Reddit reviews Eurotubes “EuroDamper” Tube Damper Rings for Dual Triode Preamp Tubes and EL84 Power Tubes. Set of 4.
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Custom made from special soft durometer hi-temp siliconeThese will reduce or eliminate tube rattle in most all combo ampsFor all 12AX7, 12AT7, 12AU7, 12BH7 Pre’s and EL84 power tubesLargest and most effective vacuum tube dampers made
My amp does the same thing, pretty common. Instead of messing around w/ the sockets (dat aint it), hit the note to get the rattle sound. You can use a looper to make this easier. Then use a washcloth (they're hot!) and apply slight pressure to each tube to see which one is ringing the worst and verify which tubes it rings on. Now that you know which tubes are ringing/rattling, you can order the number of tube dampers you want from Amazon!
https://www.amazon.com/Eurotubes-EuroDamper-Damper-Triode-Preamp/dp/B019P7KA1C
They're a lil pricey for what they are but they work to eliminated about 75% of the noise. I'm cheap, so I ghetto-rigged something similar involving toothpicks and rubber bands lol. I'd recommend a damper though :) dont be like me