Review from Hi-Fi+   PDF


From 6Mooms.com

  The new Cyber222 is an improved SRPP design separated with a large, fully-regulated power supply and is hand-assembled to the same critical standards as other opera audio products.  component improvements include higher-quality resistors, new Auricap coupling capacitors and our latest selected 6SN7 twin triode vacuum tubes. remote control system and incorporates extensive internal chassis damping  The cumulative sonic gains are exciting: tighter focus of instruments, more natural-sounding, improved dynamics and better bass control and impact.

Remote Control Functions: Volume up/down, mute, input select, 
RC5 CD controls
Inputs: 5 pairs RCA, Outputs: 2 pairs RCA 

SPECIFICATION:
Frequency response: 2Hz-150KHz(-1B)
Signal-to-noise ratio: 90dB
Distortion: Less than 0.05%(70Hz/7KHz 4:1)
Consumption: 40W
Output terminals:2X Gold plated phono/RCA.
Vacuum tube:6SN7x4 5AR4x1
Remote Control: RC-5 compatible IR system 36KHz modulation
Dimensions: 8cm x 43cm x32cm (HxWxD)
Weight:15Kg

Reviewed in Hi-Fi+ issue 69 [Nov'09]

Link to the review in "The Absolute Sound" collection of the best Pre-Power combinations.



 
The R50MKII is a 20dB gain line stage pre-amplifier using an improved SRPP circuit with no global negative feedback. 
The capacitors used for signal coupling are the exotic US AuriCap's. All connections are point to point wiring using high purity copper hook up wire. The circuit board acts as a support frame for the tubes and other components and actual point to point wirings are done beneath the circuit board.
  The power transformer and choke are shielded from the circuit board. A special silicon steel EI type power transformer and choke with good high frequency response is used together with large Solen MKP metallized polypropylene filtering capacitor.
The two tubes used in the main circuit are the fabulous sounding ECC82/12AU7. In order to match with tube power amps, the R50MKII has been redesigned based on the top model R1.1, to use components that have very little colored sound of their own, so that the R50MKII can clearly show off the sound of the tube power amp itself. A lot of satisfaction will then be achieved by trying out other exotic 12AU7 tubes like the Telefunken and Mullard.

Specification:
Control Functions: Volume left / right, Input Select,[All operational from supplied remote control] Power On/Off
 Harmonic Distortion (for 2V RMS at output): 0.05%(70Hz-7kHz 4:1)
Frequency Response: (at -1dB) 3Hz-150kHz
Input Impedance: 100k ohms
Input Interfaces: 4 groups (RCA)
Output Interfaces: 2 groups (RCA)
Signal/Noise: 90dB
Gain at 1kHz: 20dB
Consumption: 40watt
Negative Feedback: None
Vacuum Tube: 12AU7 x 2 EZ80x1
Dimensions: 440(L) x 320(W) x 120(H) mm
Weight: 12kg

Review from 6moons.com

Reference 1.3 is a passive preamplifier, offering a material improvement over all previous such schemes based around resistive attenuation. high performance core component for a magnetic volume control. It is a multi tapped transformer with a 20 position switch, the transformer is housed in a Mu-metal shielding can measuring 60.25mm in diameter x 72mm in height,     
TECHNICAL SPECIFICATION
CONTROL FUNCTIONS:
Gain, Input Select, Volume, Grounding
HARMONIC DISTORMS (for 2V RMS at output): 0.005%(10Hz~100kHz)
FREQUENCY RESPONSE: (at -1dB) 10Hz-73kHz (0dB), 10Hz-65kHz(6dB)
INPUT INTERFACES: 3 X RCA), 1 X XLR
OUTPUT INTERFACES: 1 X RCA), 1 X XLR
GAIN at 1kHz: 0dB and +6dB switchable
ATTENUATION: -52dB
DIMENSIONS: 430(L) x 160(W) x 100(H) mm
WEIGHT: 10kg

Inside pic showing all-silver wiring