Want more warmth and definition? This is our Standard Retube Kit for the Bogner Alchemist Heads and Combo Amps. It contains five ECC83S's with one being current balanced for the phase inverter in V5. 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.