I never meant to imply that NASA was glitch free. Aborted missions & other disasters more than attest to that. The point that I was making was that too much is made of vibrations. The chopper example certainly attests to that. The point that I was trying to make is that a good deal of audio lore is based on solutions to nonexistant audible issues. Were we talking about tube amps, I'm willing to concede that microphonics & airborne vibrations could cause an issue. One of the factors that ought be figured into the design & subsequent pricing of SS amps is resistance to cat feet & other miniscule vibrations.