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Author Topic: Broadband Tube Amplifier  (Read 7929 times)
G3RZP
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Posts: 1225




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« Reply #15 on: July 07, 2019, 05:05:08 AM »

Carl,

They were popular for a time for HF comms in the '60s and '70s, even though the DC - RF efficiency was around 20%. The Marconi HS113 distributed amplifier gave 1kW PEP out and drew 5kW at 0.9 PF from a 4 wire 3 phase star connected supply. (I believe that's referred to as a 'wye' supply in the US). The HS113 also had a drive unit producing ISB and FSK etc , all in the same 7 foot high cabinet, 2 foot wide and 2 foot 6 inches deep, with a separate blower with a fan some 3 feet in diameter and 12 inches wide! Sixteen 4CX250B in Class AB1 push pull.......weight somewhere around  half a ton. With no RF drive or output, it still drew about 4kW from the mains....
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