There is no such thing as isolation. If you would like to greatly improve the efficiency and there for the sound of any audio or video component then try the Audiopoints or Sistrum products. Fundamentally correct so they will always be keepers.
Preamp Isolation Cones Without Going NUTS
What has been the experience of 'Gonners regarding the best EFFECTIVE vibrational/isolation, cone/footer combination product for use under tube preamps that doesn't cost a fourth the price of the components? Not platforms, but cones, points, tip toes, whatever. Say $100 or so TOPS for a SET.