EL34EH Output Tube - Electro-Harmonix - Early Mullard Style. Extremely Musical and Predictable With A Sound That is Rich, Smooth, and Detailed Perfect EL34 for Vintage Equipment. A Sure Way to Improve the Performance of Modern Equipment. "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." - Technical Journal, Vacuum Tube Valley,