The PRE III LPX is a pure class A, zero negative feedback (global or local) phono line pre amplifier with a signal output transformer (OPT) de-coupled valve output stage. The LPX version of PRE III has a supercharged LPU Phono stage which is based on classic circuit design used to master vinyl recordings and master tapes.
The PRE III LPX is a pure class A, zero negative feedback (global or local) phono line pre amplifier with a signal output transformer (OPT) de-coupled valve output stage. The LPX version of PRE III has a supercharged LPU Phono stage which is based on classic circuit design used to master vinyl recordings and master tapes.
Essentially, the design of PRE III LPX 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 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 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.
Signal OPT of highest quality not only increases transparency (superior to any kind of capacitors) but also lowers the output impedance of the line pre-amplifier further close to 4 Ohms, capable of driving any load of power amplifier input. The virtually unlimited driving capability of PRE III LPX (as well as the DHT version PRE IV) line pre-amplifier acts as a supercharger to a source (DAC Phono, Tape or Radio).
Altogether, the combination of powerful driver and output tubes & Signal Output Transformer (OPT) results in tonal purity, incredible transparency & the dynamic driving ability, which in turn provides an added dynamic expressiveness as the ability to dig deep into musical presentation.
Signal OPT of highest quality not only increases transparency (superior to any kind of capacitors) but also lowers the output impedance of the line pre-amplifier further close to 4 Ohms, capable of driving any load of power amplifier input. The virtually unlimited driving capability of PRE III LPX (as well as the DHT version PRE IV) line pre-amplifier acts as a supercharger to a source (DAC Phono, Tape or Radio).
Altogether, the combination of powerful driver and output tubes & Signal Output Transformer (OPT) results in tonal purity, incredible transparency & the dynamic driving ability, which in turn provides an added dynamic expressiveness as the ability to dig deep into musical presentation.
SW1X Audio Design™ PRE III LPX Line & Phono Pre-amplifier 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
Tube Compliment
Line Section 2 x EL84, 1 x 6N6P or 5687, 1 x 5U4
Phono Section 2 x EF86, 1 x 6N6P / 5687, 1 x 5Y3
Tube Compliment
Line Section 2 x EL84, 1 x 6N6P or 5687, 1 x 5U4
Phono Section 2 x EF86, 1 x 6N6P / 5687, 1 x 5Y3
Versions
PRE III LPX 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
SW1X Audio Design 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.
SW1X Audio Design 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
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
The PRE III LPX is a pure class A, zero negative feedback (global or local) phono line pre amplifier with a signal output transformer (OPT) de-coupled valve output stage. The LPX version of PRE III has a supercharged LPU Phono stage with our range of signal OPTs: 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. Signal OPT of highest quality not only increases transparency (superior to any kind of capacitors) but also lowers the output impedance of the line pre-amplifier further close to 4 Ohms, capable of driving any load of power amplifier input. The virtually unlimited driving capability of PRE III LPX (as well as the DHT version PRE IV) line pre-amplifier acts as a supercharger to a source (DAC Phono, Tape or Radio).
Essentially, the design of PRE III 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 line pre-amplifier 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. Altogether, the combination of powerful driver and output tubes & Signal Output Transformer (OPT) results in tonal purity, incredible transparency & the dynamic driving ability, which in turn provides an added dynamic expressiveness as the ability to dig deep into musical presentation. In combination with finest materials & component, the sound of the PRE III is transparent, characterised by scale, authority and dynamic bite.
SW1X Audio Design™ PRE III LPX Line & Phono Pre-amplifier 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
Tube Compliment Line Section: 2 x EL84, 1 x 6N6P or 5687, 1 x 5U4
Tube Compliment Phono Section: 2 x EF86, 1 x 6N6P / 5687, 1 x 5Y3
PRE III LPX is available in 4 Versions with 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
C78I2504
C78I2507
C78I2511
C78I2513
C78I2515
C78I2517
2Q9A1830
2Q9A1847
C78I2265
C78I2264
C78I2252
C78I2249
C78I2247
C78I2246
Note: Due to SW1X Audio Design’s ongoing research and development process, specifications are subject to change without notice.
SW1X Audio Design 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.
Specifications
Dimensions: Height (mm) 150 x Width (mm) 440 x Depth (mm) 400
