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(!!) (Best Pair) 6HF5 Zenith by GE NOS and low hours/like new 1960's (125ma and 133ma) (Diathermy machine by Mettler Electronics)
(!!) (Best Pair) 6HF5 Zenith by GE NOS and low hours/like new 1960's (125ma and 133ma) (Diathermy machine by Mettler Electronics)
$ 72.99
1 pair) 6HF5 Zenith by GE same build
1 tube) 125ma Gm=10,600 (like new)
1 tube) 133ma Gm=11,000 (NOS)
Tested on Amplitrex
Vplate=175V
Vscreen=125V
Vgrid=-25V
Good used Ma range = 90-100ma
Good Gm = 9,000 - 10,000
- Diathermy machine built by Mettler Electronics
See more: vacuum tube
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 (Best Pair) 6HF5 Zenith by GE NOS and low hours/like new 1960's (125ma and 133ma) (Diathermy machine by Mettler Electronics) "Pin It")