EVH 5150 III LBX 15-watt Tube Head Amplifier Type: Tube Power Output: 15W (Full Power) - 4W (1/4 power switch) Speaker Jacks: 1 - 1/4" Output Preamp Tubes: 5 - JJ EECC83S Power Tubes: 2 - JJ EL84 (Matched Duet)