I have tube socks, top hats, and tube rings. They all work, but the top hats are the best. Also the most expensive. Hard to tell the difference between the socks and the rings. The rings are by far the most cost effective. But hey! This is high-end audio. Who cares about money! I just ordered some of the brass tube dampers from Andy at Vintage for my 6SN7s. Hope they work as good as the top hats for octal tubes.