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12AU7 RCA NOS black plates early 1950's

12AU7 RCA NOS black plates early 1950's "D" getter halo spot welded to plate post (10/12ma)

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1 low noise tube) 12AU7 RCA NOS black plates early 1950's "D" getter halo spot welded to plate post (ACS) date code, white printing 

1 section) 10ma Gm=2100

1 section) 12ma Gm=2300

Good Ma range 8-10ma

 

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