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Posted by 1973shovel on October 24, 2020 at 06:13:10:
I'm not familiar with your phono stage (other than hearing the name), so I did a search. Are you talking about the protective discs in the above picture, or do the tubes actually have Pearl type heatsink coolers on them, as shown in the picture below?
Another possibility is damping rings. I tried some Audioquest sorbothane tube rings on a pair of Telefunken smooth plate 12AX7s years ago. While they were removable, they left a mess, and the rings certainly weren't reusable. Beyond the mess, they didn't make a damn bit of difference. I've never had a problem with microphonic 12AX7s.
A picture would be helpful.