Great workhorse, 15 watt Single Ended Class A head, can use any octal based power tube (6V6, 6L6, EL34, 6550, KT66, KT88) without re-biasing, currently fitted with an EL34, the 2 preamp tubes can be any combination of 12AX7, 12AT7, 12AU7, 12AY7 OR 12AZ7, built in Hot Plate attenuator allows you...