Mullard EL34 Power Vacuum Tube, Platinum Matched Quad Faithful reissue of the XF2 Mullard EL34 from the 1960s. Special grid windings which give it a unique sound for both guitar and HiFi Perfect power tube for Dynaco ST-70 or vintage Marshalls, Hiwatt or other British Amps Platinum quad (4 tubes), computer-matched by manufacturer on proprietary equipment 6CA7 equivalent