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.
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