(!!) UY-227 RCA Radiotron Balloon used/good 1930 era (3.8ma)

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