Tubes, to damp or not to damp?

Hi,
silicon or rubber is a no for two reasons, the crack over time due to heat and loose their grip and overdamp but are cheap. I found herbies to be a much better solution, they come in different configurations they are nice with the less signature but all of them make tubes sound more or less linear if you like that. If you want to go extreme, damping at certain points the pcb will bring the best results.