(!!!) (Recommended Single) C-299=UV-99 Cunningham NOS 1920's with tube data sheet (2.6ma) (highest Ma) (UV have small pins) (strong Gm)
(!!!) 80 Cunningham Balloon used/good 1930 era some white oxide flakes inside tube (42/40 and 50/40)
(!!!) CX-380 Cunningham Balloon used/65% 1930 era some white oxide flakes inside tube (39/40 and 44/40)
(!!) (Best Single) 201A=UV-201-A Supertron Hoboken New Jersey NOS 1920's (3.8ma)
(!!) (Best Single) 26 Deforest Audion balloon tests like new 1920's (8.3ma, Gm=1300)
(!!) (Best Single) UY-227 RCA Radiotron Balloon tests like new 1930 era (10.2ma)
(!!) (Best Value Pair) 71A RCA Cunningham Radiotron used/good 1930's - 1940's same build (21.3ma and 22.2ma)
(!!) (DISPLAY TUBE) 180 Arcturus Blue 1930 era (does not work - display tube only)
(!!) (Recommended 27 Balloon) C-327 Cunningham Balloon mesh-plate used/very good 1930's (5.2ma)
(!!) 227 National balloon used/good, rattle inside base 1930 era (5.3ma)
(!!) 26 Arcturus by RCA NOS 1940's (8.5ma, Gm=1200)
(!!) 26 Cunningham NOS 1946 (5.4ma, Gm=1000)
(!!) 26 GE NOS 1946 (6.7ma, Gm=1200)
(!!) 26 RCA NOS 1946 (4.3ma, Gm=900)
(!!) 26 Super Silvertone by National Union NOS 1940's (5.7ma, Gm=1200)
(!!) 26 Tungsol NOS 1945 (4.4ma, Gm=1000)
(!!) C-327 Cunningham Balloon short mesh-plate used/very good 1930 (5.7ma)
(!!) ER-245=45 Eveready Raytheon Balloon box plate used/good 1932 (22ma)
(!!) UX-226 Radiotron Balloon used/65% (3.8ma, Gm=900)
(!!) UX-226 RCA Balloon NOS 1930 era (7.6ma, Gm=1000) (very nice single)