(!!) (Best Single) UY-227 RCA Radiotron Balloon tests like new 1930 era (10.2ma)

UY-227 RCA Radiotron Balloon tests like new and like new condition 1930 era, fine mesh-plate in WB

10.2ma

Gm=900

Tested on Amplitrex

Vplate=250V

Vgriod=-21V

NOS Ma = 4.6-5ma

NOS Gm=900