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(!!!) 31 RCA Radiotron Balloon NOS 1920's (13.2ma)
(!!!) CX-380 Cunningham Balloon used/65% 1930 era some white oxide flakes inside tube (39/40 and 44/40)
(!!) (Best Single) UY-227 RCA Radiotron Balloon tests like new 1930 era (10.2ma)
(!!) (Best Value Pair) 71A Philco and Aristocrat used/good 1930's similar build (25.6ma and 27ma) (same Gm)
(!!) (DISPLAY TUBE) 180 Arcturus Blue 1930 era (does not work - display tube only)
(!!) (Pair) 71A RCA Victor and Super Silvertone used/good 1930's - 1940's (21.5ma and 25ma) (Same Gm)
(!!) (Recommended 27 Balloon) C-327 Cunningham Balloon mesh-plate used/very good 1930's (5.2ma)
(!!) (Recommended Pair) UX-171A and CX-371A RCA/Cunningham Balloon used/test like new 1930 era same build (24.6ma and 27.2ma) (same Gm)
(!!) (Single) 46 RCA Radiotron / Cunningham Balloon used/good 1930's (46ma Gm=2200)
(!!) 71A Philco used/good 1930's (18.5ma)
(!!) C-327 Cunningham Balloon short mesh-plate used/very good 1930 (5.7ma)
(!!) ER-224A Eveready Raytheon Balloon used/tests very good 1930's (45/25) (4.1ma) (highest Ma)
(!!) UY-227 RCA Balloon NOS 1930 era (4.3ma)
(!!) UY-227 RCA Radiotron Balloon used/good 1930 era (3.5ma)
(!!) UY-227 RCA Radiotron Balloon used/good 1930 era (3.7ma)
(!!) UY-227 RCA Radiotron Balloon used/good 1930 era (3.8ma)
(!!) UY-227 RCA Radiotron Balloon used/good 1930 era (4.0ma)
(!) (#1 24A Balloon) 24A BRUNSWICK Balloon used/tests like new, small crack in base (48/25) (3.8ma)
(!) (#2 24 Balloon) 124 Crosley by Arcturus Balloon used/tests like new 1930's (48/25) (3.0ma)
(!) 247=47 RCA Balloon used/60-65% 1930's (20ma)
