Want a really smooth and rich tone with less grit? This is our Gold Pin Option Retube kit for the Carr Impala. This kit contains one Gold Pin ECC83S, a Gold Pin 5751 for V3 and two Gold Pin ECC81's. The default power tubes are a matched pair of the JJ 6L6GC’s but you can configure this kit to use the JJ 5881’s by clicking on the "Customize" button.
All that's necessary to check and adjust the bias is a Multimeter. If you don't have one these are available under the "Related Products" tab.