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This HF- PA works in early days in a Radiostation on a ship. It is made from the Marconi Company. The Network on the Output is realized with a double Coil. The network is originally made. There works either two QB 3.5/750 or two QB4/1100 or comparable types. The Power Supply is in 3 Phase mode and delivers either solid 2200 or 4000 V with 0.5A. This little power amplifier reached after a lot of work to a final state.
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