56 RCA Balloon engraved base black plate tests like new 1930's (4.7ma)
By Tube World
$ 49.99
56 RCA Radiotron Balloon engraved base black plate tests like new 1930's in white box
4.7ma
Gm=1500
(Vfilament = 2.5 volts)
Amplitrex Test:
Vplate=250V
Vgrid=-13.5V
NOS Ma range = 4.5-5.2ma
NOS Gm=1400
See more: vacuum tube
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