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(!!!!) (Recommended Pair) 448A Western Electric tipped top used/test like new 1965-1966 (37.8ma and 39.0ma) (close Gm matching)
(!!!!) (Recommended Pair) 448A Western Electric tipped top used/test like new 1965-1966 (37.8ma and 39.0ma) (close Gm matching)
$ 139.99
1 pair) 448A Western Electric "tipped top" used/tests like new D getter halo in white boxes
1 tube) 37.8ma Gm=27,800 (6613=1966)
1 tube) 39.0ma Gm=28,000 (6552=1965) slightly larger bottle size
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/test like new 1965-1966 (37.8ma and 39.0ma) (close Gm matching)&Category=vacuum tube&ImageURL=http://tubeworldexpress.com/cdn/shop/files/1_1675a824-bd9c-4cdc-bb02-df501c1d1c49.jpg?v=1735332479){kind=link}
 (Recommended Pair) 448A Western Electric tipped top used/test like new 1965-1966 (37.8ma and 39.0ma) (close Gm matching) "Pin It")