Type 5881 (aka. 6L6WGB) vacuum tube. Hickok 539B tested. Hickok 539B is a mutual conductance (Gm) type tube tester. One tube, circa 1961, U.S.A.made by CBS. Tube#1 6200. <<<<< As pictured = The tube you see is the tube you receive.
Item Tag: 5881 (6L6WGB)
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1965 Tung-Sol 5881 (6L6WGB) Tube – Hickok 539B tests @ 4300, min:3300
Type 5881 (aka. 6L6WGB) vacuum tube. Hickok 539B tested. Hickok 539B is a mutual conductance (Gm) type tube tester. 5881 / U.S.A.3. Tube#1 4300. One tube, circa 1965, U.S.A.made by Tung-Sol. <<<<< As pictured = The tube you see is the tube you receive.