(!!) (Best Pair) UX-201-A RCA Radiotron Balloon used/good 1930's (2.5ma and 2.5ma)
(!!) UX-201-A Radiotron Balloon used/good brass pins 1930's (2.3ma and Gm=700)
(!!) UX-201-A Radiotron Balloon used/good brass pins 1930's (2.6ma and Gm=700)
(!!) UX-201-A Radiotron Balloon used/tests like new brass pins 1930 era (4.4ma and Gm=800)
(!!) UX-201-A RCA Radiotron Balloon tests like new 1930's (3.0ma and Gm=800)
(Display tube) 201A Volutron brass base - does not work - in good condition - 1920's
01A National Union NOS 1940's (3.1ma)
01A Sylvania engraved used 1930's (2.5ma Gm=400)
