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(!!!!) (Best Pair #1) 448A Western Electric tipped top used/test like new 1965 (27.2ma and 27.3ma) 1-2% matched
(!!!!) (Best Pair #1) 448A Western Electric tipped top used/test like new 1965 (27.2ma and 27.3ma) 1-2% matched
$ 139.99
1 pair) 448A Western Electric "tipped top" used/tests like new D getter halo in white boxes
1 tube) 27.2ma Gm=26,400 (6552=1965)
1 tube) 27.3ma Gm=26,600 (6539=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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 (Best Pair #1) 448A Western Electric tipped top used/test like new 1965 (27.2ma and 27.3ma) 1-2% matched "Pin It")