(!!!!) (Best Pair) CX-301A Cunningham and UX-201A RCA Balloon NOS 1930 era (3.1ma and 3.5ma)
(!!!!) (Good Value Pair) CX-301-A Cunningham used/good 1930 era (2.0ma and 2.0ma)
(!!!!) (Good Value Single) CX-301-A Cunningham used/good 1928 (2.6ma Gm=700)
(!!!) CX-301-A Cunningham NOS 1930 era (2.6ma Gm=800)
UX-201-A Radiotron used/very good 1930's (2.5ma Gm=700)
