Fig. 1 (left)—Single-acting or unbalanced armature pick-up. Fig 2 (right).—Differential or balanced armature pick-up.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19300523.2.57.1
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Radio Record, Volume III, Issue 45, 23 May 1930, Page 26
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14Fig. 1 (left)—Single-acting or unbalanced armature pick-up. Fig 2 (right).—Differential or balanced armature pick-up. Radio Record, Volume III, Issue 45, 23 May 1930, Page 26
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