Throught the years they used lots of different amps...
But for the 1972-1988 sound the raw and vintage sound of a Marshall do the job very well... Personnaly I use a Marshall Vintage Modern 50w head, very expensive but very worthy!
I suggest if you have a big professionnal budget:
-Marshall Vintage Modern
And if you got an average buget:
-Peavey Valve King
For the distortion, only the natural one, from their valve amps... NO DISTORTION PEDALS&&& (cause it sucks, I owned 2 and hated the sound)