Well I did It! I managed to damage my phono pre-am (sigh)

Thanks Guys for the positive remarks.

@tablejockey 

I did reach out to SimAudio to see if there is an option to have it repaired.

I'll see what they say. Even when I get a new phono stage, if I can have this one repaired, I'd like to do that. 

i suggest if you are going to be swapping out power supplies to purchase a cheap voltemeter to check the polarity and voltages it's just insuranse that something like this dosen't happen by mistake , you can decide if you want a cheep one or a digital fluke it's all in the cost and peace of mind knowing that you have the correct polarity and voltage at the tip of the cable that you are going to use.

I was surprised to see your post. A couple of months ago, I sold the same Moon phono stage on eBay. Before it had even arrived, the buyer asked about using a "PS from China" that he had from another phono stage. I urged him not to use anything but the one that I shipped with the unit, unless it was approved by Sim Audio. A week after he received the device, he contacted me and said the thing had just quit working. I asked him if he used only the PS I shipped with it, and he said he did. I'm not sure I believe him, but based on eBay's policies, I decided to eat the cost, and do a return/refund. I opened it up, but I couldn't see or smell anything suspicious. Since I can't repair it myself, I decided it wasn't worth the cost of repairs. End of story.

I beg to differ with AI, if that is acceptable.  The owners manual of the Sim Audio phono says it comes with an external AC supply, emphasis on "AC".  The ifi LPS produces DC voltage. So AI cannot be correct about polarity of the iFi LPS being the cause of the problem, since DC has no polarity. Or to put it another way, if the Sim were equipped to receive DCV at its PS input, the sign of the DCV as determined by whether it is received on the ground plane or the B+ plane would probably not matter. The problem, I think, is that the LPS delivered DCV to the Sim that expects ACV. This means that the Sim must have rectifiers and filter capacitors built into it to convert incoming AC from its wall wart to DC.  But if you feed that internal PS with DCV, that’s probably not good.  Where many get in trouble is in thinking that all wall warts are the same. They are not. Some are just transformers (as in the case of the Sim, apparently) designed to step down the ACV coming from the wall and deliver it for rectification and filtering to a built in PS.  Other wall warts contain complete LPSs to deliver DCV to a component.