I recently bought a set of 6550 power tubes that came with tube rings. ARC has long been putting rings on their preamp tubes and there seems to be no question that doing so helps their sound. Has anyone had experience using rings on power tubes? Thanks.
FWIW, I use the herbie's tube dampers on the KT88's in my Cary SLI-80 with no problems. Herbie sells a version specifically for high-heat output tubes.
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