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(!!!) (PAIR) 6HF5 Sylvania NOS 1970's (96ma and 97ma)

$ 74.99

1 pair) 6HF5 Sylvania NOS 1970's - same plate shape - slightly different internals

1 tube) 96ma Gm=10,600

1 tube) 97ma Gm=9800 larger heat sink attached to plate - faded printing

 

Tested on Amplitrex

Vplate=175V

Vscreen=125V

Vgrid=-25V

Good Ma range 90-125ma

Good Gm = 9,000 - 11,000

 

- Diathermy machine built by Mettler Electronics

See more: vacuum tube
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