Mesa/Boogie TA-30 TransAtlantic 2 x 12" Combo Amplifier Features at a Glance:2-channel all-tube combo amplifier2 x 12" configuration4 x EL84 power tubes6 x 12AX7 preamp tubesMulti-Watt channel assignable power amp with Duo-Class and Dyna-Watt technologies provides independent, channel-assignable 15..