While the Plinius 14 has both low- and high-gain settings, the low-gain setting is really too high for most moving-magnet cartridges, and appears instead designed for medium-gain moving-coils. Unless otherwise noted, the results are for the high-gain setting with unbalanced outputs.
The Plinius 14's output impedance was 170 ohms (right channel; slightly lower, at 163 ohms, in the left). At its balanced outputs, the output impedance measured 354 ohms. Its input impedance measured 47k ohms (L) and 45.6k ohms (R) at the 47k ohm setting of the input impedance…