Jensen Capacitors of Denmark offer a audio grade 500Vdc & 550Vdc radial electrolytic capacitors with screw terminal connections, widely used in power supplies for valve amplifiers. Please note that the 550V is no longer porduced, we do have some stocks though. If you are looking to upgrade your current line of power supply then look no further. The values on offer are 47uF to 220uF. Superb reliability.