I installed a new set of matched KT88s not too long ago on my Rogues (couple of months and maybe 350 hours or so ago)... I've had a tube blow and one other on same mono amp stating to blacken on its top.. What might cause this so pre maturely?
Power tubes do short out on occasions - some brands are more prone to this than others. You are fortunate if all you got was a blown tube....in some amps you will take out a bias resistor and/or a fuse. The only way to avoid tubes shorting out is buying tubes generally noted for being rugged in the first place.
As suggested above you could be running your tubes too hot. Are you using the manufacturers recommendations?
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