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(!!) (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)
(!!) 227 National balloon used/good, rattle inside base 1930 era (5.3ma)
(!!) 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)
(!!) 71A Philco used/good 1930's (18.5ma)
(!!) 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) (Gm=60%)
(!!) UX-226 Radiotron Balloon used/65% (3.8ma, Gm=900)
(!!) UX-226 RCA Balloon NOS 1930 era (7.6ma, Gm=1000) (very nice single)
(!!) UX-245 RCA Radiotron Balloon used/good 1930's rattle inside base (20.8ma)
(!!) 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)
(!) (Best Single) UV-201-A Radiotron tests like new 1920's some scrapes on base (3.8ma)
(!) (Best Single) UX-112A RCA Balloon engraved base like new 1930 era (9.6ma)
