The legendary tone and portability of the all-tube Ampeg Portaflex amplifiers is faithfully reproduced in the PF-20T. This all-tube Portaflex head provides a harmonically rich and studio-worthy 20 watts of pure Ampeg tone to satisfy the most discerning bass player. Featuring 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: 20W @ 4 or 8 ohms • Preamp: All-tube [2] x 12AX7 • Power amp: All-tube [2] x 6V6 • Tone controls: Bass, Mid, Treble • Input gain control • Preamp balanced line out • Pre/Post EQ • Ground lift • Transformer balanced line out • Ground lift • User adjustable bias control • Dimensions (H x W x D inches): • 7.3 x 13.0 x 10.4 in • 185 x 330 x 264 mm • Weight: 15.2 lb / 6.9 kg