Emission LabsEML274 Rectifier Tube

The ultimate rectifier tube that inherits the spirit of Western Electric.

Emission Labs (EML) 274BThe rectifier tube continues the lineage of the legendary Western Electric 274 series as a full-wave rectifier tube. Electrically, it is equivalent to the original historical tube, and by adopting an Octal socket, compatibility with modern amplifier environments is enhanced. This rectifier tube delivers bothhigh-quality sound and stabilityto provide the best performance for tube amplifiers.

Structure that achieves refined sound quality and reduced noise

The EML 274B uses a design where the filaments of two diodes are connected in series, improving operational stability and minimizing the impact on the signal. This structure reducesmechanical hum from the transformerand minimizes noise radiation. As a result, compared to low-impedance rectifier tubes like the 5U4G or semiconductor rectifiers,it offers refined sound with transparency and a sense of dimensionality. Especially noteworthy is the detailed sound even at low volumes, which has been highly praised by audiophiles.

Stable power supply and flexible system compatibility

This unit provides stable power using a C-L-C filter configuration in combination with small capacitors. It can supply a stable current of up to 140mA, and under conditions of lower voltage and current, it also offers the flexibility to use 20uF capacitors instead of the standard 4uF. This allows for detailedpower supply tuningto match your system.

Recommended for those who are particular about sound quality

As highly praised by audio enthusiasts, the EML 274B remarkably reduces noise from the transformer, transforming the sound into a more natural and deep expression. For tube amplifier owners who prioritize sound quality and stability,it is the best choice. (For those needing a 274A, the EML 80 is recommended.)

Filament Ratings

Maximum Rating(Not to be used simultaneously)

Dramatic Improvement in Power Supply Quality

• The first thing I noticed when replacing the rectifier tube with an EML was how remarkably the power supply noise was reduced. Because the ripple noise is well suppressed, the overall S/N ratio of the amplifier improves significantly, and the background quietness becomes remarkably smooth, almost as if it were a completely different world. The sound appearing from the 'silence of darkness' is very pleasant, and the music reaches the ears in a purer form.
  
• The stability of the low frequencies has also greatly improved. With a stable supply of current, the amplifier's response becomes quicker, the low end feels solid and unwavering, and the overall sound gains a sense of power. The dynamics have naturally expanded compared to before, and the energy of the music can be felt more directly.
  

Contribution to Sound Quality and Transparency

• The tone is very neutral, without any unnecessary coloration from the rectifier tube. As a result, it seems to bring out the amplifier’s natural sound appeal just as it is. The characteristics of the amplification tubes and circuitry appear honestly, increasing the “purity” in sound creation.
  
• With reduced noise, the separation of sounds also improves, making the contours of each instrument clear. The soundstage becomes more three-dimensional, the focus becomes precise, and the realism of the playback space is greatly enhanced.
  

High Reliability and Durability

• The rectifier tube is a critical component often referred to as the heart of the amplifier, and EML’s rectifier tubes are highly durable and stable, making them very reliable for long-term use. Simply by having a stable power section, the sense of security for the entire system greatly increases.