Mullard E88CC = 6922 Tube Dimple Disc Getter Warm Tone Mitcham 1968 7L1 -NOS

7L1 R8 E2 7L1 = E88CC production #1; R = Mitcham, 8= 1968, E = May, 4 = Week 4 of the production month. This tube is from the 1968 Mitcham production, the first generation of the famous dimple disc getter Mullard E88CC tubes that were only produced in the late 1960s and 1970s.