SW1X LPU I Phono Pre-Amplifier

SW1X Audio Design™ LPU I Performance Level 1 MM Valve Phono Pre-Amplifier


The phono pre-amplfier is based on a classic circuit design used to master vinyl recordings and master tapes It is a two gain stage design consisting of 2 (one for each channel) pentode valves on the input and one double triode valve on the output.

The input stage utilises lush sounding EF86 valves in pentode mode, which are loaded by passive RIAA equalization network (series resistor-less, dynamics preserving), driving the powerful 6N6P or 5687 double triode on the output stage

The power supply is 6X5 or 5Y3 valve rectified and choke filtered

  SW1X Audio Design™ LPU I Features:

  • Specially selected and harmonically matched component & material quality
  • Classic pentode input-RIAA-triode output design
  • Based on 2xE80F/EF86 pentode valves on the input and 6N6P/5687 double triode on the output
  • Pure class A, zero feedback, single ended, twin pentode/double triode operation
  • Paper in Oil decoupling capacitors between the two gain stages and output stage
  • Passive series-resistorless RIAA equalization stage
  • 6X5 or 5Y3 valve rectified CLC (choke filtered) HV power supply
  • The MM phono pre-amplifier is suitable for all moving magnet (MM)  or moving coil (MC) in combination with a matching SUT with max 350mV output
  • 47K input impedance /<1K Ohm output impedance
  • Total gain is approximately 40-46 dB depending on the choice of valves
  • 110/115/230/240V AC mains transformers




Dimensions: Height (mm) 140 x Width (mm) 340 x Depth (mm) 400

Weight (kg): 8.5

Max Power Consumption (W): 12

Output Noise, Unweighted (mVrms): < 0.5

Output Impedance (k Ohms): <1

Tube Compliment:  2 x EF86, 1 x 6N6P or 5687, 1 x 6X5 or 5Y3  

Front panel options: brushed Silver or matte Black



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We do not recommend purchasing a key system component without first auditioning it carefully, which is why we have demonstration rooms and a 14 day trial period 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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