B Stock - V4 The Jack Amplifier with Two Notes - S​/​N: 9997-01-24 Please note that this unit is the newest version of the V4 Jack, with the newer chassis, which does not feature the front "D bar". This is a B stock unit, and may show signs of wear, such as scuffs or other cosmetic markings. See photos. The all-rounder of the Victory V4 amp range, the Jack is the amp we developed with ‘Guthrie Govan’. Four valves in the front end, 180-watt power section, two channels, reverb and Two notes technology. Only 1.7kg ​/​ 3.75lbs – all the Jack tones in a small box! Channel one is clean to mild breakup while Channel two is glorious overdrive. The Jack is designed to be able to handle any situation and in the V4 amp format it’s portable, powerful and practical.