300B-XLS shows its true value with high output
Further enhances the traditional 300B sound and easily reproduces the loudness you need.
Demonstrates true value with high output: EML 300B-XLS matched pair
Emission Labs (EML) 300B-XLSis a premium tube that combines the sonic quality of the classic 300B with the rugged anode construction and large glass shell of the vintage 52B. This "best-of-breed" hybrid design maintains the warmth of the traditional 300B while achieving high output capability and excellent durability.Easily reproduce the loudness you needand provides performance that can withstand modern high-end audio.

Generous electrical reserve and low distortion sound
This machine has a larger electrical reserve than the standard 300B,single-ended amplifierStable volume reproduction is possible. It provides crystal clear sound and a rich sound field at medium and low volumes, and maintains the original dynamics of recordings even at high volumes. Also, it is easy to loadpush pull amplifierHowever, it exhibits stable performance, making full use of its high output characteristics, while delivering clear, low-distortion sound that combines delicacy and power.

Durability to high loads and long life design
EML 300B-XLS maintains stability even during long periods of high-load use due to its specially designed filament and grid structure.gold plated gridensures bias stability and long-term maintenance of pairwise agreement,Cemented carbide constructionensures mechanical and electrical stability. This minimizes deterioration in sound quality,long lifeand promises sustained high performance.

Flexible bias support
The EML 300B-XLS can be used as a direct replacement for standard 300B amplifiers (plug and play). set exactly to the existing operating point, especiallyAn amplifier that tries to extract as much power as possible from a regular 300B.Provides the optimal solution. If you can adjust the amplifier's bias, you can also select an operating point for even higher output, tuning the sound to be more natural, such as improving the attenuation rate in the low-frequency range.

EML 300B-XLS Filament Ratings
| Filament Voltage | = 5 volts (AC or DC) |
|---|---|
| Filament Voltage Tolerance | 4% |
| Filament Current | ~ 1.5 Am |
Overwhelming Drive and Power
- The first thing I was surprised by when replacing with this tube was the strong drive of the amplifier.
While retaining the suppleness of the 300B, there is clearly a feeling that the speakers are moving effortlessly, and even low-efficiency models are driven thoroughly. There is a solid sense of stability in the sound, and the low frequencies remain controlled even in complex tracks, allowing the music to unfold with ease.
- Even at higher volumes, it remains calm, and the depth and scale of dynamics seem enhanced. It is truly an element that 'powerfully supports the music.'
300B-Style Beauty and Clarity
- Increased power does not compromise the characteristic sound of the 300B.
On the contrary, the beauty of the midrange and smooth texture are fully preserved, allowing vocals and string expressions to be felt more richly. Anyone who prefers 300B will instinctively nod in agreement, with its natural luster and pleasantness.
- Because of its high quietness, the moments when sounds emerge are very beautiful. The high S/N ratio translates directly into transparency, reproducing even the finest sounds clearly.
Satisfaction with Quality and Design
- The large glass envelope is truly beautiful. The presence when lit is outstanding, and simply watching it brings satisfaction.









