Rubber ring for retainer CE-S-H143 fits KT88 and 6550 tubes. Dampens vibration.
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I have an ampeg SVT-CL. I recently retubed the entire amp. The 6 power tubes at the back are held in with these metal retainers that can damage your precious and expensive tubes. Put these bad boys on top of the tube between the tube and your metal retainer. Turn that baby on and know you’ve helped protect your investment.