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(!!!) (#1 5687 Tungsol 1950's) 5687 Tungsol black plates

(!!!) (#1 5687 Tungsol 1950's) 5687 Tungsol black plates "U" getter branded FEDERAL NOS mid-1950's (34ma/45ma)

$ 62.99

1 low noise tube) 5687 Tungsol black plates "U" getter branded FEDERAL NOS mid-1950's

34ma Gm=10,900

45ma Gm=12,000

 

Good Ma range 30-35ma

Tested on Amplitrex

 

 

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