Forget expensive audiophile tube dampers, use red silicon "O" Rings are the best bang for buck to quieten tube microphonics used two spaced per tube.
Choose your size, don’t make them too tight, they "can" dent the glass over time.
https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=silicon+O+rings&_sacat...
Cheers George
Choose your size, don’t make them too tight, they "can" dent the glass over time.
https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=silicon+O+rings&_sacat...
Cheers George