(1) Tested RCA 6C5G Tube. Date Code X6.
(1) Tested RCA 8FQ7/8CG7 Tube Date Code EK RCA 8FQ7 Tube RCA 8CG7 Tube
(1) Tested RCA 6FQ7/6CG7 Tube Date Code BU RCA 6FQ7 Tube 6CG7 Tube
(1) Tested RCA 6AC7/1852 Tube Date Code RE6 RCA 6AC7 Tube 1852 Pentode Tube
(1) Tested RCA 6GW6/6DQ6B Tube Date Code BY RCA 6GW6 Tube 6DQ6 B Power Tube
(1) Tested RCA Type 24A Tube Date Code H2 RCA 24 A Tube Sharp Cutoff Tetrode
(1) Tested RCA 6BQ6GTB/6CU6 Tube Date Code NH RCA 6BQ6 GTB 6CU6 Tube
