Want a really smooth and rich tone with less grit? This is our Gold Pin Option Retube Kit for the Egnater Tweaker 88 Heads. It contains four Gold Pin ECC83S's one being current balanced for the phase inverter in V4. The default power tubes are a matched pair of JJ KT88's but you can configure this kit to use a matched pair of the 6550's by clicking on the "Customize" button!