UX-201-A RCA Radiotron Balloon tests like new 1930's (read review)
UX-226 RCA Radiotron balloon used/good 1920's (3.7ma Gm=900)
UX-245 RCA Balloon (display tube) (gassy)
VR-150=VT-139=0D3 Sylvania NOS 1940's (argon)
VT-138=1629 RCA NOS 1940's 1/4" tilt bright eye
VT-138=JAN-CRC-1629 RCA NOS 1940's very slight glass tilt