Essentially, the design of PRE III LPX HP valve line pre-amplifier is akin of a power amplifier, which drives line level output instead of driving high load of a speaker. The PRE III LPX HP utilises 6N6P or 5687/E182CC as a driver and a pair of triode connected EL84 is a classic power valves, which were popular in electric guitar amps and most radios in the 50s and 60s and are known for their articulate character.
The LPX HP version of PRE III has a supercharged LPU Phono stage with our range of Signal Output Transformers (OPT) : M6 EI core (STD version), all Copper wound Double C-core Super HiB Signal OPT (Special version) or with partial Silver wound Ultra HiB (Classic version) or as all Silver wound Ultra HiB, limited production Signature version.
LPX Phono Section Features:
- MM Phono Pre-amplifier is suitable for all moving magnet (MM) or moving coil (MC) in combination with a matching SUT
- Classic 2 Gain Stage Pentode Input-RIAA-Triode Output Design
- Based on 2 x EF86 Pentode Valves on the Input and 6N6P/5687 Double Triode on the Output
- Pure Class A, Zero NFB, Single Ended, all Valve Amplification RC Circuit Topology
- Active Series-Resistor-less RIAA Equalization
- 5Y3 Valve Rectified CLC2RC (choke filtered) B+ Power Supply
- 47K Input Impedance
Versions
PRE III LPX HP is available with a following output transformer (OPTs) specifications:
- Standard : SW1X Audio Design™ all Copper wound, orient grain M6 EI Core OPTs
- Special : SW1X Audio Design™ all Copper wound Super HiB DC Core OPTs
- Classic : SW1X Audio Design™ Copper/Silver Windings, Super HiB DC Core OPTs
- Signature : SW1X Audio Design™ Silver/Silver Windings, Super HiB DC Core OPTs
Specifications
Dimensions: Height (mm) 150 x Width (mm) 440 x Depth (mm) 400
Weight (kg): 17 (with LPX Phono, 22kg)
Max Power Consumption (W): 180
Output Noise, Unweighted (mVrms): < 0.5
Note: Due to SW1X Audio Design’s ongoing research and development process, specifications are subject to change without notice
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I was looking for a way to transition my headphone system to a speaker system. My current setup had a headphone amp that could also function as a pre amp.
But that amp did not synergize well with the Sw1x dac 3 and vdt3 streamer of my setup.
However in september I saw the headphone pre amp on the Sw1x website and thought that this was perfect for my needs. After a listening session at my dealer the order was placed.
The pre3 headphone amp brings a dynamic and energetic presentation to the music. But still with the requisite control, grip and prat. All of which results in the music coming alive and making that emotional connection.
The pre 3 headphone amp is also still neutral and has lots of power on tap, so almost all headphones can be used. Up to the listener to decide where to go.
So for the future remains to decide which amp and speakers to add.
