J. I. Agnew

Engineering Consultant

J. I. Agnew is a Greek-American engineering consultant, specializing in high-end audio electronics and precision mechanical engineering, as applied to analog recording and reproducing equipment.

He is an internationally recognized authority in the field of analog sound recording and mastering, regularly restoring, repairing and modifying vintage disk recording lathes and tape machines, designing and manufacturing new parts for them, designing and constructing custom equipment for professional audio facilities, while also engineering fully analog recordings and cutting master disks for vinyl record manufacturing.
Furthermore, he is actively involved in research and development projects, designing and prototyping high performance electronic circuits and precision mechanical assemblies on behalf of various concerns worldwide.

J. I. Agnew was educated in Greece and England, was awarded a scholarship for his doctoral research at the University of Sheffield and spent a few years teaching at the same institution. He has frequently presented his work in conferences, seminars and workshops in several countries around the world.

In 2014, along with his wife, Sabine, he founded Magnetic Fidelity, a world-class mastering facility with a focus on analog media. Their life and work became the subject of a full-length documentary film, directed in 2017 by Elina Verykiou and Vasilia Koutsiana, titled "Magnetic Fidelity: A Love Story", screened in various international film festivals and broadcast on national television in Greece.

He is a full member of the Audio Engineering Society, the American Society for Mechanical Engineering, the Institute for Electrical and Electronics Engineering, the American Society for Precision Engineering and the Tube Collectors Association.


Key Skills:

Electronics & Electrical Engineering

  • High Performance Circuit Design and Prototyping
  • Vacuum Tube Electronics
  • Precision Transducer Design
  • Transformer and Inductor Design
  • Measurement and Calibration
  • Vacuum Tube Testing and Matching
  • Custom Equipment Design
  • Laboratory Instruments
  • Audio-Grade Electrical Installations
  • Off-Grid Power and Renewables
  • Control and Automation Systems
  • Communication Systems
  • Restoration and Repair of rare undocumented electronic equipment

Mechanical Engineering
  • Micromachining
  • Precision Machine Tool Design, Restoration and Operation
  • Transport System Design for Audio Equipment
  • Mechanical Measurement Instrument Design, Calibration and Operation
  • Precision Metrology
  • Precision Mechanical Assembly Design
  • Precision Bearing System Design
  • Structural Welding
  • Design for Manufacturability with Geometric Dimensioning and Tolerancing
  • Coil Winding Equipment Design and Operation
  • Restoration, Adjustment and Repair of rare undocumented mechanical equipment

Audio Engineering

  • Analog Disk Recording and Mastering Systems
  • Analog Tape Recording and Mastering Systems
  • Tape Duplication Systems
  • Tape Editing
  • Vinyl Record Manufacturing
  • CD/DVD Manufacturing
  • Acoustics
  • Studio Design
  • Custom Audio Equipment
  • Full Range Monitoring Systems
  • Audiophile Listening Rooms and System Design
  • Testing, Calibration and Measurements
  • Audio Transducer Design
  • Electronic Musical Instruments


  • Microscopes
  • Optical Measurement Instruments
  • Photographic Equipment

Industrial Equipment

  • Air Compressors, Vacuum Pumps and Pneumatic Installations
  • Hydraulic Systems

Automotive Technology
  • Internal Combustion Engine Overhaul Procedures
  • Classic Vehicle Restoration
  • Automotive Electrical System Design
  • International Driving Experience, Overland Travel

Information Technology
  • UNIX, BSD and GNU/Linux Operating Systems
  • C/C++, Python, Shell Scrips, BASIC, HTML/CSS, SQL
  • Max/MSP & Pure Data
  • Internet Radio Broadcasting
  • TeX Typesetting
  • Vintage 8-bit Computers

Language Skills

  • English (Native, Cambridge Proficiency Certification)
  • Greek (Fluent)
  • German (Basic)
  • Serbocroatian (Basic)

Other Skills
  • Technical Writing, Reports and Documentation
  • Classical Music Education (Guitar & Piano)
  • Organic Gardening
  • Gourmet Cooking