Cliff Williams

The sources are from Wikipedia. On the pictures you can see Cliff is using the Music Man Stingray.

I f you scroll to the gear section of this article you can see were it says Cliff uses a Fender Precision Bass

If you scroll to the gear section of this article you can see where it says Cliff uses a Gibson Thunderbird Non-reverse

If you scroll to the gear section of this article you can see where it says Cliff uses a Fender Jazz Bass

If you scroll to the gear section of this page you can see where it says Cliff uses a Gibson EB-3

This image shows Cliff playing a Stingray bass on stage.

In this video from AmpegTV, Cliff talks about his use of the Ampeg brand. In the description of the video Ampeg writes "Bass Frontiers Magazine recently sat down with Ampeg endorser Cliff Williams of AC/DC. Cliff has been a long time supporter of Ampeg and plays an SVT-4PRO with an SVT-810E cabinet.

All the cabs behind the band all seem to be Mesa Boogie cabinets

You can see his bass at 0:32 of the video.

He uses this bass on the whole Flick the Switch album.

[EDIT] HE OWNS THE BASS VERSION NOT THE GUITAR VERSION!!!