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(!!) (#1 5687 Tungsol single) 5687 Tungsol black plates NOS rebranded RCA large

(!!) (#1 5687 Tungsol single) 5687 Tungsol black plates NOS rebranded RCA large "O" getter halo around 1960 (34.5/36.5ma)

$ 59.99

1 low noise tube) 5687 Tungsol black plates NOS rebranded RCA large "O" getter halo around 1960

34.5ma Gm=11.500

36.5ma Gm=11,700



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