I doubt the extra 10 ma will make a difference to the preamp. You could measure the DC resistance of the amp trigger input and verify how much it will actually draw at 12 volts.
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I think it was Niles that made a unit that would do the trick for you but I don't think it is made any longer. I have one and will have to look for it. It isn't on their website now. Send me an e-mail and let me know if you want me to look for it. I don't think the preamp will be hurt by pulling a little extra current to power on the amp input relay. Chances are it takes way less power than what is specified but may require the additional current only at startup.
I did find a Niles RF unit - actually a number of them still being made. Best I can tell these are stand alone units that I would program into my universal remote. Would have no connection to the Integra. Jason at Butler turned me on to it - Niles Audio MSU250.
Hard to say what the issue is - Integra says they output 100ma, Butler says they have to see 110. Seems kind of fussy but maybe the 12' cable run is contributing to the problem.