Introducing the UA-101: A True Unipivot Tonearm with
Dynamic Azimuth Control

This project started in 2023 as a tonearm engineering puzzle to figure out how to dynamically calibrate stylus azimuth on the record groove level with correct and stable geometry while the record is playing.

The UA-101 tonearm brings a new engineering perspective to the world of high-fidelity vinyl playback. Rather than relying on piecemeal rules of thumb or decades of compromise, UA-101 is the first tonearm engineered from a single, coherent theoretical framework that connects every critical factor − from stylus-groove interaction to mechanical dynamics and electrical behavior − into one complete acoustic system.

What Makes UA-101 Very Different

For decades, tonearm design has been shaped by isolated practices:

• Stylus contacts groove to decode sound

• Arm mass and resonance charts guide cartridge choice

• Geometry tweaks attempt to reduce tracking error

• Vibration and bearing friction are dealt with ad-hoc

These pieces were never truly unified − until now. The Unified Theory behind the UA-101 synthesizes all key dimensions of tonearm behavior into a rigorous framework that actually predicts and optimizes performance, instead of guessing at it.

A Theory Applied: Comprehensive Design Intelligence

The UA-101’s architecture is grounded in a complete model of the tonearm system:

• Stylus-Groove Mechanics: Real mechanics, not approximations

• Arm Dynamics: Interactions of mass, stiffness, and resonances

• Bearing Precision: ultra low friction, inverted unipivot and damping

• Geometry & Kinematics: From stabilized unipivot design to tracking motion

• Vibration & Structure: Minimized energy transfer and noise

• Electrical Interaction: Cartridge-to-phono stage behavior

This isn’t an incremental improvement − it’s a patented, fundamental redesign.

Why This Matters to Audiophiles

Gone are the days of guesswork alignments and incomplete calibrations. The UA-101 brings:

• Predictable performance based on real engineering models

• Cleaner tracking across every groove radius

• More musical resolution with lower distortion and noise

This tonearm is for the audiophile who wants to hear the actual truth in sound − not just refinements.