You can read the complete test on the poland site (you can translate on your browse)  CS 600X sur highfidelity.pl 

for those in a hurry, here is its summary:

"""" ...I have not heard such successful audio products in a long time. Leben charms with beautiful timbre - this is just for normal Japanese amplifiers - but also great dynamics, great bass and space, things that we do not associate with the EL34 tube.

It is an extremely functional device, because it is also a high-end headphone amplifier and we can replace it with end lamps. The only thing you do not have is a remote control. Everything else is great! ... """"

Specifications

Valves: 4x EL34 ; 4x 6CS7; 1x 6CJ3

Output Power: 32W x 2 (6L6GC) at 1kHz; 28W x 2 (EL34) at 1kHz

Inputs: 5 line inputs via RCA plus tape monitor

Frequency Response: 10Hz - 100kHz (-0.1dB)

Distortion: 0.7% (10W)

Input Sensitivity: 900mV

Output Impedance: 4 / 6 / 8 / 16 Ohms (Selectable)

Power Supply: 240V / 50Hz

Weight: 22.5 kg (approx)

Dimensions: 45cm x 36cm x 14.2cm (W x D x H - approx. including knobs and terminals)