The EML RGN2504 is part of Emission Labs mesh plate series of full wave rectifiers. The RGN2504 belongs to the classic series of 4V directly heated rectifiers (RGN2004, 2504, 4004) and represents an excellent combination of voltage handling and current output. The RGN2504 is an obvious partner for medium output 4V power tubes (PX25, or stereo AD1’s), but works just as well with all the medium output DHT’s (2A3, stereo 45’s, etc.).
As with all of the EML mesh plate rectifiers, the RGN2504 is built with many key features.
The first being the oversized 100% mesh anode construction. This provides an extremely low mechanical resonance. The plate area, filament design, and internal geometry are designed to provide the classic/correct RGN2504 dynamic characteristics.

Additionally EML uses a high quality ceramic base which is rubber isolated. This helps to minimizes chassis induced vibration. These features combined with an extreme attention to detail, double getters, etc. make the RGN2504 worthy of your consideration.
Designing tube rectified power supplies is not trivial. All aspects of the voltage source (power transformer) and load must be considered. An exotic and high performance tube such as the EML RGN2504 will reward you with exceptional sonics and durability, when implemented correctly. Additionally, substituting rectifiers in existing circuits is not always straight forward. If you are tube rolling rectifiers it is required that the limiting values of each tube type are respected.
Jac has done an excellent job outlining many of the aspects one should consider when using tube rectifiers, directly on the factory Emission Labs 5U4G page. The data and illustrations on this page provide the framework, or lens, by which all tube rectified power supplies should be viewed. For specific data on the RGN2504 be sure to visit the factory RGN2504 page as well.
If you need technical support regarding any aspect of rectifier tube usage, please reach out to us.
All Emission Labs tubes are inspected and tested in-house before shipment. All EML rectifier tubes are shipped in factory packaging.
EML RGN2504 Short Data:
Filament = 4V (+5/-10%), 2.6A
Limiting Values at 300VAC (Per Plate)
- First/Reservoir cap = 60uF
- DC output Current = 200mA
- 140Ω Raa minimum
Limiting Values at 500VAC (Design Max)
- AC input voltage = 500VRMS (per plate)
- First/Reservoir cap = 50uF
- DC output Current = 120mA
- 240Ω Raa minimum
Eurotubes is an official Emission Labs dealer. All EML tubes purchased through Eurotubes come with an automatic 1-Year (2,000hrs) warranty, and are eligible for the factory registered 5-year warranty.

