Pair RF power amplifier vacuum sweep tubes Tested With Eico 667 Transconductance Tester Date 7635 Tested 114 On The Scale 0-140 Date 7717 Tested 116 On The Scale 0-140 Eico 667 Scale Minimum Useable Test Is 70 +/-10 Red/orange silkscreen both tubes. Base Diagram is 12FY Compactron BOTH Made by GE for Zenith TV Sets These Are New In Their Original Boxes I do combine items when and if possible or practical Some Variants Of This Tube Are: 6JM6 6JM6A 6JZ6 6KD6 6KE6 6KN6 6JS6 6JS6C 6LB6 6LR6 It is best to check before making any exchanges.Having collected 83000 tubes since 1955, I just can not remember detailed history of my tubes. The item "Pair NOS 6JS6B6JS6×2 Zenith/GE RF Lionear Power Amplifier Sweep Tubes EXC Test" is in sale since Saturday, September 23, 2017. This item is in the category "Collectibles\Radio, Phonograph, TV, Phone\Radios\Parts & Tubes". The seller is "w2srq" and is located in Calhan, Colorado. This item can be shipped worldwide.