I have been pretty impressed with my musical design pre amp. I also found John who is Musical Design to be very responsive. Why don't you give him a call or email?
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if you're referring to tube rush, then you might hasve a bad tube...i had an sp-2b and one of the tubes went bad...everytime i turned it on or switched inputs the rush would come at me (sounds like a fading psh! noise). not to mention the noise floor increased because of the bad tube. i would try putting different or new tubes in and see what happens.