Want a little cleaner front end and the earlier breakup of the JJ EL844's? This is our Low Output SRV Option Retube Kit for the Orange AD30. It contains a matched quad of JJ EL844's for power (which will drop the overall output a couple decibels), a JJ GZ34 rectifier tube, a 5751 for the input tube and current balanced ECC83S for the phase inverter.