Electro-Harmonix EL34EHPL Power Vacuum Tube, Platinum Matched Quad Extremely musical and predictable, with a sound that is rich, smooth, and detailed without being edgy. Found in vintage British amplifiers such as Marshall, Hiwatt, and other famous amps. Also suitable for HiFi. Platinum quad (4 tubes), computer-matched by manufacturer on proprietary equipment 6CA7 equivalent