With the JJ El84 you get a combination of both great tone and reliability. This tube is characterized by sparkling highs, good mids, and a solid bottom end. Quality construction and a low failure rate make this tube a terrific choice for any amp requiring EL84 tubes. You are purchasing a matched quad (x4 tubes)
NOTE: If the kit includes more than one POWER TUBE, then they (the power tubes) will be APEX Matched. NOTE: Some tube Acronyms are interchangeable - for instance: 12AX7 is the same thing as ECC83; 12AT7 = ECC81; GZ34 = 5AR4. There are others, but these are the most notable.