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(!!!!!) (BEST PAIR) 5687 Tungsol black plates "U" getter NOS 1954 (33.5/36ma and 35/36ma)

$ 179.99

1 low noise pair) 5687 Tungsol black plates "U" getter NOS 1954 very good printing

1 tube) 33.5/36.0ma Gm=11,400/11,700 (406=1954) JTL-5687

1 tube) 35.0/36.0ma Gm=11,100/11,200 (426) 5687

 

Tested on Amplitrex

Vplate=120V

Vgrid=-2V

Good Ma range 30-35ma

Good Gm range = 10K-12K

 

 

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Manley

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