I'm not sure where you got your facts for this one. While i was researching tube amps for my car i talked to bk butler himself (if you know tubes, you probably know butler) and he told me that tubes handle vibrations in cars just fine. According to him; tubes were used back in the 'old days' in war planes. I'm guessing if they performed in those conditions; our cars aren't going to destroy them. I've never heard or read about special mounting requirements for a tube amp, maybe there is something i'm missing?