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