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STAX UA-3N / UA-3NL Multi-Use Integrated Arm
Introduction:
Unlike cartridges, tonearms should not have an inherent tonal color. However, the fact that sound quality changes when switching tonearms proves that selecting the right tonearm is necessary to ensure the stylus correctly traces the record grooves.
When looking at tonearms worldwide, many have a highly complex appearance. Yet, the fundamental principle of design is that the tonearm’s moving parts should have suitable weight for the cartridge and remain simple in construction. Ignoring this principle in pursuit of overly complex designs leads to compromised performance.
The UA-3N (35 cm model) and UA-3NL (40 cm model) are designed to prioritize “trackability,” which is the core purpose of a tonearm. They deliver integrated-level performance with any cartridge combination.
Arm Design Key Point – Trackability
When observed under a microscope, the grooves of a record appear as continuous curves and valleys, with additional warping or eccentricity that may even be visible to the naked eye. The core challenge of tonearm design lies in determining how accurately the stylus can track these grooves.
Particularly when using high-compliance cartridges with low tracking force, a tonearm with optimal effective mass and extremely sensitive pivot movement is essential. The UA-3N/ML is designed to meet this demanding requirement, providing excellent trackability under these conditions.
Trackability Issues:
1. Effective Mass
The moving parts of the UA-3N/ML (from shell to pipe to bearing) are constructed from a high-rigidity, lightweight alloy. This design not only eliminates harmful resonances that often occur in tonearms but also keeps the effective mass low, ensuring high trackability across various cartridges.
The low-frequency resonance frequency (fo), which depends on the effective mass and the cartridge compliance, ideally falls between approximately 7–12 Hz. If this frequency is too low, it will be adversely affected by record warping or eccentricity; if it is too high, it may cause low-frequency distortion. Experiments show that adding extra weight to the shell, increasing the effective mass, noticeably worsens trackability. This demonstrates the UA-3N/ML’s exceptional performance as a lightweight, high-trackability tonearm.
2. Rotational Sensitivity
The UA-3N/ML operates using a two-point pivot bearing system with a finely polished pivot point, combined with a stabilizer that limits lateral tilt through an outer bearing ring. This unique mechanism provides exceptional responsiveness and shows high sensitivity under 5 mg, including the frictional resistance of ultra-thin lead wires. The quality of rotational sensitivity directly influences the tonearm’s trackability, and in this respect, the UA-3N/ML stands apart from other tonearms worldwide.
Improvements from UA-3 to the Latest Model UA-3N/ML
More than two years have passed since the release of the UA-3, and in that time, ongoing evaluations have been made to improve basic performance, durability, and ease of use. These assessments have resulted in the final model, the UA-3N/ML. Below are the main improvements:
1. Shock-Damping Bearing Structure
The addition of two dampers provides series damping, effectively stabilizing tracking at very low stylus pressures. This feature allows tracking with as little as 0.1 g of stylus pressure, as long as the cartridge itself performs well.
2. Quick Balance with Single-Weight Design
A main weight and a sliding ring weight are used, covering various cartridge weights, to accommodate both domestic and international cartridges of differing weights. (For the older Ortofon SPU-G model, a separately sold sub-weight is required.) This design makes it easy to set both balance and stylus pressure accurately.
3. Durable and Lightweight Tapered Head Shell
The head shell, made from hard material and cold-processed, is reinforced with tapered ribs for greater strength and no risk of torsional resonance. The strength-to-weight ratio of this shell is higher than any other shell, making it ideal.
In addition to these primary upgrades, various improvements have been made, such as enhancing the precision of the arm lift, incorporating noise-resistant lead wires, and rationalizing the shell finger rest for ease of use.
Product Specifications
• Model Type: Interchangeable Pipe, Multi-Use Integrated Type
• Compatible Cartridges: Magnetic and Condenser types; suitable for cartridges weighing 5 g to 19 g
• Pipe: Available for Magnetic and Condenser use (in both stereo and monaural versions)
• Automatic Lateral Balance: Achieved via S-shaped pipe design
• Shell: U-shaped, resonance-free structure
• Stylus Position Adjustment Range: 8 mm
• Balance Weight: Single-weight system
• Stylus Pressure: 3 g with a 0.1 g step per rotation
• Overall Length: 340 mm
• Effective Length: 240 mm
• Overhang: 13 mm
• Bearing Center-to-Turntable Center Distance: 227 mm
• Tracking Error: 0.10° per cm or less
• Lift Mechanism: Oil-damped
• Lead Wire: Noise-resistant; 120 cm length
UA-3NL
• Model Type: Interchangeable Pipe, Multi-Use Integrated Type
• Compatible Cartridges: Magnetic and Condenser types; suitable for cartridges weighing 3 g to 17 g
• Pipe: Available for Magnetic and Condenser use (stereo only)
• Automatic Lateral Balance: Achieved via S-shaped pipe design
• Shell: U-shaped, resonance-free structure
• Stylus Position Adjustment Range: 8 mm
• Balance Weight: Single-weight system
• Stylus Pressure: 2 g with a 0.1 g step per rotation
• Overall Length: 420 mm
• Effective Length: 312 mm
• Overhang: 12 mm
• Bearing Center-to-Turntable Center Distance: 300 mm
• Tracking Error: 0.08° per cm or less
• Lift Mechanism: Oil damped
• Lead Wire: Noise-resistant; 120 cm length
Additional Notes:
• For condenser cartridge models (such as CPS-40 or CP-15V), the pipe needs to be replaced for installation. A head shell is not required.
For the Ortofon SPU-G/T model, which has a weight of 31 g, a separate sub-weight must be added for proper balance.
• For optimal use with the top-grade condenser cartridge CPS-40F, it is recommended to pair the arm with the UA-3N/NL and the POD-10 oscillator/detector. For more information, please request a catalog.
Pricing Information
Magnetic Use:
• UA-3N: 14,000 yen
• UA-3NL: 16,000 yen
For Condenser Use:
• UA-3N: 11,200 yen
• UA-3NL: 13,200 yen
Manufacturer Contact Information
Stax Industries Co., Ltd.
Address: 1-25-5 Zoshigaya, Toshima-ku, Tokyo 171
Phone: (981) -72 27
STAX UA-3N / UA-3NL Multi-Use Integrated Arm
Introduction:
Unlike cartridges, tonearms should not have an inherent tonal color. However, the fact that sound quality changes when switching tonearms proves that selecting the right tonearm is necessary to ensure the stylus correctly traces the record grooves.
When looking at tonearms worldwide, many have a highly complex appearance. Yet, the fundamental principle of design is that the tonearm’s moving parts should have suitable weight for the cartridge and remain simple in construction. Ignoring this principle in pursuit of overly complex designs leads to compromised performance.
The UA-3N (35 cm model) and UA-3NL (40 cm model) are designed to prioritize “trackability,” which is the core purpose of a tonearm. They deliver integrated-level performance with any cartridge combination.
Arm Design Key Point – Trackability
When observed under a microscope, the grooves of a record appear as continuous curves and valleys, with additional warping or eccentricity that may even be visible to the naked eye. The core challenge of tonearm design lies in determining how accurately the stylus can track these grooves.
Particularly when using high-compliance cartridges with low tracking force, a tonearm with optimal effective mass and extremely sensitive pivot movement is essential. The UA-3N/ML is designed to meet this demanding requirement, providing excellent trackability under these conditions.
Trackability Issues:
1. Effective Mass
The moving parts of the UA-3N/ML (from shell to pipe to bearing) are constructed from a high-rigidity, lightweight alloy. This design not only eliminates harmful resonances that often occur in tonearms but also keeps the effective mass low, ensuring high trackability across various cartridges.
The low-frequency resonance frequency (fo), which depends on the effective mass and the cartridge compliance, ideally falls between approximately 7–12 Hz. If this frequency is too low, it will be adversely affected by record warping or eccentricity; if it is too high, it may cause low-frequency distortion. Experiments show that adding extra weight to the shell, increasing the effective mass, noticeably worsens trackability. This demonstrates the UA-3N/ML’s exceptional performance as a lightweight, high-trackability tonearm.
2. Rotational Sensitivity
The UA-3N/ML operates using a two-point pivot bearing system with a finely polished pivot point, combined with a stabilizer that limits lateral tilt through an outer bearing ring. This unique mechanism provides exceptional responsiveness and shows high sensitivity under 5 mg, including the frictional resistance of ultra-thin lead wires. The quality of rotational sensitivity directly influences the tonearm’s trackability, and in this respect, the UA-3N/ML stands apart from other tonearms worldwide.
Improvements from UA-3 to the Latest Model UA-3N/ML
More than two years have passed since the release of the UA-3, and in that time, ongoing evaluations have been made to improve basic performance, durability, and ease of use. These assessments have resulted in the final model, the UA-3N/ML. Below are the main improvements:
1. Shock-Damping Bearing Structure
The addition of two dampers provides series damping, effectively stabilizing tracking at very low stylus pressures. This feature allows tracking with as little as 0.1 g of stylus pressure, as long as the cartridge itself performs well.
2. Quick Balance with Single-Weight Design
A main weight and a sliding ring weight are used, covering various cartridge weights, to accommodate both domestic and international cartridges of differing weights. (For the older Ortofon SPU-G model, a separately sold sub-weight is required.) This design makes it easy to set both balance and stylus pressure accurately.
3. Durable and Lightweight Tapered Head Shell
The head shell, made from hard material and cold-processed, is reinforced with tapered ribs for greater strength and no risk of torsional resonance. The strength-to-weight ratio of this shell is higher than any other shell, making it ideal.
In addition to these primary upgrades, various improvements have been made, such as enhancing the precision of the arm lift, incorporating noise-resistant lead wires, and rationalizing the shell finger rest for ease of use.
Product Specifications
• Model Type: Interchangeable Pipe, Multi-Use Integrated Type
• Compatible Cartridges: Magnetic and Condenser types; suitable for cartridges weighing 5 g to 19 g
• Pipe: Available for Magnetic and Condenser use (in both stereo and monaural versions)
• Automatic Lateral Balance: Achieved via S-shaped pipe design
• Shell: U-shaped, resonance-free structure
• Stylus Position Adjustment Range: 8 mm
• Balance Weight: Single-weight system
• Stylus Pressure: 3 g with a 0.1 g step per rotation
• Overall Length: 340 mm
• Effective Length: 240 mm
• Overhang: 13 mm
• Bearing Center-to-Turntable Center Distance: 227 mm
• Tracking Error: 0.10° per cm or less
• Lift Mechanism: Oil-damped
• Lead Wire: Noise-resistant; 120 cm length
UA-3NL
• Model Type: Interchangeable Pipe, Multi-Use Integrated Type
• Compatible Cartridges: Magnetic and Condenser types; suitable for cartridges weighing 3 g to 17 g
• Pipe: Available for Magnetic and Condenser use (stereo only)
• Automatic Lateral Balance: Achieved via S-shaped pipe design
• Shell: U-shaped, resonance-free structure
• Stylus Position Adjustment Range: 8 mm
• Balance Weight: Single-weight system
• Stylus Pressure: 2 g with a 0.1 g step per rotation
• Overall Length: 420 mm
• Effective Length: 312 mm
• Overhang: 12 mm
• Bearing Center-to-Turntable Center Distance: 300 mm
• Tracking Error: 0.08° per cm or less
• Lift Mechanism: Oil damped
• Lead Wire: Noise-resistant; 120 cm length
Additional Notes:
• For condenser cartridge models (such as CPS-40 or CP-15V), the pipe needs to be replaced for installation. A head shell is not required.
For the Ortofon SPU-G/T model, which has a weight of 31 g, a separate sub-weight must be added for proper balance.
• For optimal use with the top-grade condenser cartridge CPS-40F, it is recommended to pair the arm with the UA-3N/NL and the POD-10 oscillator/detector. For more information, please request a catalog.
Pricing Information
Magnetic Use:
• UA-3N: 14,000 yen
• UA-3NL: 16,000 yen
For Condenser Use:
• UA-3N: 11,200 yen
• UA-3NL: 13,200 yen
Manufacturer Contact Information
Stax Industries Co., Ltd.
Address: 1-25-5 Zoshigaya, Toshima-ku, Tokyo 171
Phone: (981) -72 27
Viele Grüße Christian
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