What is stereo?

There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.

H.H. Scott '59

Onkyo TX-7000 receiver

The Onkyo TX-7000 Quartz-Locked AM/FM Stereo Receiver is an outstanding example. Both its power amplifier and FM sections are rich with important new design concepts.
The TX-7000's power amplifier provides two major innovations never before present in a stereo receiver. The first is called Super-Servo and it totally eliminates the sonic "ghost signals" common to DC power amplifiers. As a result, each instrument and voice sounds purer and more individually real regardless of volume level. Perhaps for the first time, you'll experience stereo with true depth, spaciousness, and a remarkably discernable third dimension. The second innovation is Linear-Switching which lets us provide Class A amplifier sound quality with Class B power efficiency. Crossover distortion is significantly reduced. And output power is very highly efficient, 90 watts per channel with no mote than 0,02% T.H.D.
The TX-7000's FM section is also clearly superior, picking up weak stations noiselessly and strong stations without distortion.
A unique Human Touch Sensor automatically controls the Quartz-Locked system for more reliable and convenient operaation, releasing the system instantly when it senses your touch on the tuning knob engaging it again as your fingers leave the knob. Special circuits also monitor both channels detecting and cencelling out sound distorting FM signal noise. Other circuits cancel out appliance noise. Digital FM readout, separate bass, mid and treble controls, 2-way tape dubbing facilities, and dozens of other important features are all found in the TX-7000. and the TX-7000 is just one of four new receivers from Onkyo Hear "the secret of Onkyo" hear receivers so advanced, they transcend mere technology.

Amplifier Power: 90 watts per channel, min. RMS, at 8 ohms both channels driven, from 20 - 20,000 Hz no more than 0,02% T.H.D.
Total Harmonic Distortion:
0,02% at rated power
0,018% at 1 watt output
IM Distortion:
0,02% at rated power
0,018% at 1 watt output
Damping Factor:  50 at 8 ohms
Frequency Response:  10 Hz - 30,000 Hz (±1 dB)
RIAA deviation:  20 Hz - 20,000 Hz (±0,3 dB)
Input Sensitivity/Impedance:
Phono :  2,5 mV / 50 k Ω
Tape Play :  150 mV/50 k Ω
Tape Rec :  150 mV/3,5 k Ω (PH)
Phono Overload:  200 mV RMS at 1 kHz, 0,02% T.H.D.
Signal-to-Noise Ratio:
Phono :  76 dB (IHF A weighted, 1 watt output, 5 mV input); 86 dB ( A weighted, 10 mV input)
Tape :  80 dB (IHF A weighted, 1 watt output, 0,5 V input); 96 dB (A weighted)
Residual Hum and Noise:  0,5 mV at min.volume level (A weighted)
Tone Controls:
Bass :  ±13 dB at 100 Hz
Mid :  ±5 dB at 1 kHz
Treble :  ±10 dB at 10 kHz
High :  6 kHz, 12 dB/oct
Subsonic :  10 Hz, 12 dB/oct
Loudness (-40 dB):  +8 dB at 40 Hz;  +5 dB at 20 kHz
FM Tuner Section
Tuning Range:  88 - 108 MHz
Usable Sensitivity:
Mono :  9,8 dBf (1,7 µV)
Stereo :  17,2 dBf (4,0 µV)
50 dB Quieting Sensitivity:
Mono :  14,7 dBf (3,0 µV)
Stereo :  35 dBf (31 µV)
Capture ratio:  1,3 dB
Image Rejection Ratio:  90 dB
IF Rejection Ratio:  100 dB
Spurious Rejection ratio:  95 dB
Signal-to-Noise Ratio:
Mono :  74 dB
Stereo :  68 dB
Alternate Channel Att:  70 dB
Am Suppression Ratio:  55 dB
Harmonic Distortion:
Mono :  0,15%
Stereo :  0,3 %
Frequency Response:  30 Hz - 15,000 Hz (±1,5 dB)
Stereo Separation:   40 dB at 1 kHz;  34 dB at 100 Hz - 10,000 Hz
Muting level:  17,2 dBf (4 µV)
Stereo Threshold:  17,2 dBf (4 µV)
Quartz lock level:  17,2 dBf (4 µV)
AM Tuner Section
Tuning Range:  525 - 1620 kHz
Usable Sensitivity:  25 µV
Image rejection Ratio:  45 dB
IF Rejection ratio:  40 dB
Signal-to-Noise Ratio:  40 dB
Harmonic Distortion:  0,8%
General Section
FM :  300 Ω balanced and 75 Ω unbalsnced
AM :  built-in ferrite core  and external terminal
Semiconductors:  2 FETs, 63 Transistors, 18 ICs, 47 Diodes
Power Supply:  AC 120 V,  220 -240 V, 50/60 Hz
Dimensions (W x H x D):  575 x 146 x 462 mm (22-5/8" x 5-3/4" x 18-3/16")
Weight:  19 kg (41,8 lbs)

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