how can I hook a non-naim pre to a naim Nap 250?

do I need a special cord to connect these two? where to get this cord? will it work ? thank you.

Check the Naim Audio website for everything you ever wanted to know about Naim.
Naim pre-amps (powered by an external power supply) can be used w/ non-Naim amps but Naim amps are synergistically designed to be used with Naim pre-amps.

Could you...probably; is it best practice...probably not.