Emission Labs EML300B-XLS Matched Pair

The EML 300B-XLS is the "best of two worlds" by retaining the classic 300B grid construction and tube curve, but with the rugged anode construction and larger glass shell of a vintage 52B. This design combines the warmth of the traditional 300B sound with the durability of high output support. The result is a premium 300B vacuum tube that offers performance that can withstand modern high-end audio while taking full advantage of the tube's inherent appeal.

Features and Advantages

Optimal use in single-ended amplifiers
The EML 300B-XLS really comes into its own when used with single-ended amplifiers. The generous electrical reserve allows for more stable volume reproduction than standard 300Bs. It provides a crystal-clear sound and rich soundstage, especially at mid and low volumes, and maintains the original dynamics of the recording even at high volumes. The design that does not place excessive load on the vacuum tubes and ensures both durability and sound quality ensures a long life.

Compatibility with push-pull amplifiers
Push-pull amplifiers tend to overload the tubes due to their structure, but the 300B-XLS delivers stable performance even in such environments. The sound is outstandingly detailed even at low volumes, and clear and accurate at high volumes. The high output characteristics of the push-pull amplifier are fully exploited, allowing the user to enjoy a sound that is both delicate and powerful.

Durability under high loads
EML's 300B-XLS maintains stable sound quality over long periods of use thanks to its specially designed filament and grid construction. The grids are gold-plated to ensure bias stability and long-term maintenance of pair matching. They meet the stringent demands of amplifier designers and audiophiles.

Clear, low distortion sound
The EML 300B-XLS delivers crystal clear sound and low distortion, providing balanced sound quality from high to low frequencies. It reproduces the finest nuances of music and creates a clear, rich acoustic space that does not tire even after long hours of listening.

Superior vacuum technology and use of materials
EML 300B-XLS is manufactured using high-purity materials and advanced vacuum technology to ensure durability and stability under thorough quality control. Deterioration of sound quality is minimized and high performance is maintained over long periods of use.

Sound Features

EML 300B-XLS delivers dynamic expression that is faithful to the original sound while maintaining stable sound quality regardless of volume. It delivers well-balanced acoustics from bass to treble, with a strong rendering of the subtle nuances of sound. When combined with medium to high efficiency speakers, you can experience a rich soundstage and crisp sound expansion.

With the warmth of a classic 300B but the robust design of a 52B for long, stable listening, the EML 300B-XLS is the ideal choice for audiophiles as a tube that delivers solid reproduction even at high output.

Bias of 300B-XLS

The 300B-XLS is biased in any amplifier, just like the original WE300B.It can be used in two ways, depending on your needs. These two methods are described here.

1. Any 300B can be replaced with this tube; simply connect it to the 300B amplifier and the tube will be set exactly to the original 300B operating point. the EML 300B-XLS is a very powerful tube and will draw output power more easily. The EML 300B-XLS is the perfect solution, especially for amplifiers that can take full advantage of the 300B vacuum tube. Amplifiers that seek to get as much power as possible from a regular 300B can benefit from the 300B-XLS. The result is improved sound quality and longer life.
2. Another purpose of the EML 300B-XLS is to get more power than is possible with standard 300B tubes. This can only be done if the bias of the amplifier can be adjusted higher. If the anode current of the vacuum tube exceeds the standard 300B specification, the tube will move to the part of the curve with lower anode resistance. This is a feature of the 300B-XLS. This results in a more natural sounding speaker with better attenuation in the low and mid frequencies.
3. Alternatively, the entire amplifier can be built around the 300B-XLS. You can then select any operating point as shown in the table in this data sheet.

All critical components such as filaments, grids, and anodes are constructed of tungsten carbide for maximum reliability and reproducible quality. 

• Gold plated grids.Several advantages include improved bias stability, protection against accidental overloads, and improved linearity of tube curves.
• Soft Rubber Suspended Tubing
• Tungsten carbide construction.Hard metal anodes have a more accurate anode distance and do not change shape due to heating or mechanical shock. This ensures reproducibility and long-term stability of tubing parameters.
• Two oversized getters
• Hand-blown glass sphere
• Anti-microphonic anode and grid suspension
• These tubes are shipped in high quality dual boxes.
• Tubes printed with real gold (metal), red is glass baked into glass
• Gold plated pins, black ceramic sockets (white bottom)

EML 300B-XLS filament rating