Want more warmth and definition? This is our Standard Retube Kit for the VOX AC30HH and AC30H2 Heritage amps. It contains a matched quad of JJ EL84's for power, a JJ GZ34 rectifier tube, an EF806 for V1 along with three ECC83S's one being current balanced for the phase inverter in V4. 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.