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Bellini preamplifier – Virtual Battery off line power supply 5 / 5
FFT Spectrum Analysis at Volume maximum
As you can see in the graphics the 50Hz component have been reduced to -120dB.
Probably that value is due much more to the influence the cables (a standard RCA
ones) get fron the environment. So we can expect the preamplifier to have an even
lower 50Hz component.