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 VOX AC15CC. This kit uses a JJ 5751 for V1 which is in-between an ECC81 and an ECC83S in gain. We follow that up with a balanced ECC83S for V2 and a matched pair of the low output JJ EL844's for the power section.