(!!!) (PAIR) 6HF5 Sylvania NOS 1970's (83ma and 85ma)

1 pair) 6HF5 Sylvania NOS 1970's

1 tube) 83ma Gm=8450

1 tube) 85ma Gm=8700

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