Want all the gain you can get from your second channel? This is our High Gain Option 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 handpicked High Gain ECC83S's one being current balanced for the phase inverter in V4. 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.