The Leben CS-300, an integrated amplifier with 12 watts of
glorious tube power - through the stock 4x Russian Sovtek EL84
valves, well-known for high sound quality. The driver circuit
u tilises two matched GE 5751 valves (a premium version of the
12AX7A) which are stable and very r eliable. Five line inputs
with tape monitor, headphone output, speaker / headphone selector,
v ariable output impedance
(4 / 6 / 8 ohms) make the CS-300
a fully featured integrated amplifier of impeccable performance.
Classic retro look but no difficulties matching SACD's or DVD-A's
standards.
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CS-300X is equipped with English finnest Tube EL-84 produced by
"MULLARD",which is welknown for high sound quality against its
small size.A high input sensitivity of EL84 does not require a
complicated circuit and accordingly, it can create a low distortion
output signal. EL84 is nowadays produced in several countries,
however, we used for CS-300X a premium EL84 of MULLARD(UK) which
increased much a sound quality of CS-300X in spite of a bit evaluation
of a cost of CS-300X.For Driver circuit, we used a Five-Star-Tube
of GENERAL ELECTRIC 5751(premium version of 12AX7A) which has
passed JAN(Joint Army & Navy) standard of U.S. Army and has a
very stable and reliable quality. 
By switching two selectors inside of the cabinet, you can use
either of 6L6GC or 6CA7 (EL34) , and LED indicators on the front
panel will show you which tube is applied. "PREAMP-IN" terminals
on the rear panel allow you to use CS-600 as a power amplifier.
A wide-ranged and flat frequency response upto 100KHz is enough
capable for future digital audio format such as SACD/HDCD.