(1) Tested RCA 12DB5 Tube with Box Date Code MI RCA Beam Power Tube

(1) Tested RCA 6DT5 Tube with Box Date Code DV Canada RCA Beam Power Tube (b)

(1) Tested RCA 12ED5 Tube with Box Date Code AF RCA Beam Power Tube

(1) Tested Strong RCA 6BK5 Tube with Box Date Code AY Beam Power Tube

(1) Tested RCA 6BK5 Tube with Box Date Code CL RCA 6BK5 Beam Power Tube (b)

(1) Tested RCA 6DT5 Tube with Box Date Code AL RCA 6DT5 Beam Power Tube

(1) Tested RCA 6BK5 Tube with Box Date Code CL RCA 6BK5 Beam Power Tube (d)

(1) Tested RCA 6DT5 Tube with Box Date Code DV Canada RCA Beam Power Tube (d)