Precision Matched Pair Vacuum Tubes - 4A Filament 125W for Audio Power Amplifiers Preamplifiers & Guitar Amps, Direct-Heated Cathode(2 pcs)

This precision matched pair of vacuum tubes is engineered to deliver superior performance for audio enthusiasts, professionals, and musicians seeking high-fidelity sound reproduction. Crafted with a focus on consistency and reliability, the tubes are optimized for use in power amplifiers, preamplifiers, and guitar amps, bringing out the best in various audio setups—from home HiFi systems to stage gear.
The tubes feature a direct-heated cathode high triode structure, a design that excels in oscillation and power amplification applications. This configuration ensures efficient signal conversion, producing clear, dynamic audio with minimal distortion. With a 4A filament heating input and 125W anode power dissipation, the tubes deliver stable, consistent operation even during extended use, making them suitable for both long listening sessions and rigorous performance schedules.
One of the key strengths of these vacuum tubes is their precision matching. Each pair is calibrated to identical electrical characteristics, ensuring balanced performance across channels. This matching eliminates discrepancies in sound output, creating a cohesive audio experience whether you’re playing guitar, listening to music, or mixing recordings. The consistency also simplifies setup, as there’s no need for additional calibration to achieve optimal sound.
Built for durability, the tubes boast extreme operating ratings: 1250V anode voltage and 210 mA anode current at maximum signal. These robust specifications allow them to withstand demanding conditions, from high-volume performances to extended amplifier operation, without compromising performance. The sturdy construction resists wear and tear, ensuring long-lasting reliability for both professional and hobbyist use.
Low interelectrode capacitance is another standout feature, with an input capacitance of 6PF and output capacitance of 0.9PF. This minimizes signal loss and interference, preserving the integrity of the audio signal from input to output. The result is clear, distortion-free sound with sharp detail, rich harmonics, and balanced frequency response—ideal for high-fidelity audio reproduction and guitar tone shaping.
The tubes are versatile in their application, applicable to single-ended Class A1 amplifiers and push-pull AB2 class amplifiers. They adapt to various audio setups, whether you’re upgrading a vintage amplifier, building a custom HiFi system, or enhancing a guitar amp’s tone. Their compatibility with different amplifier classes makes them a flexible choice for a wide range of users, from audiophiles chasing pure sound to musicians seeking expressive, responsive tone.
Whether you’re replacing old, mismatched tubes or building a new audio system from scratch, these precision matched vacuum tubes offer a reliable, high-performance solution. They combine technical excellence with practical durability, delivering the consistency and clarity needed for professional-level audio. The matched pair ensures balanced performance, while the robust design and low capacitance work together to unlock the full potential of your amplifiers and preamplifiers.
Suitable for home use, studio setups, and live performances, these vacuum tubes cater to diverse needs. They provide the foundation for rich, immersive audio experiences, whether you’re enjoying a favorite album, recording music, or performing on stage. With their technical specifications and reliable performance, they stand as an essential accessory for anyone passionate about audio.