Re: [Amps] Fan Noise in GS-35b Amplifiers

[peter chadwick <g8on@fsmail.net>]

Low audio noise means a big blower running slowly. There was an old 
professional tx with 16 4CX250B in a distributed amplifier (cabinet 7 foot 
high, 2 feet wide and 3 feet deep!) that had an external blower which was about 
3 feet in diameter and 2 or so feet wide, driven by a 3 phase motor at about 
750 or so rpm. That was quiet enough that you could hear the hiss of the air 
leaking out of the cabinet, but that was a very big blower.

73

Peter G3RZP


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