A friend brought me a Carvin Pro Bass II that had been sitting in storage for a long time. The fuse blows on power switch "on". I changed the large filter caps just to start with but the problem persists. This will be difficult to troubleshoot without a schematic. The problem is clearly in the power section, as I disconnected every lead going away from it and it still blows the fuse. The transformer is OK as it retains the AC voltage when it is disconnected from the power section. So, if anyone has a lead about where to get a schematic, I would be grateful.