JJ 6V6S Double Mica Single. These tubes are made solely for Eurotubes by JJ Electronic. These tubes were developed for us to greatly reduce the possibility of "tube rattle" when used in combo amps. All of our "Retube Kits" for combo amps are shipped with the Double Mica tubes at the same price as standard tubes.
Note: There is no benefit to using the Double Mica tubes in anything other than combo amps.