71A RCA Radiotron Balloon used/good 1930's (21ma)
By Tube World
$ 52.99
71A RCA Radiotron Balloon used/good 1930's
21ma
Gm=1700
Tested on Amplitrex
Vplate=180V
Vgrid=-38V
Good Ma = 20ma
Good Gm = 1600-1700
See more: vacuum tube
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