KR Audio 300BXLS Vacuum Tube
Best high-power upgrade for audiophiles seeking refined vacuum tube performance.
The KR Audio 300BXLS vacuum tube represents a significant advancement in technology, offering a more powerful iteration of the legendary 300B design. These tubes are meticulously crafted to deliver 15-24 watts of pure Class-A power per tube, ensuring ample headroom and dynamic range for the reproduction of intricate musical passages. Engineered for remarkable linearity and low distortion, they create a soundstage that is both transparent and deeply engaging. Each tube undergoes rigorous testing and matching to guarantee optimal performance and longevity.
$1700.00
Owner Satisfaction
4.7
/ 5
Category Rank
421
/ 1719
#421 in Power Amplifiers
Price vs Category Average
-79%
Below average
Maximum Plate Voltage
600
/ V
Who it's for
- Listeners looking to revitalize their existing tube amplifier
- Audiophiles seeking an immersive and natural soundstage
- System builders prioritizing long-term component reliability
Who should skip it
- Budget-conscious buyers seeking affordable audio upgrades
- Novice users uncomfortable with fragile, high-maintenance equipment
- Energy-conscious listeners worried about heat and power consumption
Performance breakdown
Power Output
Delivers significantly more wattage than standard 300B designs for demanding speakers.
Sonic Transparency
Maintains exceptional clarity and detail across complex musical passages.
Build Integrity
Handcrafted construction ensures premium durability and consistent long-term performance.
Dynamic Range
Provides expansive headroom that brings recordings to life with authority.
Soundstage Depth
Creates an immersive, three-dimensional listening environment for the listener.
Matching Precision
Rigorous factory testing guarantees perfectly balanced pairs for optimal channel symmetry.
Key Specs
Maximum Plate Voltage
600 V
Maximum Plate Current
160 mA
Plate Dissipation
70 Watts
Va
450 V
Ia
100 mA
Vg
-94 V
Transconductance
5.7 mA/V
Amplification Factor
3.7
Features
- Groundbreaking low-frequency, high-power triodes
- Redefines the limits of high-end audio performance
- Delivers 15-24 watts of pure Class-A power per tube
- Exceptional headroom and dynamic range for demanding musical passages
- Highly transparent and emotionally engaging sound with vast, immersive soundstage
- Meticulously crafted using the finest materials
- Rigorous testing and matching for optimal performance and reliability
- A more powerful version of the original 300B tube
What customers say
Customers consistently praise the KR Audio 300BXLS Vacuum Tube for its exceptional sound quality and robust build. Enthusiasts frequently highlight the tube's ability to deliver a rich, detailed, and immersive audio experience, often describing it as a significant upgrade to their systems. The perceived quality of construction also receives high marks, contributing to a sense of reliability and longevity. While a premium product, many reviewers feel the sonic improvements and durable design justify the investment, underscoring a strong sense of value for discerning audiophiles seeking top tier performance.
Know before you buy
The 300BXLS is a high-performance evolution of the classic 300B design. It is engineered to handle significantly higher plate dissipation and voltage, allowing it to deliver 15-24 watts of power compared to the lower output typically associated with standard 300B tubes.
Not necessarily. While it shares the same base, the 300BXLS requires an amplifier capable of handling its higher filament current of 1.8A and its specific operating parameters. Always verify that your amplifier's power supply and circuit design are compatible with these higher-spec requirements before installation.
You can expect a more authoritative low-end and increased dynamic headroom. Because these tubes offer higher power output, they provide a more transparent and immersive soundstage, particularly when driving speakers that require more current than a standard 300B can provide.
Vacuum tubes are analog components with inherent manufacturing variances. Rigorous matching ensures that both tubes in your amplifier operate at identical electrical characteristics, which is essential for maintaining a balanced soundstage and consistent performance across both channels.
The tube is designed for a maximum plate voltage of 600V and a plate dissipation of 70 watts. To ensure longevity and safety, your amplifier should be biased correctly according to the tube's specifications, specifically targeting the 450V plate voltage and 100mA plate current.
Still have a question?
Ask Hayley anything about this product before you decide.