Not a fan of damping tubes as it flattens the sound. Try listening with and without. Probably best not to damp power tubes due to the heat.
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Let me start by saying I am a strong supporter of Herbie’s Audio Lab products. All that I have purchased deliver as promised and without insane pricing. And now, the one related exception. I have not had good success with their small signal tube dampers, having tried them on several occasions with ARC products. They DO seem to somewhat take the life/sparkle out of the tube in use. One hundred percent of the time it’s been back to the tube dampers supplied by ARC. I have not tried them on other preamplifier brands or on output tubes in any amplifier.
agreed. In my experience (I tried Duende Criatura, EAT and several others whose names I forgot) anything that touches the tube around its glass bottle ultimately dulls the sound. Two tweaks that seem to work: Mad Scientist Audio Tube Toppers and putting a 1/4in ball of Bluetack on the top of the tube. YMMV