The legendary tone and portability of the all-tube Ampeg Portaflex amplifiers is faithfully reproduced in the PF-50T. This all-tube Portaflex head provides a harmonically rich and studio-worthy 50 watts of pure Ampeg tone to satisfy the most discerning bass player. Featur ing simple user-adjustable bias adjustment for easy tube replacement and pre-amp and transformer balanced direct outs for maximum versatility. Plus, no speaker load is required for silent recording or even use as a dedicated tube DI. Pair it with the PF-112HLF for the ultimate compact all-tube bass rig. RMS power output: 50W @ 4 or 8 ohms ; Preamp: All-tube [2] x 12AX7; Power amp: All-tube [1] x 12AU7, [2] x 6L6; 0db and -15db inputs; Tone controls: Bass, Mid, Treble; Mid-tone control: 5-position; Ultra Hi/Lo boosts; Input gain control; Preamp balanced line out; Pre/Post EQ; Ground lift; Transformer balanced line out; User adjustable bias control; Dimensions (H x W x D ): 185 x 353 x 264 mm; Weight: 8.8 kg.