SW1X SPA V "Zenith"

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

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 Design™ Custom 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

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 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

Optional Extras

• Silver wound SW1X Audio Design™ Custom 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