The journey continues: I sent the humming amp back in may. Line6 in Germany decided without notice to change the tubes, they checked the amp and returned it. I was surprised that they charged me for this. I went for a testdrive right that evening (... amp still humming like I sent it ...) and just five minutes later the amp started humming louder and louder and ... vaporized. Wow! :mellow:
I returned the amp the next day.
Line6 told me: "The amp has been tested and checked before return. We can fix it again but the amp is not in the two years warranty any longer so it´s not a Line6 problem."
(...)
I assume they checked the amp and switched channel A and B while playing. But when you have a HD500 connected (via L6) the reconfigurable analog components (Class A/Class AB; Pentode/Triode) do change too. I wonder if they checked on this as well and maybe thats exactly why the amp broke down. Or do I have one of these DT50s that explode?