Your preamp is of a simple design, although unconventional, not something exotic. Most amplifying devices (tubes, transistors) change the polarity of the input signal. In order to provide the correct polarity at the preamp output, another gain stage (tube, transistor, or transformer) has to be added, which means more wires, devices and $$$. The extra gain stage is found in most all "conventional" preamps.
Connect my amp out of phase?
My new preamp, AES / Ary AE-3 DJH says "connect your amplifier out of phase when using this preamp. The output of the AE-3 is inverting. Connect your speaker wire out of phase (+) to (-) and (-) to (+)." Is the only thing that I need to connect differently, the speaker cable?