(1) Tested RCA 6DT6A Tube Date Code CK RCA 6DT6 A Sharp Cut Off Pentode Tube

(1) Tested RCA 6DT6A Tube RCA 6DT6 A Sharp Cut Off Pentode Tube

(1) Tested RCA 6DT6 Tube Sharp Cut Off Pentode Tube

(1) Tested RCA 6CB6A Tube Sharp Cut Off Pentode RCA 6CB6 A Tube (c)

(1) Tested RCA 6AU6 Tube RCA Sharp Cut Off Pentode Vintage Tube (c)

5CG8 RCA Medium-Mu Triode Sharp-Cutoff Pentode Vacuum Tube - NOS - TESTED

(1) Tested RCA 6CB6 Tube with Box Sharp Cut Off Pentode Tube TV-10 Tested (a)

(1) Tested RCA 6CB6A Tube Sharp Cut Off Pentode RCA 6CB6 A Tube (a)