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47 RCA engraved base used/70% 1930's (24.5ma Gm=1850)

47 RCA engraved base used/70% 1930's (24.5ma Gm=1850)

$ 9.99

47 RCA engraved base used/70% 1930's (24.5ma Gm=1850)

 

(2.5 watts)

(2.5V filament)

See more: vacuum tube
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