmonic distortion (IHF)
FREQUENCY RESPONSE: ±1 dB (fom 20 Hz to 20,000 Hz
with standard de-emphasis and 19,000 Hz pilot filter
HARMONIC DISTORTION: Mono, less than 0.5% at 100%
modulation ±75 kHz deviation
IMAGE REJECTION: Better than 80 dB at 100 MHz better
than 70 dB at 105 MHz
SPURIOUS REJECTION; Better than 100 dB
CAPTURE RATIO: Better than 1.8 dB
DRIFT: Less than 25,000 Hz
HUM AND NOISE: Better than 65 db below 100% modu-
lation
TUNING INDICATOR: Electron Ray for simple accurate
center of channel tuning
STEREO INDICATOR: Stereo light activated by 19 kHz
carrier only
PREAMPLIFIER SPECIFICATIONS
FREQUENCY RESPONSE: ±0.5 db 20 to 20,000 Hz
DISTORTION: Less than 0.1% at 2.5 volts output, 20 to
20,000 HZ
INPUT SENSITIVITY AND IMPEDANCE: PHONO 1 and
PHONO 2: 2 millivolts at 47,000 ohms for 2.5 volts
output
AUX TAPE: .25 volts at 250,000 ohms for 2.5 volts
output
HUM AND NOISE: PHONO 1 and PHONO 2: 70 dB below
10 millivolt input: equivalent to less than 3 microvolts
at the input terminals
AUX-TAPE: 85 dB below rated output
OUTPUT: MAIN: 2.5 volts with rated input. Up to 10 volts
can be developed without distortion
SPECIFICATIONS
TAPE: 2.5 volts with rated input
L+ Ft: 2.0 volts with rated Input
OUTPUT IMPEDANCE: MAIN: 200 ohms, designed to
operate into 47,000 ohms or more
TAPE OUTPUT: About 200 ohms, designed to operate
into 47,000 ohms or more
(L + R): About 1,200 ohms, designed to operate into
47,000 ohms or more
SEMICONDUCTOR COMPLEMENT:
3 Field Effect Transistors
26 Silicon Planar Transistors
3 Integrated Circuits and Monolithic Amplifier
13 Signal Diodes
2 Zener Diodes
4 Rectifiers
1 Tuning Indicator — 6HU6
POWER REQUIREMENTS: 117/125 volts, 50.60 Hz, 30
watts.
MECHANICAL SPECIFICATIONS
SIZE: Front panel: 16 inches wide by 5
1
/
16
inches high:
Chassis: 15 inches wide by 13 inches deep, including
PANLOC shelf and back panel connectors; Knob Clear-
ance: 1½ Inches in front of mounting panel
WEIGHT: 24 pounds net, 36 pounds in shipping carton
FINISH: Front panel: Anodized gold and black with special
gold/teal panel nomenclature illumination
CHASSIS: Chrome and black
MOUNTING: Mclntosh developed professional PANLOC
FACILITIES
BASS CONTROL: - 2 0 dB to + 16 dB at 20 Hz. Clutch
coupled controls for independent adjustment of each
channel
TREBLE CONTROLS: ±20 dB at 20,000 Hz. Clutch
coupled controls for independent adjustment of each
channel
LOUDNESS: Flat response, or compensated for low listen-
ing levels
BALANCE: When program material is out of balance, ro-
tation of the balance control returns the program to
natural balance
VOLUME CONTROL: Precision "tracked" to —60dB so
that proper stereo balance is maintained. AC ON/OFF
switch is coupled with the volume control
TAPE MONITOR SWITCH: Push button; compares re-
corded tape with program source while recording
VOLTAGE AMPLIFICATION:
AUX, TAPE
To MAIN output 20 dB
To TAPE output 0 dB
PHONO 1, PHONO 2
To MAIN output 62 dB
To TAPE output 42 dB
AC OUTLETS:
1 unswitched (Red)
2 switched
LF FILTER: Flat, or roll-off below 50 Hz, 6 dB per octave,
down 12 dB at 20 Hz
HF FILTER: Flat, or roll-off above 5 kHz, 6 dB per octave,
down 12 dB at 20,000 Hz
INPUT SELECTOR: 6 positions: AUX (auxiliary or spare),
TAPE. AM, FM, PHONO 1, and PHONO 2
MODE SELECTOR: Pushbutton, STEREO, or MONO
SECONDARY CONTROLS
PHASE CONTROL: Electronically reverse phase in the left
channel to correct "out of phase" program sources
MUTING ADJUST: Modifies the noise rejection threshold
DIAL SCALE INTENSITY; Modifies the briteness of the
illumination of the front panel
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