56 Ultron UK used/good 1952 (4.5ma)
$ 8.99
56 Ultron UK used/good 1952
4.5ma
Gm=1300
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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