2A3 DHT Valve Mono Power Amplifier MPA IV is a Pure Class A, Zero Negative Feedback, Directly Heated Triode, Fully Valve Rectified, Single Ended, 3 Gain Stage, Interstage Transformer coupled, Mono Power Amplifier. The 2A3 Triodes in combination with 6V6 triode connected driver tubes provide a perfect balance between grunty power delivery & refined sound signature. The output valves are de-coupled by Interstage transformers and driven by 6V6 power valves to enhance the sophisticated sound of the 2A3 triodes with powerful & grungy character of the 6V6. Combined with the finest Materials & Components, MPA IV is refined & musical sounding, especially when combined with high sensitivity speakers
- Category: Mono Power Amplifiers
Description
SW1X Audio Design™ MPA IV “Aurora” Performance Level 3/4/5
2A3 DHT Valve Mono Power Amplifier
MPA IV is a Pure Class A, Zero Negative Feedback, Directly Heated Triode, Fully Valve Rectified, Single Ended, 3 Gain Stage, Interstage Transformer coupled, Mono Power Amplifier.
The 2A3 Triodes in combination with 6V6 triode connected driver tubes provide a perfect balance between grunty power delivery & refined sound signature.
The output valves are de-coupled by Interstage transformers and driven by 6V6 power valves to enhance the sophisticated sound of the 2A3 triodes with powerful & grungy character of the 6V6.
Combined with the finest Materials & Components, MPA IV is refined & musical sounding, especially when combined with high sensitivity speakers
(96dB/W/1m sensitivty is recommended).
SW1X Audio Design™ MPA IV Mono Power Amplifier Features:
- Specially Selected and Harmonically Matched Component & Material Quality
- Single Ended, absolutely Zero NFB, Class A, Directly Heated Triode Valve Power Amplifier
- 6V6 Valve Driver/6J5 input Stage driving the 2A3 DHT Valves
- Interstage Transformer de-coupled, 3 Gain Stage Design
- Hybrid 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 Copper wound Super HiB DC Core (50 Watt) Signal Output Transformers
- 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 6V6, 2 x 2A3, 2 x 5U4G, 2 x 5Y3
MPA IV Aurora is avaiable 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
Optional Extras
- Fully Hardwired Tube Output Stage on the Bakelite Board
- Fine Silver Hardwiring of the Bakelite Board
Specifications
Single Ended, Class A, Zero NFB, Output Power (W): 4, which sound at least like 30 Watts and the dynamic delivery feel like 300 W
when paired with with High Sensitivity Speakers (min 96dB/W/1m is recommended)
Input Sensitivity (V): 1
Input Impedance (Ohms): 100K
Output Impedance (Ohms): 4 & 8
Max Power Consumption (W): 200
Output Noise, Unweighted (mVrms): < 0.5
Dimensions (without tubes and feet): Height (mm) 200 x Width (mm) 250 x Depth (mm) 440
Weight (kg): 46 (pair)
Note: Due to SW1X Audio Design’s ongoing research and development process, specifications are subject to change without notice
