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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
Ships within 48 hours · Estimated delivery Jul 31 - Aug 5
US$40
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