For the best in battery powered phono preamps – the best choice is Hubble. It is a much improved derivative of the classic PHD. It takes PHD performance to a higher level with updated circuitry, new timer control of power and improved battery holders.
The PH3D is a high-value example of high-end performance. There are no frills – nothing fancy. The parts budget all goes towards putting really good parts into the signal path. Those quality parts, combined with refined circuitry have given much listening pleasure to its happy owners.