Six 30mm Inside Diameter Rubber Tube Damping Ring For Antique Triodes, Pentodes, #RR30

Six 30mm Inside Diameter Rubber Tube Damping Ring For Antique Triodes, Pentodes, #RR30

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Slips right onto the glass bulb of your 'antique' triode or pentode preamp tubes. Some of you who have been having trouble with microphonic tubes have asked us for a larger ring like this so here it is. I measured 30mm inside diameter, 40.17mm outside diameter.