You said you have the RGR preamp. Turntable won't turn on unless the amp is on. Right away I think this is one of those cheap deals with switched outlets. Just to be sure though I do a search. Sure enough, there is a RGR preamp with two SWITCHED outlets on the back. This being the only thing that makes sense, and makes total sense, well read my reply.
First I get a dig in at fuzztone, saying he has no clue. Like we don't all know that already. Then I totally answer your question. That is the right answer, isn't it??
When someone is able to answer with specificity questions of such a precise nature for free, would you not agree they are underpaid?
Now if you would be so kind as to slip me a few Satoshi to my bitcoin address.....