Originally posted by Chuck H
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Ultimate screen and bias voltage source: series 9v batteries in parallel with B+?
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As with many other things, there's a compromise involved.
Lower frequencies require *huge* transformer cores, higher ones increase losses dramatically, plus real higher ones (such as 400 Hz) have extra losses into long transmission lines.
400 Hz has a wavelength of 750Km, so a 375Km line is an *excellent* and very efficient 1/2 wave antenna !!!!
You'll read all about it at: Utility frequency - Wikipedia, the free encyclopediaJuan Manuel Fahey
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