jonheal Wrote: 
> I'm not an electrical engineer, but I know enough to know that noise is
> additive (not counting things like out-of-phase stuff cancelling itself
> out). If there's more noise when one power supply is plugged in vs. the
> other, than the extra noise is the result of the power supply --
> regardless of the preamp's noise level.

But what if as I said, the level of the amp noise is such that it masks
the SB noise? i.e. can you tell the difference between a xdB level of
noise and x+0.1xdB? 

Paul


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