I recently picked up a Boothill 5E3 kit and need to order a transformer set. Up here in Canada, Hammond looks to be a good bet. I was looking at the newer 290BBX. and trying to select an output transformer. Two options I was checking out: 1750E - 15 watts - impedance @8500 1750H - 20 watts - lower impedance @6600 I could use some advice if one is a better option over the other. Thanks!