211 vacuum tube pursues ultimate transparency and musicality
211 vacuum tubes for energetic yet delicate sound
ELROG ER211 is a German-made 211 vacuum tube that optimizes the transparency and straightness that are the essence of 211 vacuum tubes for modern high-end audio environments. It pushes the music signal forward as it is without exaggerating the sound - called 211.output tubeIt embodies the characteristics possessed by a higher degree of purity.
The ER211 by ELROG is designed with low noise and high reliability in mind, and features clear and clear sound.
Eliminating unnecessary coloring, it naturally depicts the contours of instruments and vocals, the depth of the sound field, and the atmosphere of the performance space. When you first listen to it, you get a calm impression, but within that quietness, there is a high resolution and amount of information condensed.

The bass sinks deeply but never swells out excessively, always remaining in a controlled state. In the midrange, the sound image is stable and the localization is clear. There is good clarity and flexibility in the high range, allowing you to see every detail without any irritation. This is a playback that clearly conveys the structure of the music while taking advantage of the sense of scale unique to the 211 vacuum tube.
ER211 has high immunity with maximum plate voltage of 1250V and maximum plate loss of 75W.
This margin allows for both delicacy in soft sounds and unwavering strength in strong plays, making it possible to stably reproduce not only classical music, jazz, and orchestral music, but also dynamic sound sources. Another big appeal is that it is compatible with existing 211-compatible tube amplifiers. Transparency and visibility can be raised to the next level without compromising the amplifier's design philosophy or sound direction.
Those who are already accustomed to using 211 vacuum tubes will be able to feel the difference naturally.
| filament voltage | 10V |
|---|---|
| filament current | 3.25A |
| amplification factor | 12 |
| mutual conductance | 3.3mS |
| plate resistance | 3600Ω |
| maximum plate voltage | 1250V |
| maximum plate loss | 75W |
The ER211 combines the sense of scale, straightness, and transparency of the 211 vacuum tube in a form suitable for modern high-resolution audio. Because it doesn't emphasize the music, the music itself comes to the fore - that's the essence of this German-made high-end 211 vacuum tube.









