tube damper help

I mainly use O-rings bought at the hardware store for peanuts. Try 'em for a while to make sure they don't melt :-)

As with Tvad, I'm not at all sure they do anything much. And yes, I've tried the Herbies versions too.

Okay, no kidding. The black o-rings at the hardware store (take a tube along to get the right size) have never melted on me. Ever. But I use them only on small tubes such as 12AX7s and 6922s and should have said not to try them on power output tubes like El34s, 6550s, KT88s or anything else that runs really hot. My mistake.