| IMHO - The Realist needs a preamp at least for all the amps and boards I've tried. The hum may be coming from the impedance mismatch and having to raise the gain enough it may just be picking up stray hum. Nothing expensive, just a decent preamp.
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"The good thing about science is that it’s true whether or not you believe in it." - Neil DeGrasse Tyson 2011
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