Introducing the UA-101: A True Unipivot Tonearm
with Dynamic Azimuth Control
In 2023, an ambitious engineering project set out to tackle one of analog audio’s most challenging puzzles: precise azimuth control at the record groove level − while the record is playing.
Unified Theory’s UA-101 is an exciting new tonearm design with dynamic Azimuth Stabilized Playback, a patented, high performance innovation that brings unprecedented precision and stability to vinyl playback. By rethinking conventional unipivot bearing design and azimuth adjustment methods, the UA-101 lets listeners actually hear their stylus come into alignment in real time, greatly simplifying one of the most difficult tonearm adjustments into an easy 45-second process.
UA-101 Wireframe
What makes the UA-101 very different . . .
Precision CNC machining, tungsten and titanium aerospace-grade materials, and an iconic Micro Seiki aesthetic complete the design to celebrate the 50-year anniversary of Micro Seiki's MA-505 universal tonearm that debuted in September 1976. Fully adjustable and supported by clear documentation and customer service, the UA-101 tonearm is engineered to deliver astonishing clarity and overall performance improvements. With dynamic Azimuth Stabilized Playback, vinyl enthusiasts can finally approach azimuth calibration not as a black art, but as an easy final step to hear the full potential of their phono systems.
UA-101 Specifications
Dynamic Azimuth Control Precision Tonearm
Product Contents
Tonearm, Headshell, and Counterweight
3 Auxiliary Counterweights
M27 Base, Washers, Nut (or optional stabilizer)
ASP Oil and Applicator
Phono Cable 5-pin DIN Low Capacitance
Documentation and Mounting Template
Alignment Tools, Jigs, and Alignment Template
Cartridge Installation Screws
Upgrades | Optional Equipment
10-inch and 12-inch arm lengths
Alternative base
Magnesium alloy headshell
Oil bath damping
M27 Stabilizer in brass or stainless steel
Product Specifications
Total length
Effective length
Effective mass
Overhang
Bearing Offset angle
Angle of tracking error
VTA height adjustment range
Suitable cartridge weight
Horizontal movement sensitivity
Vertical movement sensitivity
Tracking force regulation range
Pivot mechanism
Counterweight (decoupled)
Anti-skating mechanism
Arm lifter
Output Connection Type
Headshell type
Headshell weight
Headshell wiring
SRA, zenith, offset angle,
overhang, and azimuth
322 mm
235.75 mm, 9.28 inches
16.3 grams
15.75 mm
22.05°
≤ 1°
6 mm
4 -10 grams
≤ 5 mg
≤ 5 mg
0 - 3 grams
3-axis stabilized unipivot
90 grams variable-mass
Filament torsion
Fluid damped
Low capacitance 5-pin DIN
Multi-axis
9 grams
Direct to cartridge clips
Headshell adjustable
To pre-order the UA-101 tonearm, please click the pre-order button
2026 production order reservations will be limited to 25 tonearms
The UA-101 MSRP is $4,700, US shipping and insurance is included, deposits are $1,000
The estimated delivery date is late summer 2026 and includes a limited 4-year warranty