The JJ 6V6 is one of the most solid performing, high-quality, 6V6 tubes available. They are suitable for just about any style of music whether it be rock, blues, jazz, or metal. May be used in any applications calling for 6V6 power 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.