(!!!!) (Good Value Single) CX-301-A Cunningham used/good 1928 (2.6ma Gm=700)
UX-201-A RCA Radiotron Balloon tests like new 1930's (read review)
(!!!) (PAIR) UX-201-A Radiotron Balloon used/good brass pins 1930's (2.3ma and Gm=700 x 2 tubes)
(!!) UX-201-A Radiotron Balloon used/good brass pins 1930's (2.6ma and Gm=700)
01A Ken Rad NOS 1940's (3.4ma)
(Display tube) UV-201 Volutron brass base - does not work - in good condition - 1920's
01A National Union NOS 1940's (3.1ma)
01A Wards by Sylvania used/good 1940's (2.6ma Gm=700)
(!!!!) (Good Value Pair) CX-301-A Cunningham used/good 1930 era (2.0ma and 2.0ma)
(!!) (Best Single) 201A=UV-201-A Supertron Hoboken New Jersey NOS 1920's (3.8ma)
(!!!!) (BEST SINGLE) 201-A Silvertone Balloon NOS 1930 era (3.8ma and Gm=750)
(!!!) 201A Silvertone Balloon NOS 1930 era (1.8ma and Gm=500)
(!) 201A Aristocrat NOS 1930's (2.7ma and Gm=900)
(!!!) CX-301-A Cunningham NOS 1930 era (2.6ma Gm=800)
(!!!!) (Best Pair) CX-301A Cunningham and UX-201A RCA Balloon NOS 1930 era (3.1ma and 3.5ma)
(!) (Best Single) UV-201-A Radiotron tests like new 1920's some scrapes on base (3.8ma)
UV-202 Radiotron "brass base" and tipped NOS original box 1920 era (45ma) (very rare)
(DISPLAY TUBE) UV-201-A Radiotron "brass base and tipped" 1920's lights up nicely but no emission (display tube)
(!!!!) (Best Pair) 201A Silvertone Balloon NOS and like new 1930 era (4.2ma and 5.0ma) (Highest mA and Gm)
(Display tube) UV-201A Radiotron brass base 1920's (does not work)
