The PRE IV is a signal output transformer (OPT) de-coupled 6V6 tube output stage based, zero negative feedback (zero NFB global or local), line pre-amplifier design. It is a further development of the PRE III power line stage pre-amplifier. The difference in line stage design to power amps is that our goal is the preservation of the signal integrity while minimizing the output impedance and not really signal amplification and reduction of output impedance. Consequently, PRE IV offers the sound akin of DHT tubes plus has very powerful output to drive any power amp, with output impedance below 10 Ohms.
The sound is mature, large & holographic with scale, authority and dynamic range but above everything very transparent comparable to a great passive volume control. It is a great enhancement to any tube power amplifier, driving a source (DAC or Phono), which has a weaker small signal, indirectly heated tube based output stage.
Available in either double C-core Super HiB transformer version or Pemalloy core version (Special version) and the limited production Signature version on request.
SW1X Audio Design™ PRE IV Line Pre-Amplifier Features:
Fully Hardwired Tube Output Stage on the Bakelite Board
Fine Silver wiring on the Input, Bakelite Board and Output
C78I0776
C78I0781
C78I0788
C78I0791
C78I0793
C78I0796
C78I0800
C78I0809
C78I0812
C78I0815
C78I0823
SHiB double DC-Core mains transformers and chokes
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) 250 x Width (mm) 440 x Depth (mm) 400
Featuring a signal output transformer (OPT) de-coupled 6V6 tube output stage and an uncompromising zero negative feedback (NFB) approach (Zero NFB global or local) the PRE IV delivers an uncoloured, pure musical experience like no other.
Unlike traditional power amplifiers, the PRE IV is meticulously engineered to preserve signal integrity while achieving exceptionally low output impedance. With an output impedance below 10 Ohms, it offers the sonic finesse of directly heated triodes (DHT) combined with a commanding drive capability, effortlessly powering any amplifier
The sound is mature, large & holographic with scale, authority and dynamic range but above everything very transparent comparable to a great passive volume control. It is a great enhancement to any tube power amplifier, driving a source (DAC or Phono), which has a weaker small signal, indirectly heated tube based output stage.
Featuring a signal output transformer (OPT) de-coupled 6V6 tube output stage and an uncompromising zero negative feedback (NFB) approach (Zero NFB global or local) the PRE IV delivers an uncoloured, pure musical experience like no other.
Unlike traditional power amplifiers, the PRE IV is meticulously engineered to preserve signal integrity while achieving exceptionally low output impedance. With an output impedance below 10 Ohms, it offers the sonic finesse of directly heated triodes (DHT) combined with a commanding drive capability, effortlessly powering any amplifier
The sound is mature, large & holographic with scale, authority and dynamic range but above everything very transparent comparable to a great passive volume control. It is a great enhancement to any tube power amplifier, driving a source (DAC or Phono), which has a weaker small signal, indirectly heated tube based output stage.
SW1X Audio Design™ PRE IV Line Pre-Amplifier Features: