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Authorized dealers for SW1x MPA I “Neptune” PP Mono Power Amplifier

  • Audio Gallery — in-store — Las Rozas de Madrid, Comunidad de Madrid, Spain (website)
  • gestalt FINE AUDIO — in-store — Nashville, Tennessee, United States (website)
  • Live Fidelity — in-store — Utrecht, Utrecht, Netherlands (website)
  • Mimic Audio — online and in-store — Chicago, Illinois, United States (website)
  • Perfect sense Audio — in-store — Stockholms län, Sweden (website)
  • Super HiFi by Audiostudio — in-store — Olomoucký kraj, Czech Republic (website)
SW1x MPA I “Neptune” PP Mono Power Amplifier #1
SW1x MPA I “Neptune” PP Mono Power Amplifier variant 1
SW1x MPA I “Neptune” PP Mono Power Amplifier variant 2
SW1x MPA I “Neptune” PP Mono Power Amplifier variant 3
SW1x MPA I “Neptune” PP Mono Power Amplifier variant 4
SW1x MPA I “Neptune” PP Mono Power Amplifier variant 5
SW1x MPA I “Neptune” PP Mono Power Amplifier variant 6
SW1x MPA I “Neptune” PP Mono Power Amplifier variant 7
SW1x MPA I “Neptune” PP Mono Power Amplifier variant 8

SW1x MPA I “Neptune” PP Mono Power Amplifier

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SW1X Audio Design™ MPA I Neptune

Performance Level 2/3

6V6 Valve Push Pull Mono Power Amplifier

MPA I Neptune is a Pure Class A, Zero Negative Feedback, Fully Valve Rectified, Push Pull, 3 Gain Stage, Mono Power Amplifier.


The powerful & grungy character of the triode connected 6V6G output tubes in combination with 6SJ7 and 6SN7 input and driver tubes offer the articulate presentation with a powerful & full bodied sound.


Combined with the finest Materials & Components, MPA I is refined & musical sounding, especially when combined with higher sensitivity speakers.


(91-93dB/W/1m sensitivty is recommended).


SW1X Audio Design™ MPA I Neptune Mono Power Amplifier Features:

  • Specially Selected and Harmonically Matched Component & Material Quality
  • Push Pull, Zero NFB, Class A, Valve Power Amplifier
  • 6SJ7 input Stage, 6SN7 phase inveter tubes driving the triode connected 6V6 Valves
  • Hybrid Point 2 Point Hardwiring Technique for the most consistent production results
  • Internally wired exclusively with SW1X Magnum, Genesis and Opus conductors
  • SW1X Audio Design™ Custom Designed Copper wound (50 Watt Core) Signal Output Transformers
  • Mono, Directly Heated Double Diode Valve Rectified B+ Power Supply
  • Orient grain M6 EI core mains Transformers & Chokes
  • Fixed Bias Power Supply

Tube Compliment: 2 x 6SJ7, 2 x 6SN7, 4 x 6V6G, 2 x 5U4G


MPA I Neptune is avaiable in 2 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

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

Dealers selling SW1x near you

Authorized dealers for SW1x MPA I “Neptune” PP Mono Power Amplifier

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