I remain confused. I can't imagine a well respected manufacturer releasing an amp with audible hum. Don't know which Tekton speakers you have, but do know they are a bit more sensitive than many speakers, but hardly anything over the top in that area (like horn loaded speakers.)
I've had a number of "half size" amps (Bel Canto, VTV, Schiit) and none of them have exhibited any hum, even with my ear next to the speaker. And I've always heard nice things about Rega products.
Sounds like you either have a defective Rega or, for whatever reason, it is just a bad match for your setup. If I were you, I'd be moving on at this point.