This is a fast acting 3AG 1 AMP fuse. This fuse can serve as a suitable replacement fuse for your vintage amplifier. This item protects your amplifier if the amplifier's current overloads it's limit by making an open circuit immediately.
Time Current Characteristic: Fast Acting Amperage: 1 AMP Voltage Rating: 250V Tube: Ceramic End Caps: Nickel-Plated Brass Operating Temperature: -55 ºC to +125 ºC