Vacuum tube type 5U4GB
Radio Corporation of America (RCA)
||Printed in grey on side of tube
box: 4 5/8 in x 1 5/8 in x 1 5/8 in; tube: 4 in x 1 5/8 in x 1 5/8 in
This octal tube has 5 of the original 8 connector pins extant. "RCA ELECTRON TUBE", the RCA logo, and "MADE IN U.S.A." are printed in orange on the tube collar.