(!!) UY-227 RCA Radiotron Balloon used/good 1930 era (3.8ma)
By Tube World
$ 14.99
UY-227 RCA Radiotron Balloon used/good 1930 era - very tiny rattle inside base
3.8ma
Gm=800
Tested on Amplitrex
Vplate=250V
Vgriod=-21V
NOS Ma = 4.6-5ma
NOS Gm=900
See more: vacuum tube
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 UY-227 RCA Radiotron Balloon used/good 1930 era (3.8ma)&Category=vacuum tube&ImageURL=http://tubeworldexpress.com/cdn/shop/products/1_d4fa0530-5298-4b6b-a1e9-ac0b51fbdbf2.jpg?v=1585858688){kind=link}
 UY-227 RCA Radiotron Balloon used/good 1930 era (3.8ma) "Pin It")