The mystery tube in its wooden cage with the maze of equipment that feeds its tremendous power. The copper bar with its glass insulator at the lower right is the transmitting aerial of the strange ZT-6.
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https://paperspast.natlib.govt.nz/periodicals/RADREC19280615.2.2.2
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Radio Record, Volume I, Issue 48, 15 June 1928, Unnumbered Page
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36The mystery tube in its wooden cage with the maze of equipment that feeds its tremendous power. The copper bar with its glass insulator at the lower right is the transmitting aerial of the strange ZT-6. Radio Record, Volume I, Issue 48, 15 June 1928, Unnumbered Page
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