Fuses protect equipment from disasters like lightning, voltage surges, and internally faulty components. They are inexpensive safeguards from potentially expensive damages. Therefore it is important to buy the best quality. These fuses are made by Bussman, the most respected fuse manufacturer in the world. Feel confident in knowing your equipment is well protected. Most fuse types used in electronic equipment were originally developed for use in automobiles. The letters ‘"AG"’ (example 3AG) used in describing a fuse's physical size originally stood for ‘automotive glass’. The 3AG size (1-1/4" x 1/4") is the most commonly used fuse in tube audio electronics today.

Fast acting fuses open almost immediatly when exposed to over current conditions. These are well suited as protection within an amp between power supplies and individual amp and preamp sections.

Slow Blow or time delay fuses open after a few seconds of over current conditions. These are well suited as the AC fuse first line of defense as they allow initial power-up in rush current flow without opening. Yet these still open quickly when exposed to over current from within the equipment.

The standard large AGC and MDL sizes are for most vintage and reissue amps. The smaller 5mm X 20mm GMA sizes are for newer European amps.