The Rolling Stones Mobile was purchased @ auction n England and brought back to the states for restoration about 8-10years ago. I was the tech that spec'd the truck in England and did some repairs and a few gigs w/ it in the NYC area before it was sold off to someone in Canada. The Helios in the truck ran off 48V rails. It had an ingenious switchover unit that would allow it to run off the (2) truck batteries for about 5-6 hrs during power failure. There were (2) M79s which were restored by a tech in Ga. i think. There where also (2) 24trk dolby units normalled to the machines, one of which was missing the control card. Too bad, I found an extra control card in a lot I bought here in NYC. There was also A couple of bel flangers LA-2As DBX 160 VUs and such in it. Who knows what changes had been made over time. The Helios was restored mainly by Ken McKim, currently of Allaire studios, up in Phoenicia NY. I assisted w/ some of the work. technically the truck was a bit of a nightmare by the late 90s. We did a show @ the Tibetan fest @ RFK stadium in DC. the truck had to be towed there as the engine, as previously described, was on its way out. the master feed did sound pretty amazing, however, the output of the trucks AV feed were set to British broadcast level +10 or something. It was blowing out the broadcast trucks inputs whooooooops. there where many good stories over the years regarding the mobile. We added a few new ones before and after it reached US soil.
Jeff DelBello
dB Sound Design