71A Raytheon 4-Pillar box-plate used/strong 1930's (24.8ma)
$ 39.99
71A Raytheon 4-Pillar box-plate used/strong 1930's engraved base
24.8ma
Gm=1600
SINGLE TUBE, NOT A PAIR
Tested on Amplitrex
Vplate=180V
Vgrid=-38V
Good Ma = 20ma
Good Gm = 1600-1700
(71A=5V @ .25A Filament)
Mu=3
Rplate=1.82Kohms
Rload=3Kohms
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