Labeled and boxed as General Electric (GE).
Manufactured by Tung Sol, labeled and boxed as GE, Sylvania, RCA, Raytheon, CBSetc. Great in your tweed Bassman and other Fenders and boutique amps that require 5881s.
Mike, 3 more matched pairs of the Tung Sol 5881 "Christmas Specials" (RCA label). The three pairs that you sent prior were really excellent specimens visually and sonically. Thanks. John