The best are not at all. I've tried those thing 10 times AT least. Buddies bring them over and it just KILLS the valve. For ME..
We used every material we could think of from BR, silicone, teflon backed, a silicone bead. I went through every O-Ring box on 5 service trucks, Thousands of O-Rings from different manufactures.
Big ZERO for me..
I use a lot of Telefunken small valves It just kills that valve. Where I use a Mullard type valve same thing.. NO dampeners..
They aren't getting close to the power valves, 6V6, 6L6, EL34s, 6550s or KT88. It's like taking a shower with a rain coat on..
Regards
We used every material we could think of from BR, silicone, teflon backed, a silicone bead. I went through every O-Ring box on 5 service trucks, Thousands of O-Rings from different manufactures.
Big ZERO for me..
I use a lot of Telefunken small valves It just kills that valve. Where I use a Mullard type valve same thing.. NO dampeners..
They aren't getting close to the power valves, 6V6, 6L6, EL34s, 6550s or KT88. It's like taking a shower with a rain coat on..
Regards