Want a little cleaner front end and the earlier breakup of the JJ EL844? This is our Low Output SRV Option Retube Kit for the 90's era VOX AC15 Reissue. This kit uses a JJ 5751 for V1 which is in-between an ECC81 and an ECC83S in gain, along with four ECC83S's with one being current balanced for the phase inverter in V5 and a matched pair of the low output JJ EL844's for the power section.