Richard, having a closed mind ( a charge I refute) and the good sense and ability to cut through hot air and cobblers, imaginary differences and belief in unproven theories is entirely different.

The case may effect the sound, if you change the whole thing from steel to wood etc, I have not stated otherwise, but a few screws will not. The effects of the case are due just as much to screening than to any of your theories. RF entering the circuit can be a real pain, indeed it made your Phono 1 utterly useless in my system due to a fantastic ability to relay the converstaions in every passing taxi cab, not to mention the many unwanted radio stations I was introduced to.

My own amps sit in - horror of horrors - heavy steel cases. Many from this BB and PFM have heard them and I've yet to hear any negative comments. Perhaps they were all just being nice  or perhaps any adverse case effects were not important enough to hear.

Many on this board greatly enjoy the TVC magnetic pre amps, which of course use double screened transformers in metal cases. Are they deaf?