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(!) UV-201-A RCA used/good 1930 era - no printing or etching on base (2.3ma)
UX-201-A Radiotron used/good 1930 era (2.4ma Gm=550)
(!!!) (Best Single) 201A=UV-201-A Supertron Hoboken New Jersey NOS 1926 (6.4ma)
(!!!) (BEST VALUE PAIR) 01A Sylvania engraved base used/good 1930's (2.4ma and 2.7ma) (same Gm)
01A Raytheon 4-Pillar box plate NOS 1930's (2.8ma)
(!!!!) (Best Pair #4) 01A Cunningham NOS 1940 era boxes were factory sealed (3.6ma and 3.4ma) (same Gm)
(!!!!) (Best Pair #3) 01A Cunningham NOS 1940 era boxes were factory sealed (3.4ma and 3.5ma) (same Gm)
