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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





Cyrus One amplifier

The Cyrus One is based on a revolutionary circuit design philosophy, details of which are beyond the scope of this blog and in any case well guarded secrets. The design is then implemented with careful attention to circuit topology in order to minimise the number of components in the signal path and reduce their harmful effects. This 'straight-line" design is then manufactured to the very highest standards using components and materials beyond the reach of most competition. The power transistors, for example, are military grade, ultra-fast and very linear devices especially manufactured for Cyrus Electronics. The driver transistors are equally products of a British military semiconductor manufacturer. World class german produced passive components have been selected including extravagant polypropylene capacitors, polystyrene capacitors, and metal film resistors. The casing for the amplifier is precision injection moulded from a "non-magnetic", "non-electroconductive" metal substitute produced by Space Division of American General Electric.
All spurious and harmful stages, such as tone-controls and filters, headphone and loudspeaker switching, protection circuits and balance controls have been eliminated to make the amplifier a "straight-line", no compromise, state-of-the-art. Design. The quality control standards are amongst the highest in the industry where every amplifier is tested along nearly 100 parameters on the most sophisticated hewlett-packard CAD-CAM systems available. The result is an extraordinary achievement called the Cyrus One integrated amplifier, elegant in appearance, without gimmicks, and capable of producing a breathtaking and spectacular sound stage when used with quality ancillary equipment.
Specifications
Power Amp. Section
Continuous Average Power: 
30 watts per channel both driven into 8 Ω
40 watts per channel both driven into 4 Ω
Current Delivery:
10 amps RMS continuous
40 amps peak to peak instantaneous
Damping Factor;  100 (20 Hz - 20 kHz)
Dynamic Headroom:  1,4 dB
Slew Factor:  10 (input filter by-passed)
Distortion
Full Power into 8 Ω 0,004% :  (1 kHz); 0,01% (20 kHz)
Full Power into 4 Ω :  0,005% (1 kHz); 0,015% (20 kHz)
Preamp Section
Input Sensitivity
Phono MC :  0,04 mV
Phono MM :  0,400 mV
Line :  65 mV
Input Overload (1 kHz)
Phono MC :  27 dB
Phono MM :  27 dB
 line ;  Infinite
Maximum Output Level
Tape Out :  11 V RMS
Power Amp :  17 v RMS
Input Impedance
Phono MC :  47 k Ω  +100pF
Phono MM :  47 k Ω +100pF
Line :  14 k Ω
Output Impedance
Tape Out :  10 Ω +2,2 µF
Power Amp :  0,08 Ω
Frequency Response :
Phono (ref. New RIAA) :  20 Hz - 20 kHz ±0,2 dB
Line :  1 Hz - 55 kHz -3 dB points
Total Harmonic Distortion
Phono MC :  0,02%
Phono MM :  0,005%
Line :  0,004%
Distortion (SMPTE IMD)
Phono MC :  0,02%
Phono MM :  0,005%
Line :  0,005%
Signal-to-Noise Ratio (A-weighted at 1 W):
Phono MC :  66 dB
Phono MM :  82 dB
Line :  86 dB
General Section
Dimensions (W x H x D):  215 x 85 x 340 mm
Weight:  4 kg