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



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



We do not recommend purchasing a key system component without first auditioning it carefully, which is why we have demonstration rooms and a flexible home loan policy.

However in certain situations it can be difficult for people to get to our showroom and for those instances we can offer our mail order service.


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