Tube dampers?

The Mapleshade Tube Anchors I used on the 12AX7s in my phono stage made it sound so good that I just installed four more (had to be custom-designed) on the 6GK5s in my Conrad Johnson Premier l4. I really like what they do and have had no overheating problems so far. The downside is that they are a bitch to install (a little too tight and you have cracked a tube - ask me how I know). And the thin copper foil grounding straps are no picnic to attach. But the pluses outweigh the minuses and the price is right, plus there is a 30-day moneyback to increase your comfort level.

For 12AX7/12AT7/6DJ8/7308/6922 type tubes, I have had excellent results with the ARC tube dampers.

The Hal-O are the choice!
Happy Listening!

Another vote for the HAL-O. I can't say enough about the dampers and the service provided by Herbie!

Herbies HALO's in my Audible Illusions 3. Can't beat 'em for 10 bucks.