(!) 231D Western Electric 1949 with data sheet, glass chips inside tube (2.6ma)
$ 79.99
1 tube) 231D WE NOS 1949 with 231D data sheet, glass ships inside tube, chipped off glass arbor, tube works fine and has strong Ma and Gm
2.6ma Gm=600
Tested on Amplitrex
Vplate=90V
Vgrid=-3V
Good Ma = 1.6-2.1ma
Good Gm = 400-500
General Information
3V Filament @ 60ma, Vplate=90V, Iplate=2.1ma, Mu=8.4, Gm=510, Rp=16Kohms, Pout=4.5mW
Similar to UV-199 and 864
See more: vacuum tube
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 231D Western Electric 1949 with data sheet, glass chips inside tube (2.6ma) "Pin It")