Universal Audio 4110 and Millenia HV-3D Mic Preamp Repairs

I was recently contacted by the owner of a local studio who had two high end microphone preamps (Universal Audio 4110, and Millennia HV-3D), both of which had developed noisy channels. In both cases the channel in question was producing a constant low level crackling sound, making it unusable. Unfortunately I found both manufacturers to be less than helpful in supporting the repair.

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