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SPA V Stereo Power Amplifier

SW1X Audio Design™ SPA V Zenith

Performance Level 3/4/5
300B DHT Power Amplifier

SPA V is a 3 gain stage Stereo Power Amplifier without input switch and volume control. Therefore it is ideally paired with our PRE III or PRE IV Line Pre-amplifier.

The Directly Heated 300B Triodes at the output need no introduction. They are driven either by popular 6J5/6SN7 input/driver tubes or with the powerful 6V6 to produce seemsless linear and balanced sound.

Available in different versions: Standard, Special and the limited Classic or Signature versions with different power output transformer options (M6, SHiB and UHiB) and all Copper or Copper/Silver  windings

SPA V Stereo Power Amplifier Hifi Amplifier for high end systems & record players

SW1X Audio Design™ SPA V Integrated Amplifier Features:

  • Specially Selected and Harmonically Matched Component & Material Quality
  • Single Ended, absolutely Zero NFB, Class A, Directly Heated Triode Valve Power Amplifier
  • 2 x 6J5/6SN7 Triode driver/input Stage Valves driving the 2 x 300B DHT Valves
  • 3 Amplification Gain Stage Design
  • Point 2 Point Hardwiring Technique for the most consistent production results
  • Internally wired exclusively with our SW1X Magnum, Genesis and Opus conductors
  • SW1X Audio DesignCustom Designed (50 Watt) Signal Output Transformers
  • Quasi Mono, Directly Heated Double Diode Valve Rectified B+ Power Supply
  • Orient grain M6 EI core mains Transformers & Chokes
  • Valve rectified Fixed Bias Power Supply

 

Tube Compliment:  2 x 6J5, 2 x 6SN7, 2 x 300B, 1 x 5U4GB, 1 x 5Y3

Reviews

SPA V is avaiable in 4 Versions with either Satin Silver or Matte Black front Panels

with a following output transformer (OPTs) specifications:

  • Standard : SW1X Audio Design all Copper wound, orient grain M6 EI Core OPTs
  • Special :  SW1X Audio Designall Copper wound Super HiB DC Core OPTs
  • Classic : SW1X Audio DesignCopper/Silver Windings, Super HiB DC Core OPTs
  • Signature : SW1X Audio Design™ Silver/Silver Windings, Super HiB DC Core OPTs

 

SW1X Audio Transformers

 

Optional Extras

  • Silver wound SW1X Audio DesignCustom Designed Super HiB or Ultra HiB DC core Signal Output Transformers
  • Fully Hardwired Tube Output Stage on the Bakelite Board
  • Fine Silver wiring on the Input, Bakelite Board and Output
  • AN 2W non-magnetic Niobium resistors on a Hardwired Bakelite Board
  • Super HiB double C-Core mains transformers
  • Inter-stage signal decoupling capacitors: 1. Copper Foil in Oil or 2. Silver Foil capacitors
  • AN 2W silver, non-magnetic, Tantalum resistors

 

 

Specifications

Single Ended, Class A, Zero NFB, Output Power (W): 8, which sound at least like 50 Watts and the dynamic delivery feel like 500 W

when paired with with High Sensitivity Speakers (min 96dB/W/1m is recommended)

Input Sensitivity (V): 1

Input Impedance (Ohms): 47K or 100K

Output Impedance (Ohms): 4 & 8

Max Power Consumption (W): 250

Output Noise, Unweighted (mVrms): < 0.5

Dimensions (without tubes and feet): Height (mm) 250 x Width (mm) 440 x Depth (mm) 400

Weight (kg): 35

 

Note: Due to SW1X Audio Design’s ongoing research and development process, specifications are subject to change without notice

 

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