Looking to freshen up your tone? This is our OEM Retube Kit for the Benson Monarch 15 Combo Amp. It uses two JJ ECC83S's and one JJ ECC832 for the front end, a 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.