Electro-Harmonix EL34 Matched Power Tubes Soft Quartet EL34 Matched Power Tubes Soft Quartet The Electro-Harmonix EL34EH is an extremely musical and predictable power tube with a sound that is rich, smooth, and 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 Electro-Harmonix EL34EH 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