Emission Lab EML300B-XLS Matched Pair

The EML 300B-XLS combines the best of two classic models by adopting the rugged anode structure and larger glass shell of the vintage 52B, while maintaining the classic 300B grid structure and tube curves. This design combines the warmth of the traditional 300B sound with the durability of high output. The result is a premium 300B tube that takes full advantage of the original appeal of vacuum tubes while providing the performance to withstand today's high-end audio.

Features & Advantages

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

Compatible with push-pull amplifiers
Push-pull amplifiers tend to put a load on the vacuum tubes due to their structure, but the 300B-XLS provides stable performance even in such an environment. It stands out for its fine detail even at low volumes, and provides clear and accurate sound even at high volumes. The high output characteristics of the push-pull amplifier are fully brought out, and you can enjoy a sound that combines delicacy and power.

Durability under heavy loads
EML's 300B-XLS maintains stable sound quality even during extended use due to its specially designed filament and grid structure. The grid is gold-plated to provide bias stability and long-term maintenance of pair match. It also meets the demanding requirements 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 treble to bass. It reproduces the subtle nuances of music and creates a clear and rich acoustic space that does not get tired even after listening for a long time.

Use of superior vacuum technology and materials
The EML 300B-XLS is manufactured with high-purity materials and advanced vacuum technology, ensuring durability and stability under thorough quality control. It minimizes the degradation of sound quality and maintains high performance even during long-term use.

Sound Features

The EML 300B-XLS delivers a dynamic representation that is faithful to the original sound while maintaining stable sound quality regardless of volume. It firmly depicts the nuances of delicate sound and provides balanced acoustics from bass to treble. Combined with medium to high efficiency speakers, you can experience a rich sound field and a clear sound spread.

The EML 300B-XLS has the warmth of a classic 300B, but the robust design of the 52B allows for long-lasting and stable listening. As a vacuum tube that provides solid reproduction even at high output, it is an ideal choice for audiophiles.

300B-XLS Bias

The 300B-XLS biases any amplifier, just like the original WE300B.You can use it in two ways depending on your wishes. This section describes these two methods.

1. Any 300B can be replaced with this vacuum 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 vacuum tube, which extracts output power more easily. Especially for amplifiers that can take full advantage of 300B tubes, the EML 300B-XLS is the perfect solution. Amplifiers that try to get as much power as possible out of a regular 300B can benefit from the 300B-XLS. As a result, the sound quality is improved and the lifespan is longer.
2. Another purpose of the EML 300B-XLS is to get more power, as is possible with standard 300B vacuum 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 a lower anode resistance. This is a feature of the 300B-XLS. This improves the attenuation rate of the bass and midrange speakers, resulting in a more natural sound.
3. As an alternative, 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 parts such as filaments, grids and anodes are constructed of cemented carbide for maximum reliability and repeatable quality. 

• Gold-plated lattice.It offers several benefits, including improved bias stability, protection against accidental overload, and improved tube curve linearity.
• Soft Rubber Suspended Tube
• Cemented carbide construction.Hard metal anodes have a more accurate anode distance and do not change shape due to heating or mechanical impact. This ensures the repeatability and long-term stability of the tubing parameters.
• 2 oversized getters
• Hand Blown Glass Bulbs
• Anti-microphonic anode and grid suspension
• These tubes are shipped in high-quality dual boxes.
• Tube printing with real gold (metal), red color is glass baked into glass
• Gold-plated pins, black ceramic socket (white bottom)

EML 300B-XLS Filament Rating