Leben RS-28CX Preamplifier

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The Leben RS-28CX Full Function Preamplier with MM Phono is equipped with a CR-type equalizer based on the General Electric (USA) 12AT7 tube, authorized by the J.A.N. (Joint Army & Navy) standard of the US Army. This allows the unit to reproduce very high-quality and clear sound without adding any negative feedback (NFB).

To avoid compromising sound quality, Leben developed a separate power supply unit to protect the sensitive CR-type equalizer from negative effects. Additionally, they selected some of the finest available high-end audio components for the RS-28CX to maintain the deflection of the RIAA curve below +/-0.3%.

Of course, the phono equalizer is only one of the strengths of the RS-28CX. Another notable feature is the very strong output voltage created by the Dual-Triode Tube 6CG7 from General Electric (USA), equipped for the line stage. Leben further selected the highest quality tubes and constructed a powerful SRPP-type amplification, which can supply power amplifiers with a maximum of 80V of clean output signal. Considering that the output voltage of a standard preamplifier is around 40V, the RS-28CX can output about twice as much voltage, making it ideal for driving power amplifiers with very low input sensitivity.

Additionally, for high sensitivity power amplifiers, a 5-step attenuator is included to eliminate residual noise from speakers.

Leben also included two outputs (one fixed and one variable) to accommodate the addition of a subwoofer.


  • Tube Compliment: 2 x 6CG7 (G.E.), 2 x 12AT7 (G.E.), 1 x 5Y3WGT


  • Gain: 20.2dB
  • RIAA Curve: Less than +-0.3dB.
  • Max. Input: 400mV (2KHz.)


  • Gain: 25.2dB
  • Max. Output: 80V (Variable) & 80V(fixed)
  • Output Impedance: 580 Ohms
  • Remaining Noise: 0.03mV


  • Main Body: 7.0 Kg
  • Power Supply: 6.5 Kg


  • Main Body: 352(W) x 240(D) x 175(H) mm
  • Power Supply: 233(w) x 240(d) x 175(H) mm
  • Attachment: AC Power Cable, Power Supply Connecting Cable.

Other Features:

  • Muting 30 minutes after Power-On
  • Natural wood Side Panels.
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