Want a very rich and smooth tone with less grit? This is our Gold Pin Option Retube Kit for the Carr Mercury. It uses two Gold Pin ECC83S's and a Gold Pin ECC81 for the front end. The default power tube is a single JJ E34L. However you can configure this kit to use a JJ EL34II, EL34, KT77, 6CA7, 6L6GC, 5881, KT66, 6550 or KT88 by clicking on the "Customize" button!