Six 20mm Inside Diameter Rubber Tube Damping Rings For 12AX7, ECC83, 12AT7, 12DW7, 6DJ8 etc. #RTRX
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Slips right onto the glass bulb of your 9 pin miniature preamp tubes. If you've been having trouble with microphonic 12AX7s etc. you should give these rings a spin in your old amp. I measured 30mm outside diameter, 20mm inside diameter.