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(!!!!) 56 Arcturus Blue Balloon engraved base tests like new 1930's (5.0ma)
(!!!) (BEST PAIR #1) 47 RCA branded ARCTURUS NOS 1940's (34.5ma and 35.2ma)
(!!!) (BEST PAIR #2) 47 RCA branded ARCTURUS NOS 1940's (40ma and 40.2ma)
(!!!) (BEST PAIR #3) 47 RCA branded ARCTURUS NOS 1940's (40.5ma and 42ma)
(!!!) (Best Value Pair) 47 RCA branded ARCTURUS NOS 1940's (33.2ma and 33ma)
(!) 203A Sylvania brass base tests like new 1930's
(!) 247=47 RCA Balloon used/60-65% 1930's (20ma)
(!) 247=47 Tungsol Balloon used/good 1930's (23.2ma)
(!) 47 RCA Radiotron Balloon used/good 1930's (23.4ma)
(!) 47 RCA Radiotron engraved base used/good 1930's (27.5ma Gm=2250)
(!) NY-247=47 National Union Balloon used/good 1930's (22.6ma) (and strong Gm)
(!) RY-247=47 Federal Supreme Balloon used/good 1930's (24.2ma)
56 RCA Balloon engraved base black plate tests like new 1930's (4.7ma)
