Want a bit more gain? This is our High Gain Option Retube Kit for the Benson Nathan Jr Combo Amp. It uses one Handpicked High Gain ECC83S and one ECC832 for the front end, along with a single Double Mica JJ 6V6S for power. These are a special version of the JJ 6V6S's made exclusively for Eurotubes to greatly decrease tube rattle in combo amps.