Emission LabsEML300B-XLS Matched Pair

EML realizes two classical models of "good " by adopting a sturdy anode structure vintage and a large glass shell while maintaining a classical grid structure and vacuum tube curve. This design combines the warmth of traditional 300B sound and durability of high output. As a result, the vacuum tube is a premium 300B vacuum tube that makes full use of its original charm and provides performance that can withstand modern high-end audio.

Features and advantages

Optimal use with single-end amplifiers
EML 300B-XLS can be combined with a single-ended amplifier. The electrical reserve allows for more stable volume reproduction than standard 300B. In particular, medium and low volumes provide a transparent sound and a rich sound field to maintain the original dynamics of recording even at high volumes. Without excessive load on vacuum tubes, the design that combines durability and sound quality promises long life.

Good compatibility with push pull amplifier
In a push-pull amplifier, it is easy to load vacuum tubes structurally, but the 300B-XLS provides stable performance even in such environments. Precise detail is outstanding even at low volume, providing clear and accurate sound even at high volume. It brings out the high power characteristics of the push pull amplifier fully and you can enjoy the sound that combines delicacy and strength.

Durability at high load
The EML 300B-XLS has a specially designed filament and grid structure to maintain stable sound quality even for long periods of time. The grid is gold plated for long-term maintenance of bias stability and pairing. Meet the demanding demands of amplifier designers and audio enthusiasts.

Clear, low distortion sound
EML 300B-XLS provides transparent sound and low distortion, providing a balanced sound quality from high to low. It reproduces the fine nuances of music and creates a clear and rich acoustic space that is hard to get tired even if listening for a long time.

Excellent vacuum technology and material use
EML 300B-XLS is manufactured with high purity materials and advanced vacuum technology, ensuring durability and stability under thorough quality control. Minimize sound quality deterioration and maintain high performance even for long periods of use.

Sound Features

The EML 300B-XLS maintains a stable sound quality regardless of volume, while delivering a true and dynamic expression to the original sound. The nuances of delicate sounds are described firmly, providing balanced acoustics from bass to treble. Combined with medium to high efficiency speakers, you can experience a rich sound field and crisp sound spread.

The EML 300B-XLS has a classic 300B warmth while enabling long, stable listening with a strong 52B design. It is an ideal choice for audio enthusiasts as a vacuum tube that demonstrates robust reproduction even at high power.

300B-XLS bias

300B-XLS biases any amplifier, just like the original WE300B.You can use two ways according to your request. Here we will explain these two methods.

1. It is possible to replace any 300B with this vacuum tube. By simply connecting to the 300B amplifier, the vacuum tube is precisely set to the original 300B operating point. EML 300B-XLS is a very powerful vacuum tube that brings out output power more easily. Especially 300B EML 300B-XLS is the best solution for amplifiers that can make the most of vacuum tubes. Amplifiers that try to get as much power as possible from normal 300B can benefit from 300B-XLS. As a result, the sound quality improves and the life is longer.
2. Another goal of EML 300B-XLS is to obtain more power, as is possible with standard 300B vacuum tubes. This can only be done if the amplifier bias can be adjusted higher. If the anode current of the vacuum tube exceeds the standard 300B specification, the vacuum tube moves to part of the curve with a lower anode resistance. This is a feature of 300B-XLS. This improves the attenuation rate of loudspeakers in the bass and middle tones, resulting in a more natural sound.
3. Alternatively, the entire amplifier can be built around the 300B-XLS. After that, you can select any operating point as shown in the table in this datasheet.

All important components such as filaments, grids and anodes are composed of carbide to achieve the highest reliability and reproducible quality. 

• Gold plated grid.There are several advantages, such as improving bias stability, protecting against accidental overload, and improving tube curve linearity.
• Soft Rubber Suspended Tube
• Ultra hard alloy structure.Hard metal anodes have a more accurate anode distance and do not change shape due to heating or mechanical impact. This ensures the reproducibility and long-term stability of the tube parameters.
• Two oversized getters
• Hand-blown glass ball
• Anti-microphonic anode and grid suspension
• These tubes are shipped with high quality dual boxes.
• Tube printing using real gold (metal), red is glass baked to glass
• Gold plated pin, black ceramic socket (white bottom)

EML 300B-XLS Filament Rating