I bought my dampers from dampers@levytubes.com, Miami FL. 33155. High Density SILICONE Vacuum Tube Vibration Dampers. Aerospace Silicone-Rated at 400 Degrees F. I run them on all my tubes everywhere. I even bought the little vibration damping dots for under the Mark 3s. I have bought a closely matched set of Holland Amperex that I can try in V2 and V3. I have a long weekend coming up and will do some more swapping around to let you know. I really love this pinch waste tube in V1 Mark, really Lets the Peach sing.
Brian