(1) Tested RCA 6HS8 Tube with Box Date Code BV Sharp Cutoff Twin Pentode Tube

(1) Tested GE 6HS8 Tube with Box Date Code FE Sharp Cutoff Twin Pentode Tube

(1) Tested Zenith 6HS8 Tube Date Code 642 Sharp Cutoff Twin Pentode Tube

(1) Tested Raytheon 6HS8 Tube with Box Japan Code J-16 Sharp Cutoff Twin Pentode

(1) Tested RCA 6AG5 Tube with Box Date Code KH RCA Sharp Cutoff Pentode Tube

(1) Tested RCA 6GH8A Tube with Box Date Code HE Triode Sharp Cutoff Pentode Tube

(1) Tested RCA 3DT6A Tube with Box Date Code BM Sharp Cutoff Pentode Tube

(1) Tested RCA 3CE5 Tube with Box Date Code MI Sharp Cutoff Pentode Tube (b)