active circuit thunder 1a ver 2

I am virtually finished the restoration of my westie - all switches replaced bridge buffed sides sanded (can't seem to post pics check a.to.g.music on Facebook) looks fantastic and better than I could have hoped. My only problem is the active circuit. I have replaced battery terminals checked routes checked grounds all the wiring seems spot on but dead as a dodo. I can hear some noise if the active is on and my amp is cranked up on 10. I can only surmise that the card is dead. Are replacements around? Anyone had simaler problems. Any work around?