These are great amplifiers and a perfect "All rounder" They have power, authority and bass control out of all proportion to the relatively modest rated 100watts per channel. I have had well known solid state 175 watt amplifiers clip at about the same volume as the Cybers.
Not only are they powerful, but they have a delicacy, transparency and natural musicality found in few amplifiers. Vocals are smooth and rich, amongst a huge, open soundstage. These are a top seller, and no wonder.
Perfect for difficult to drive Electrostatic and Ribbon speakers, and anyone wanting sweet, detailed, musical amplifier with a big sound and a real sense of scale and authority.  

Specification:

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CONTROL FUNCTIONS: Power On/Off
POWER OUTPUT: 100 watt x 2, RMS 1kHz ( Ultra-linear )
TOTAL HARMONIC DISTORTION: less than 1%( 50watt, 1kHz )
FREQUENCY RESPONSE: ( -3dB points at 50 watt ) 6Hz-52kHz
INPUT SENSITIVITY: 980mV
INPUT IMPEDANCE: 100k ohms
OUTPUT IMPEDANCE: 4, 8 ohms. ( User selectable )
SIGNAL/NOISE: 90dB
CONSUMPTION: 180watt x 2
INPUT INTERFACES: 1 group ( RCA )
OVERALL NEGATIVE FEEDBACK: Little
VACUUM TUBE: KT150 x 8, 5687x 2, 12AU7 x4
DIMENSIONS: 565 (L) x185 (W) x380(H)mm x 2
WEIGHT: 25kg x 2