Zenith MC-7050 receiver

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