TH30 is a quartet of EL84 output valves and is rated at 30 Watts Class A. There is also the addition of a valve driven effects loop. Controls: - DIRTY CHANNEL - Volume, Shape, Gain. - CLEAN CHANNEL - Treble, Bass, Volume FX Loop Output: Class A Switchable between 30, 15 and 7 watts Valves: Preamp = 2 x ECC83, Ouput = 4 x EL84, Effects Loop = 1 x ECC81 Speaker: 1 x 16 ohms, 2 x 8 ohms Dimensions (W x H x D): 55 x 24 x 24cm