DV Mark Maragold Greg Howe Signature 40W All Tube Guitar Head "Power: 40W (tube) Tubes: three ECC83 (preamp); two EL34, one ECC83 (power amp) Two channels Controls: gain, bass, middle, high (independent); presence (universal) Impedance: 4?, 8?, 16? FX loop with level switch, -10dB/+4dB 120V/240V switch Dimensions: 18.3"" x 8.3"" x 10.35"" Weight: 27.11 lb." "Tubes: three ECC83 (preamp); two EL34, one ECC83 (power amp)" Two channels "Controls: gain, bass, middle, high (independent); presence (universal)" "Impedance: 4?, 8?, 16?"