I've been blowing power tubes fairly quickly (within 2 months of use). We finally figured out that the retainer clips that hold the tubes in are wearing holes through the glass. Inspecting old sets of power tubes that have come out of this amp revealed the same issue. Has anyone else experinced this? If so, how was it resolved? I have a ticket in and I'm waiting to hear back from Line6 support. I use 6L6 GC MSTR RUBY TUBES.