I use a Quad 34/303 combination with my P3ESRs.
After all the bad press by the ' Hi Fi Comics ' ( and I mean the magazines...) it's rather ironic that old Quad amplifiers are now sought after. They can be obtained at reasonable prices, too. I paid just under £100 for the 303 and about £50 for the 34.
Peter Walker would be quietly laughing to himself if he was still alive...