Zenith's
top-of-the-line stereo receiver, model MC7050, is a tuner/amplifier unit
offering 40 watts of RMS power per channel minimum into 8 ohms, over a
bandwidth of 20 to 20,000 Hz. The Total Harmonic Distortion is put at
0,2percent or less. A loudness compensation switch automatically increases low
and high frequencies for richer sound at low volume levels, while high and low
filters eliminate frequency noise at both ends of the sound spectrum. The tuner
section has tuned RF on FM, a ceramic
filter to eliminate noise and alternate stations interference, a MOS FET
integrated circuit to "Lock In" FM stations and a phase-locked loop
MPX integrated circuit to maintain precise phasing of pilot and subcarrier
signals on FM for low distortion and good stereo separation. Other features
include; tape monitor; tape dubbing; 41-position detent volume control;
11-position detent bass and treble controls; center detent balance control;
A/B/A+B speaker selector; FM mute; headphone and microphone jacks; flywheel
tuning ; separate tuning and signal strength meters.
Specifications
Power Amp Section
Continuous Power
Output: 40 watts pef channel (min. RMS
at 8 Ω, from 20 -20,000 Hz, no more than 0,2% Total Harmonic Distortion)
Total Harmonic
Distortion (20 Hz to 20 kHz from Aux)
Continuous Rated
Power Output : no more than 0,2%
1 watt per Channel
Output
8 Ω : no more than 0,08%
Intermodulation
Distortion (50 Hz : 7,000 Hz = 4: 1, from Aux)
Continuous Rated
Power Output: no more than 0,2%
1 watt per Channel
Power Output
8 Ω : 0,05%
Damping Factor (20
Hz - 20 kHz, 8 Ω): 40
Input
Sensitivity/Impedance:
Phono 1, 2 : 2,5 mV/50 k Ω
Mic : 2,5 mV/50 k Ω
Aux : 150 mV/50 k Ω
Tape Play : 150 mV/50 k Ω
Phono Overload Level
(T.H.D. 0,1%)
Phono : 125 mV 91 kHz)
Output
Level/Impedance
Tape Rec : 150 mV
Headphone : low
impedance
Frequency Response:
Phono (RIAA
equalization) : 30 Hz - 15,000 Hz ±1 dB
Aux, Tape Play
: 20 Hz - 20,000 Hz ±1 dB
Tone Controls
Bass : ±10 dB at 100 Hz
Treble : ±10 dB at 10 kHz
Filters
High : -9 dB at 10 kHz
Low : -6 dB at 100 Hz
Loudness Contour
(Vol. Control set at approx. 40 dB position) :
+10 dB at 100 Hz; +5 dB at 10 kHz
Hum and Noise (IHF,
short-circuited, A network, Rated Power):
Phono : 75 dB
Aux, Tape Play
: 85 dB
FM Section
Usable Sensitivity
Mono : 10,3 dBf (1,8
µV)
Stereo : 19,0 dBf (4,9 µV)
50 dB Quieting
Sensitivity
Mono : 14,8 dBf (3,0 µV)
Stereo : 37,3 dBf (40 µV)
Signal-to-Noise
Ratio
Mono : 70 dB
Stereo : 65 dB
Distortion at 65 dBf
100 Hz 1 kHz
Mono : 0,1%
Stereo : 0,3%
Frequency
Response: 30 Hz - 15 kh ( +0,6 dB -2,0
dB)
Capture Ratio: 1,0 dB
Alternate Channel
Selectivity: 70 dB
Spurious Response
Ratio: 75 dB
Image response
Ratio: 65 dB
IF response
ratio: 90 dB
AM Suppression
Ratio: 60 dB
Muting
Threshold: 19,2 dBf (5,0 µV)
Stereo Separation
At 1 kHz : 45 dB
IHF : 35 dB
Subcarrier product
ratio: 60 dB
SCA Rejection
Ratio: 65 dB
Antenna Input: 300 Ω (balanced), 75 Ω (unbalanced)
AM Section
Sensitivity
IHF Ferrite Antenna
: 200 µV/m
IHF External Antenna
: 15 µV
Selectivity: 40 dB
Signal-to-Noise
Ratio : 50 dB
Image Response
Ratio: 45 dB
IF Response
Ratio: 40 dB
Antenna: Built-in Ferrite loopstick Antenna
Semiconductors: 45 transitors; 27 Diodes; 5 ICs; 1 FET
General section
Power
Requirements: 120 V 60 Hz
Power
Consumption: 280watts
Dimensions (W x H x
D): 19,27" x 14,96" x
5,51"
Weight: 27,5 lbs
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