Looking for more warmth and definition? This is the standard Retube Kit for the Vox Night Train. It contains a matched pair of JJ EL84's for power and two ECC83S's. A nice upgrade from the stock tubes, sweet and warm! Just let us know in the comments section if you're looking for an early breakup, a moderate breakup or a later breakup for more headroom in which case we will choose the coolest grades we have available for the power tubes.