JJ E34L/EL34 Matched Pair Power Vacuum Tubes - Premium Audio Replacement for Guitar Amps & Hi-Fi Systems - Perfect for Marshall, Fender & Vintage Tube Amplifiers

My amp had a major malfunction.and kept blowing fuses so, I pulled the originals out and looked them over and noticed they weren't even physically the same size one of them was !/4 inch longer than the other even though they were both EL34 they also felt crusty and looked dirty. I took them to a place that had a tester and sure enough one tested bad.I found these and ordered right away. They arrived quickly and i installed new fuse and tubes and they worked great! They even made the amp perform better!