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"Black base" high-voltage power pentode. Perfect EL34 for vintage equipment and a sure way to improve the performance of modern amps.The new Electro-Harmonix EL34EH tube is extremely musical, with a sound that is rich, smooth, and highly detailed without being edgy. It is the perfect EL34 for vintage equipment and a sure way to improve the performance of modern equipment. According to the technical journal, Vacuum Tube Valley, the "...new EL34-EH tube comes very close to the sonics of a Mullard EL34..." They go on to say, "The Electro-Harmonix tube is balanced throughout the entire music spectrum. Bass goes deep and is tight, mids are sweet and well defined and highs are detailed and extended."