Groove Tubes EL34R Duet, Power Amplifier Duet (2 Tubes)@+Manufactured in Russia, the GR-EL34R has now become almost the standard tube for many of today's British Amps and is in principle a modified copy of the old Mullard tube. The GT-EL34R tube is powerful, offers a straightforward frequency response and has a unique sound with good assertiveness. In distortion mode it is generally quite aggressive and slightly harder. The sound and particular reliability are the main reasons for the wide use of this tube.@+@+, Hard basic sound, Durable, Reliable EL34