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RE: DIY Detail Magnifier

There are a few who view this RFI as entering the circuit via the feedback circuit. My not be as obvious with tubes and their output transformers, although the transformers will not really filter out the very high frequencies.


With transistorized gear, since modern devices are often designed for digital switching use, those very high RFI frequencies can start a small inaudible oscillation which can still affect sound. Not directly, obviously, as most of us can't hear such high frequencies. Those RF frequencies can generate sub harmonics where the differential of the oscillating frequencies can create a subharmonic in the audible range

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