Features: 5881A is a classical power beam quadrupole tube, with stable middle low frequency, clear high frequency, and rich sound. Widely used in guitar amplifiers, and other fields, it can bring a rich musical and expressive sound experience. Quality and rigorous craftsmanship, the internal structure is sturdy, with long-lasting use and good stability. Widely compatible, it can replace classical power transistors such as 6L6GC and 5881 without the need to modify the circuit. Great for replacing and upgrading sound equipment and original guitar amplifier tubes. Specifications: Size: approx. 115×38.5mm/4.52x1.51inch Component: Glass Metal Model: 5881A Electron Tube Scene: Loudspeaker accessories Package Includes: 1 Piece 5881A Electron Tube note: Please allow 1-2cm errors due to manual measurement. Please allow for slight color differences due to different display resolution.