When some tube equipment powers up, it draws quite a lot of power. Is it possible w v. old electrical system, that this is causing power surges, which may be blowing fuses? I am assuming that the CJ tech gave you the proper fuse values...but you never know. Or maybe he just assumed you had the manual that gave you the proper values. I suppose its also possible that someone else put wrong fuse values in and that's why those fuses were blown in the first place...I'm assuming from your OP that you recently acquired the amp and had just put it into service when the problem developed.
