0.15uF (same as 150nF) 275Vac X2 Rated Capacitor
(Package contains one 0.15uF 275Vac X2 Class capacitor)
This part is suitable for USA / Canada 120V 60Hz models
(UK & Europe 220V / 240V / 50Hz models require a different part)
Note: this is not a genuine Rega spare part