56 RCA used/good 1940's (4.7ma)
By Tube World
$ 8.99
56 RCA used/good 1940's
4.7ma
Gm=1200
Tested on Amplitrex:
Vplate=250V
Vgrid=-13.5V
Iplate good range = 4.5-5.5ma
Good used Gm=1200-1300
(Vfilament = 2.5 volts)See more: vacuum tube
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