Do you like FAT mids and some extra high end sparkle? This is our ECC803S V1 Option Retube Kit for the Mesa Transatlantic 15 Amps. It uses a Long Plate ECC803S for V1 along with three ECC83S's with one being current balanced for the phase inverter in V4. The default power tubes are a matched pair of the JJ EL84's but you can configure this kit to use the JJ EL844's to drop the power output a couple decibels by clicking on the "Customize" button!