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(!!!!) (Best Single 1958) 5687 Tungsol black plates

(!!!!) (Best Single 1958) 5687 Tungsol black plates "O" getter halo NOS 1957-1958 (34/35ma) (close triode balance)

$ 89.99

1 low noise tube) 5687 Tungsol black plates "O" getter halo NOS 1957-1958

34ma Gm=10,800

35ma Gm=10,700

 

Tested on Amplitrex 

Good Ma range 30-35ma

Good Gm range 10,000-12,000 

 

  

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