(!!!) 6SN7GTB Westinghouse black plates copper grid posts "D" getter 1950's (7.2/8.4ma)

1 Low Noise tube) 6SN7GTB Westinghouse black plates copper grid posts "D" getter 1950's

1 section) 7.2ma Gm=2400

1 section) 8.4ma Gm=2600

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