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MPA II Morpheus kt66 Mono Power Amplifier Monoblock

SW1X Audio Design™ MPA II Morpheus

Performance Level 1/2/3
KT66 Valve Mono Power Amplifier


Morpheus is a Pure Class A, Zero Negative Feedback, Fully Valve Rectified, Single Ended, 3 Gain Stage, Interstage Transformer coupled, Mono Power Amplifier.

The KT66 Triodes in combination with 6V6 triode connected driver tubes offer the presentation of the famous KT66 electric guitar valves with a grungy & full bodied sound.

The output valves are de-coupled by Interstage Transformers and driven by 6V6 power valves to enhance the sound of the KT66 valves with power of the 6V6.

Combined with the finest Materials & Components, MPA II is refined & musical sounding, especially when combined with high sensitivity speakers

(93dB/W/1m sensitivty as a minimum recommended).


SW1X Audio Design™ MPA II Morpheus Mono Power Amplifier Features:

  • Specially Selected and Harmonically Matched Component & Material Quality
  • Single Ended, absolutely Zero NFB, Class A, Valve Power Amplifier
  • 6V6 Valve Driver/6J5 input Stage driving the triode connected KT66 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 DesignCustom 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 KT66, 2 x 5U4G, 2 x 5Y3


MPA II Morpheus 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 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

Optional Extras

  • Fully Hardwired Tube Output Stage on the Bakelite Board
  • Fine Silver Hardwiring of the Bakelite Board

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



Single Ended, Class A, Zero NFB, Output Power (W): 8, which sound at least like 60 Watts and the dynamic delivery feel like 500 W

when paired with with High Sensitivity Speakers (min 93dB/W/1m is recommended)

Input Sensitivity (V): 1

Input Impedance (Ohms): 47K or 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)

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