ER300B

The sound can best be described as agile, muscular and highly detailed. Users of entry-level 300B tubes are in for a shock when they experience the low-frequency tightness and heft of the ER300B, which has dynamics and slam in spades. Midrange reproduction is subtly laid back and organic while retaining an open and expressive quality. It avoids the honeyed vocal tone that some 300B tubes adopt in favour of a more modern and linear sound. 

High frequencies, with a very controlled and extended response. Cymbals are quick, clean and crisp but never harsh or bright. Violins are searing, just as they should sound, and with the right amount of firmness and foundation. 

ELROG’s ER300B is best described as a ‘300B compatible’ vacuum tube. It deviates from the original Western Electric specifications, noticeably in the use of thoriated tungsten for the filament and a maximum plate voltage of 600V. In contrast, the Western Electric datasheet specifies a maximum plate voltage of 450V.