Rock solid valves capable of handling high voltages. With the JJ E34L (EL34) you will have a tube with great results in bass and mid frequencies both for use in amplifiers and in heads of all kinds, especially of British origin. They are sold paired to give your amp the best possible sound and performance. The peculiarity of this model, in addition to its blue color, is that the grid voltage is a little higher than the normal model (-13.5 to -16.5 volts -10 to -13.5 volts) which causes a greater "headroom" ideal for HI-FI tube amps.
Made in Slovakia. Before the vacuum valves are shipped, they are tested with an Orange Valve Tester VT-1000!