My DRRI is blowing the fuse when powered on after about 2 seconds. I did a search and some trouble-shooting but still need advice. Amp worked fine about 9 months ago but has been off and unplugged from wall outlet since. My testing was performed with the standby switch in standby mode (not ON). I removed the rectifier tube and powered on - fuse does not blow With rectifier tube in removed power tubes and powered on - fuse does not blow Swapped power tubes with original Fender GT 6V6, rectifier tube in, powered on - fuse blows after about 2 seconds I'm wondering if I need new tubes and if so which one(s) or should try some other test? Thanks for any suggestions.