I just got a new Bruno Cow Tipper 100 on a trade here. Fantasic amp..........it came with Plilips 7581A Military Spec Tubes. 1 got broken in transit. These are kind of expensive. Matched sets are about $90. I see some really nice matched quads of JJ's, Grove Tubes coke bottles) and Electro Harmonix from $50-80. Right now I just stuck some old dusty 6L6 I robbed out of my maggie just to make the Bruno work. It sounds fantasic........mismatched Tube and all. Is it worth it to buy these Military spec tubes!? Should I just buy a new matched quad and throw the Philips in my Maggie and keep a spare!? What should I do before I waste Hard earned ca$h? Any and all comments welcome................thanks ahead of time!!