OK First off I feel bad enough so no comments on me please. I got a trade deal on a like new Dual Showman SR/ "The Twin" played great at location I brought it home and stupidly hurried and leaned over the head and plugged into the Ext speaker jack instead of the Main jack. Needless to say after 1 min. of play the amp started breaking up and shut completely down.xxxxx!!!!. Well turned out I burned out the thermo fuse inside the bell of transformer I am not a tech but have worked a little on Ham radio tube amps and know the dangers of high voltage caps. I replaced the fuse and the amp turned right on but the first of the 4- 6l6GC's started red plating and then showed a short on tube tester. The trans did not smell burned or show burned. My question is I am thinking of just getting one tube just to see if the rest of the amp is ok then buy a good matched set I would hate to buy a matched set and burn them up because something else is wrong due to my screwup. Can I leave all tubes out and turn on amp to check voltages out of trans or are there any other ideas out there. Some people like this amp and some don't but it is good for me so I would like to get this thing going. I just don't want to buy a set of tubes and do a hit or miss on $100 worth of tubes. Thanks for any ideas and again please no comments on me and my screwup