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Leben Hi-Fi Stereo Company is a Japanese manufacturer of tube amplification. The designer and owner of Leben is Mr. Taku Hyodo who is ranked as one of the best eight tube audio design engineers in Japan. Mr. Hyodo is highly experienced Hi-Fi engineer having worked for Luxman in the past, and is also a good player of guitar and some different musical instruments (In fact, he once was a professional guitarist). He is also a collector of premium tubes such as 3CSS, 12AT7, E288CC, 6L6GC (5881), all of which are (will be) used in Leben amplifiers at their best capabilities based on Leben's technology. Mr. Hyodo left Luxman and established his own "Kouri Denki Co."(production of electric/electronic components, parts & PCBs) in 1979 when he was 30 years old. Besides producing electronic components and parts, he also has been continuing production of amplifiers under "KFH" brand name mainly for private requirements from Cafe bars, restaurants, etc. The first commercial based product "TRIODE 33"(under "KFH" brand) was released in 1991 with very premium tube 3C33, and a first model under “Leben” brand was a power amplifier RS-35a (with 6L6GC) released in 1995, and then a preamplifier RS-28c (with E288CC) in 1998. (RS-28c was recently renewed as RS-28CX with G.E. 6CG7). My.Hyodo His amplifiers are more of a product of passion, and not many models are produced, however, several people in Japan have actually gathered and set up a fan club called "Leben Audio Lovers’ Club". Members are always waiting for a new model from Leben, which amazes them each time. In light of these circumstances, Mr. Hyodo has started to produce lower-cost amplifiers such as CS-200, CS-250, CS-300, CS-300X to allow more music lovers a possibility to enjoy Leben’s tube sound without investing too much. All of the Leben products are hand made by well trained and experienced people, and are all beautifully finished with high quality components by point to point wiring. All products are still made in Japan, and Leben product’s owners can expect long life and high reliability as well as a highly musical and rewarding performance. All Leben products are based on “Self-biasing circuit”(even by sacrificing the output power on specification) in order to allow users to replace tubes without bias-adjustment and to continue stable operation.

CS300F Integrated Ampifier
cs300f

CS-300F is equipped with GE JAN-6197 which was developped for use in computers and this is the first time it has been used in an audio application For the driver circuit a very high quality tube, a 17EW8 is used, specially produced for Hi-Fi use by a major Japanese electronic manufacturer.
TUBES EQUIPPED JAN-6197 (GE) X 4 17EW8(Hi-Fi) x 2
OUTPUT POWER - Standard 15W X 2
FREQUENCY RESPONSE 15Hz - 100KHz (-2 dB)
DISTORTION 0.7%(10W) INPUT SENSITIVITY 600mV
INPUT IMPEDANCE 100K Ohms.
OUTPUT IMPEDANCE 4/6/8 Ohms (Selectable)
OUTPUT IMPEDANCE(Headphone) 300 Ohms
POWER CONSUMPTION 82W WEIGHT 10.5 Kgs.
DIMENSIONS 360(W) X 270(D) X 140(H) mm

CS300XS Integrated Ampifier
cs300xs

CS-300X(S) is equipped with SOVTEK EL-84 tubes which are well known by audiophiles for its high sound quality against its small size. The high input sensitivity of the EL84 does not require a complicated circuit and accordingly, it can create a low distortion output signal. FIRST-STAGE BY-PASS CONDENSOR: An ultimate audio condensor "OS Condensor" developped by "SANYO" LAST-STAGE BY-PASS CONDENSOR: "Fine-Gold" by "NICHICON" JOINT CONDENSOR: "Metalized Polypropylene Condensor" with "Mesh-Shielding". NF OVERSHOOT PREVENTION CONDENSOR: Ceramic Conderser. CATHODE RESISTOR: 4W type.(Instead of 3W type) OUTPUT TRANSFORMER: Newly developped Transformer with wider range for high frequency. WBT type binding post TUBES EQUIPPED EL84(SOVTEK) X 4 12AX7A(Sovtek) X 2
OUTPUT POWER 15W X 2
FREQUENCY RESPONSE 15Hz - 100KHz (-2 dB)
DISTORTION 0.7%(10W)
INPUT SENSITIVITY 600mV
INPUT IMPEDANCE 100K Ohms
OUTPUT IMPEDANCE 4/6/8 Ohms (Selectable)
POWER CONSUMPTION 82W WEIGHT 10.5 Kgs.
DIMENSIONS 360 (W) X 270 (D) X 140 (H) mm

CS600 Integrated Ampifier
cs600

TWO SELECTIONS OF OUTPUT TUBES: 6L6GC(5881) AND OPTIONAL 6CA7(EL34) TUBES. 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. CS-600 picture No.2 POWER AMPLIFIER DIRECT SWITCH & INPUTS. "PREAMP-IN" terminals on the rear panel allow you to use CS-600 as a power amplifier. By switching a selector on thr front panel, by-pass all the functions only excepting a Volume control. A WIDE RANGE OF SPEAKER APPLICATION Multi output impedance selector: 4/6/8/16 ohms. FLAT AND WIDE FREQUENCY RESPONSE A wide-ranged and flat frequency response upto 100KHz is enough capable for future digital audio format such as SACD/HDCD. CS-600 picture No.3 OTHER FEATURES Twin-triode tube 6CS7 for the first-stage amplification. WBT type speaker terminals. Heavy-duty output transformer for 50W grade amplifiers. Large capacity choke-coil: 5H350mA Dumper tube 6CJ3 (for Colour TV use) is applied to delay a supply of high voltage (B-Voltage) to output tubes in order to protect output tubes from damages and to longer the life. All high-end audio grade electrical components (condensors, resistors) Operation lamp indicator Succeeding a front design of CS-300/CS-300X. 24K Gold-Plated Knobs. Side Wood-Panels. FIVE INPUTS CS-600 IS EQUIPPED WITH 5 LINE INPUTS(RCA unbalanced) PLUS TAPE MONITOR. FULL FUNCTIONS FOR INTEGRATED AMP. Power Amp Direct Switch. (All functions by-pass only excepting Volume control) Muting Switch. Stereo/Reverse Switch. Variable Output Impedance: 4/6/8/16 Ohms. Tape Monitor Switch. Bass Boost Switch. Headphone Output. Speaker/Headphone Selector Switch. Tube Indicator Lamps. Operation Lamp Indicator.
CS-600 SPECIFICATIONS
TUBES EQUIPPED (4) 6L6GC (5881) SOVTEK, (EL34/6CA7 - Option) (4) 6CS7 (1) 6CJ3
OUTPUT POWER 32W x 2 (6L6GC) at 1KHz. 28W x 2 (EL34) at 1KHz.
FREQUENCY RESPONSE 10Hz - 100KHz. (-0.1dB)
DISTORTION 0.7%(10W)
INPUT SENSITIVITY 900mV at 20W
OUTPUT IMPEDANCE 4/6/8/16 Ohms (Selectable)
POWER CONSUMPTION WEIGHT 22.5 Kgs.
DIMENSIONS 450 (W) X 360 (D) X 142 (H) mm 

RS-28CS Preamplifier
rs28cx

INTRODUCTION
There are two major types of RIAA phono equalization systems, one is NFB(Negative Feedback) type and the other is CR type. A representative preamplifier equipped with NFB type equalizer is the MARANTZ Model: 7. This is a 3-step amplification NF equalizer based on 12AX7, which applies NFB from the 3rd stage cathode to the 1st stage cathode.(so-called "K-K type"). The advantage of the NFB type is that it does not require a high gain level and is not very sensitive to tube quality. However, the impedance of NFB at high frequency range becomes very low and results in a negative effect - the sound becomes hard and dry. The NFB type is usually used as it is an easier way to attain a good signal-to-noise ratio. As for the CR type, a masterpiece preamplifier equipped with the CR type equalizer is the vintage Harman-Kardon Model: "Citation IV". RS-28CX picture No.2 CR type equalization requires a high gain level and is much more sensitive to tube quality. Since tube quality will be directly amplified, the finest possible quality tubes are needed for this type of equalizer. Moreover, proper implementation is more difficult. However, the CR type is much more superior sonically to the NFB type, being very stable in the high frequency range and is able to reproduce a very high quality sound especially when high quality tubes are used.
 RS-28CX is equipped with the CR type equalizer based on GE(General Electric/USA) 12AT7 authorized by J.A.N.(Joint Army & Navy) standard of US Army, and can reproduce a very high quality and clear sound without adding any NFB. To avoid compromising on sound quality ,one of the solutions we adapted to totally protect the sensitive CR type equalizer from negative effects was to develop a separate power supply unit. Likewise, some of the finest available high-end audio components were selected for the RS28C to keep the deflection of the RIAA curve below +/-0.3%. Of course, the phono equalizer is only one of the strengths of the RS28C. Another notable feature is a very strong output voltage created by the Dual-Triode Tube 6CG7 of General Electric(USA) used for the line stage. Leben further selected the best quality tubes out of these and constructed a powerful SRPP type amplification which can supply power amplifiers with a maximum 80V of clean output signal. In considering the fact that output voltage of a standard preamplifier is more or less 40V, the RS28C can output about two times as much voltage, which will drive power amplifiers with very low input sensitivity. Likewise, for using the RS28C with a high sensitivity power amplifier, a 5-step attenuator is present in order to eliminate residual noise from speakers. Leben also included two outputs (one fixed and one variable) in order to cope with requirements for adding a Sub-Woofer.
RS-28CX SPECIFICATIONS
TUBE COMPLIMENT 2 x 6CG7 (G.E.) 2 x 12AT7 (G.E.) 1 x 5Y3WGT
PHONO AMPLIFIER Gain 20.2dB RIAA Curve Less than +-0.3dB. Max. Input 400mV (2KHz.)
LINE AMPLIFIER Gain 25.2dB Max. Output 80V (Variable) & 80V(fixed) Output Impedance 580 Ohms Remaining Noise 0.03mV
WEIGHT Main Body 7.0 Kg Power Supply 6.5 Kg
DIMENSIONS Main Body 352(W) x 240(D) x 175(H) mm Power Supply 233(w) x 240(d) x 175(H) mm

Technical Specifications "GENERAL ELECTRIC"(USA) J.A.N. STANDARD TUBE 12AT7 The Phono equalizer Circuit of CS-30EQ is of CR type RIAA equalization design with zero feedback in order to bring out the superior characteristic of the 12AT7 which is authorized by J.A.N.(Joint Army & Navy) standard. "GENERAL ELECTRIC"(USA) HIGH OUTPUT TUBE 6CG7 The line stage circuit uses the Twin-Triode Tube 6CG7 of General Electric(USA) SRPP system, and can supply a signal of up to 80V to the Power Amplifier. Therefore, RS-28CX can drive all kinds of Power Amplifiers of Low-Sensitivity or Low-Driving capability. HIGH-GRADE PARTS The highest quality available components(Condensors, Resisters, etc) are used for all essential parts which affect the sound quality. a high grade Detachable AC power cord is included. RS-28CX with CS-660P picture.
INDEPENDENT POWER SUPPLY UNIT. In order to shut-off any influences from the power transformer to the main circuit,the Power Supply Unit is housed in a seperate chassis.

CS1000P Power Amplifier
CS1000P Power Amplifier

High power output tube KT120(Super KT88) 100W/ch(1KHz) at Pentode circuit (70W/ch at Triode). Pentode/Triode selector switch Bias adjustment with a Cathode-direct meter Several type of output tubes are applicable by adjusting the cathodal electric current. Newly developed Orient-core output transformer A minimum loss and a Superior high-frequency response. CS-1000P picture No.3 Flat and wide Frequency Response A wide frequency response from 10Hz to 150KHz(-0dB) caters for digital audio formats such as SACD/HDCD. High rigidity solid aluminum insulators
OTHER FEATURES
Super-high sensitivity bias meter made by a long-established manufacturer. High-grade Metal glaze resistorals of below 1% error margin.
High-grade 41-steps Detent Volume of ALPS.
 CS-1000P SPECIFICATIONS
TUBES COMPLIMENT KT120 x 4 6922/6DJ8(ECC88) x 2 6CG7/6FQ7 x 2
OUTPUT POWER 100W x 2 at 1KHz.
FREQUENCY RESPONSE 10Hz - 150KHz. (-3dB)
INPUT SENSITIVITY 0.4V at 50W
INPUT IMPEDANCE 100K Ohms.
OUTPUT IMPEDANCE 4/6/8/16 Ohms (Selectable)
POWER CONSUMPTION WEIGHT 23.5 Kgs.
DIMENSIONS 455 (W) X 200 (H) X 335 (D) mm