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(!!!) (Recommended Pair) 6L6WGB=5881 Sylvania black base NOS 1980-1987 same build (86ma and 91ma)

$ 139.99

1 matched pair) 6L6WGB=5881 Sylvania black base NOS 1980-1987 same build

1 tube) 86ma Gm=6600 (Sylvania branded Philips) extra grid heatsink above top mica

1 tube) 91ma Gm=6800 (Sylvania branded RCA 1979-1980 era)

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