Type 6L6GA vacuum tube. One tube,circa1955, U.S.A.made by Sylvania for Philco. Hickok TV-7B/U tested. Hickok TV-7B/U is a mutual conductance (Gm) type tube tester. Acid Etched Designation (Sylvania’s emblem) .
Type 6L6GA vacuum tube. One tube,circa1955, U.S.A.made by Sylvania for Philco. Hickok TV-7B/U tested. Hickok TV-7B/U is a mutual conductance (Gm) type tube tester. Acid Etched Designation (Sylvania’s emblem) .