Power Indicator Bulb, Fender
Long life general replacement lamps for dials, indicators, etc. The #47 bulb is the most common replacement light used today. Used on the vast majority of Fender amps and many others as well.
6.3 Volts, 0.15 Amps. Bayonet Base. Bulb: T-3 1/4. 5/8" Chassis Hole