Cronos Magnum II

New to the group, amazing amount of information.  My Rogue Audio Cronos Magnum II is about a year old and it blew a K120 tube about a month or so ago.  No big deal, I ordered some back-ups but today one of them blew again and this time with a certain amount of fury.  The port looks like it was on fire, the tube glow was intense then soft, then intense etc.  Pretty significant pop in the speakers also when I turn it on, even before it warms up.  Anyone ever experience this?

Thanks.