(!) RY-247=47 Federal Supreme Balloon used/good 1930's (24.2ma)
By Tube World
$ 29.99
RY-247=47 Federal Supreme Balloon used/good 1930's in WB
24.2ma
Gm=1750
Vplate=250V
Vscreen=250V
Vgrid=-15V
NOS Iplate=27ma
NOS Gm=2350
See more: vacuum tube
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 RY-247=47 Federal Supreme Balloon used/good 1930's (24.2ma)&Category=vacuum tube&ImageURL=http://tubeworldexpress.com/cdn/shop/files/1_770207e7-6493-459a-94b3-2a7a4a9961e5.jpg?v=1694444544){kind=link}
 RY-247=47 Federal Supreme Balloon used/good 1930's (24.2ma) "Pin It")