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257A Western Electric engraved base NOS 1930's (6 in stock) (257A is a 231D with a top cap grid connection)
257A Western Electric engraved base NOS 1930's (6 in stock) (257A is a 231D with a top cap grid connection)
$ 125.99
6) 257A WE "engraved base" NOS with tube data sheets, around 1940
$125 each
2 for $225
(257A=231D with top cap for grid connection)
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