Marshall JMP PA 20 Tube Amp main characteristic shares their simplicity of operation and superb natural valve tone. Achieving the beautifully organic and vibrant sound which is their trademark, can only be done in one way - crank 'em up! The result is pure, majestic tone uncluttered by unnecessary circuitry. With solos this produces a big, round, warm, sustain, full of classic character. With chord work you get a bark and percussive attack with a natural sounding break up, which allows each note to ring out in a glorious musical crunch. This item has been tested and is in working order. Serial number is: 7218E. Est weight: 24 lbs, 20" x 9" x 9"