The AC polarity could also be off on the wall plug. No reason to believe the crew that installed the outlets in the house got all the wires put on the plugs the right way. They work very fast.
You can buy a polarity checker at most hardware stores. Well worth it for a small price.
Conrad Johnson use to put 2 prong AC plugs on some of their preamps, so you could flip the cord and desire which ways sounds best to you.
You can buy a polarity checker at most hardware stores. Well worth it for a small price.
Conrad Johnson use to put 2 prong AC plugs on some of their preamps, so you could flip the cord and desire which ways sounds best to you.