There are two main switching noise issues to consdider with silicon diodes in rectifers: Firstly, a small voltage is need across the diode for the diode to conduct. This is typically 0. The consequence of this that there is a region around the zero crossing point of the input waveform where there is no conduction. This causes harmonics extending into RF to be induced on the power rails AND back into the transformer. These harmonics can be coupled to other windings, eg the filament supply.
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