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'm with Nsgarch's posts re his actual experiences and the requirements of power tubes, although I've never used Herbies and my power tubes were all common pentodes. No microphonic problems to solve in the first place.
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