musical fidelity sound?

I love MF sound,but are they using cheap selecter & volume?
My ex MF amp, A1X,A100,A3 had these problem.sound "de de" when turning the selecter (it means bad contact).
And Now, I'm using NuVista M3 , Problem occur again.

Had to post here, currently have a MF TriVista 300, have done many A/B's against Krell 400 xi, modded McCormack, and McIntosh MA6500. Perfect word, at least in my system - laid back. ULTRA laid-back. Absolutely wonderful, IMHO. Krell was engaging, deep, articulate, but not real. Mac was beautiful, smooth, but too boomy, again, not real. MF sounds exactly as the source sounds, at least my Tri-Vista. That's all I can ask.

They have the sound of "obsolescence before next Stereophile Rec Components list comes out" aka KACHING