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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





Carver MXR-130 The Receiver

 The Carver Receiver
When Bob Carver designs a receiver you can be sure it is like no other. To give you the power you need for today's recording advances plus virtually noise-free stereo FM reception. Carver has designed a receiver with astonishing performance. This extraordinary instrument incorporates two of the high fidelity art.'s most advanced technological breakthroughs: Bob Carver Magnetic Field Power Amplifier and his Asymetrical Charge Coupled FM Detector.
With the Carver Receiver you command 130 watts per channel and fully digital quartz synthesized AM-FM stereo tuner through a highly sophisticated and meticulously engineered premplifier section.
 Live music is full of lighting-fast transients, combinant crests of demand created by multiple music waveforms and high intensity peaks. To reproduce the full sound of the music now made possible by the most recent recording advances in fine analog recordings and especially Digital Audio Discs, your system needs large amounts of power to accomodate the dynamic range without distortion.
The Magnetic Field Amplifier in the Carver Receiver gives you 130 watts per channel of pure clean power so you can truky appreciate the music.
The technological elegance of the Magnetic Field Amplifier enebles it to produce large amounts of power without the need for heavy heat sinks, massive transformers, and enormous power capacitors required by conventional amplifier design.
Unlike conventional amplifiers which produce a constant high voltage level at all times, irrespective of the demands of the ever-changing audio signal and indeed even when there is no audio signal in the circuit at all the Magnetic Field Amplifer's power supply is signal responsive and highly efficient. It produces exactly and only the power needed to carry the signal with complete accuracy and fidelity.
 The Carver receiver gives you FM stereo performance unmatched by that of any other receiver.
As it is transmitted from the station, the stereo FM signal is extremely vulnerable to distortion.noise, hiss and multipath interference. In fact because of the transmission system in use today the signal to noise ratio of FM stereo has been degraded fifteen times (more than 23 dB).
However, when you engage Carver's Asymetrical Charge Coupled FM Detector circuit, the stereo signal arrives at your ears virtually noise-free. You hear fully separated stereo with space depth and ambience.
You will also appreciate the AM section. Meticulous attention to every aspect of tuner performance gives you an AM section with true high fidelity response. You will not find another receiver with such high performance anywhere.
The Craver Receiver has been designed for serious music listeners who seek fidelity accuracy and musicality.
Specifications
FM Section
System:  PLL Crystal-Locked Digital Synthesizer System
Tuning Range:  87,5 - 108 MHz
Antenna:  75 Ω unbalanced and 300 Ω balanced
Intermediate Frequency:  10,7 MHz
Frequency Response:  20 - 15,000 Hz ±1 dB
Alternate Channel Selectivity:  58 dB
Capture Ratio:  ±1,5 dB
AM Suppression Ratio:  75 dB
IF Response Ratio:  100 dB
Spurious Response Ratio:  100 dB
Output Level (7,5 kHz Dev.):   700 mV, 600 Ω
Usable Sensitivity Mono :
  75 Ω :  11,3 dBf /1,0 µV
300 Ω :  11,3 dBf /2,0 µV
Usable Sensitivity Stereo :
Without Charge Coupled Detector : 
 75 Ω :  34 dBf / 14 µV
300 Ω : 34 dBf / 28 µV
With Charge Coupled Detector : 
 75 Ω :  16,3 dBf / 78 µV
300 Ω : 16,3 dBf / 57 µV
50 dB Quieting Sensitivity Mono :
75 Ω : 16,1 dBf / 1,7 µV
300 Ω :  16,1 dBf/ 3,4 µV
50 dB Quieting Sensitivity Stereo :
Without Charge Coupled Detector : 
 75 Ω :  37 dBf / 19 µV
300 Ω : 37 dBf / 39 µV
With Charge Coupled Detector : 
 75 Ω :  23,5 dBf / 4,0 µV
300 Ω : 23,5 dBf / 8,0 µV
Signal-to-Noise Ratio Mono :
75 Ω :  82 dB at 85 dBf
300 Ω :  82 dB at 85 dBf
Signal-to-Noise Ratio Stereo
Without Charge Coupled Detector : 
 75 Ω :  74 dB at 85 dBf
300 Ω : 74 dB at 85 dBf
With Charge Coupled Detector : 
 75 Ω :  85 dB at 85 dBf
300 Ω : 85 dB at 85 dBf
Stereo Separation (Wide) [Without Charge Coupled Detector /With Charge Coupled Detector]
45 dB / 45 dB at 1 kHz
36 dB / 30 dB at 100 Hz
36 dB / 25 dB at 10 kHz
AM Section
Tuning Range:  520 - 1710 kHz
IF Rejection Ratio:  45 dB
Output level at 1khz:  160 mV ±2,5 dB
Pre-Amplifier Section
Phono RIAA :  ±0,25 dB
Phono S/N Ratio:  50 dB ref. 5 mV
Input  Impedance
Phono:  50 k Ω
Video/DAD:  50 k Ω
Aux:  50 k Ω
Tape 1, 2 : 50 k Ω
Total Harmonic Distortion: 
20 Hz :  0,05%
1 kHz :  0,05%
20 kHz :  0,05%
Frequency Response:  20 Hz - 20 kHz ±0,5 dB
Tone Controls
Bass :  ±10 dB at 100 Hz
Treble :  ±10 dB at 10 kHz
Midrange :  ±6 dB at 1,5 kHz
High Filter:  5 kHz (6 dB/oct) -3 dB point
Power Amp Section
Power output 20 Hz - 20 kHz:  130 W both channels into 8 Ω
THD at Rated Power:  0,05%
IM Distortion:  0,1% SMPTE
TIM Distortion:  Unmeasurable
Frequency Response:  20 Hz - 20 kHz ±0,5 dB
Damping Factor:  60
Noise:  better than 100 dB IHF-A weighted

Power Supply:  120 V 50/60 hz
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