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The purpose of using a centre-tap return connection on the secondary of transmitting tube's filament transformer is to:
prevent modulation of the emitted wave by the alternating current filament supply
A center-tapped filament transformer winding, with the center tap used for the cathode RF return, helps to balance out the AC voltage across the filament. This minimizes hum modulation (AC voltage variations appearing on the RF signal) that could occur if one side of the filament were grounded.
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