Want all the Crunch you can get? This is our High Gain Option Retube Kit for the Benson Monarch 15 Combo. It uses a two handpicked High Gain JJ ECC83S's and one JJ ECC832 for the front end, a JJ GZ34 Rectifier and a matched pair of the Double Mica JJ 6V6S's for power. These are a special version of the JJ 6V6S's made exclusively for Eurotubes to greatly decrease tube rattle in combo amps.