Package of 10. 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 ¼. ⅝" Chassis Hole Size T-3 1/4 Volts... See More