(!!) (Recommended Pair) 6HF5 Sylvania NOS 1960's (93ma and 97ma)
$ 79.99
1 pair) 6HF5 Sylvania NOS 1960's same build
1 tube) 93ma Gm=9300 Sylvania
1 tube) 97ma Gm=9450 Sylvania branded Philco
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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 (Recommended Pair) 6HF5 Sylvania NOS 1960's (93ma and 97ma)&Category=vacuum tube&ImageURL=http://tubeworldexpress.com/cdn/shop/products/1_41512a7d-12d1-4ac2-a00b-0c2d8f1ba629.jpg?v=1649138380){kind=link}
 (Recommended Pair) 6HF5 Sylvania NOS 1960's (93ma and 97ma) "Pin It")