As taylor said, a battery eliminator won't come close. If you're gonna power up an amp on the bench I'd suggest a regulated 10 amp 12 volt power supply with current limiting. You won't be able to get it to full power with 10 amps but it'll be enough to turn it on and troubleshoot it.
I think Radio Shack still sells one. Or check the EE lab in school.
Hope you get lucky - the old Rockford amp I fixed for my son only had a blown internal fuse.
1999 Buick Park Ave Ultra
Head Unit: JVC KWHDR720
EQ: Audiocontrol EQL
Front Stage: Hybrid Audio Technologies Imagine 5.25 mids, Morel Maximo tweets
Sub Stage: Boston G3 10", 0.5 cu ft sealed
Amp: PPI Phantom 900.4
Rear Fill: Boston SE953 6X9's