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Pre I Line Pre-Amp

SW1X Audio Design™ PRE I

Performance Level 1
Line Pre-Amplifier


The PRE I is a pure class A, Output Transfomerless (OTL) line pre-amplifier with Power Valve Output Stage. Employing El84 power tubes at the output makes the PRE I a smaller brother to the SW1X PRE II Pre-amplifier. It is great enhancement to any tube power amplifier and ideal partner to our DAC I and II STD/SPX and LPU I Phono products, reducing their output impedance further and enhancing their sound with fullness and authority. With a help of of a PRE I, any source becomes unleashed to drive subsequent power amplifiers to its full potential.

The PRE I can be ordered with differnt series of SW1X Stepped Attenutator Volume Contols.

SW1X Audio Design™ PRE I Line Pre-amplifier Features:

  • Harmonically matched Component & Material Quality
  • Output Transfomerless (OTL) EL84 Power Valve Output Stage
  • 1 x Double triode 6N6P driver, 2 x EL84 Triode Connected Power Valve Amplificaton Design
  • Hybrid Point 2 Point Hardwiring Technique for the most consistent production results
  • 5Y3 Directly heated Tube rectified CLC (choke filtered) B+ power supply
  • For maximum transparency & dynamics, the circuit is hard wired with of a specially selected conductors (single strand or Litz)
  • Internally wired exclusively with our SW1X Magnum, Genesis and Opus conductors
  • 1 x SW1X Audio Design™ Stereo, 24 Way, discrete resistor Stepped Attenuator (optional in SPX Version)


Tube Compliment:  2 x EL84, 1 x 6N6P, 1 x 5Y3


PRE I SPX Line Pre-Amplifier


SW1X Audio products were designed for maximum performance and also to ensure compatibility with majority of audio systems. However, pairing different audio systems may result in impedence or sensitivity mismatch. For maximum musical pleasure, we recommend to pair our products only with our harmonically matched system components. To achieve best possible results, the matching system component should be on equal performance level or alternatively within one level below or above.

Note: Due to SW1X Audio Design’s ongoing research and development process, specifications are subject to change without notice.


Dimensions: Height (mm) 150 x Width (mm) 330 x Depth (mm) 400

Weight (kg): 10 (with LPX Phono, 12kg)

Max Power Consumption (W): 110

Output Noise, Unweighted (mVrms): < 0.5

Output Impedance (Ohms): 10


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