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(!!!) (~ Recommended Pair ~) 448A Western Electric tipped top used/good 1965-1966 (28ma and 29.2ma) (Matched on Amplitrex)
(!!!) (~ Recommended Pair ~) 448A Western Electric tipped top used/good 1965-1966 (28ma and 29.2ma) (Matched on Amplitrex)
$ 99.99
1 pair) 448A Western Electric "tipped top" used/good "D" getter halo in white boxes
1 tube) 28.0ma Gm=26,000 (6613=1966)
1 tube) 29.2ma Gm=26,000 (6526=1965)
Amplitrex Test Data:
Vplate=135V
Vscreen=135V
Vgrid=-2.5V
Good Ma range 18-25ma
Good Gm = 25,000
DIY pentode
See more: vacuum tube
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 (~ Recommended Pair ~) 448A Western Electric tipped top used/good 1965-1966 (28ma and 29.2ma) (Matched on Amplitrex)&Category=vacuum tube&ImageURL=http://tubeworldexpress.com/cdn/shop/products/1_d7866b1c-4e5e-4d9b-aad1-52c9b72c758d.jpg?v=1571439306){kind=link}
 (~ Recommended Pair ~) 448A Western Electric tipped top used/good 1965-1966 (28ma and 29.2ma) (Matched on Amplitrex) "Pin It")