6HF5 Sylvania NOS 1970 era some small mica flakes inside tube (96ma)

6HF5 Sylvania NOS 1970 era – some mica flakes at bottom of tube – faded printing

96ma

Gm=9300

NOT A PAIR

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