Recent literature proposes a novel Active Mechanical Motion Rectifier (AMMR) based power take-off system. The primary objective of mechanical rectification in wave energy conversion schemes is to ensure controlled unidirectional rotation speed in the generator, aiming to mitigate losses caused by low rotational speed and enhance overall system efficiency. Despite the promising potential of this proposal, ensuring the stability and controllability of the entire system remains an unresolved challenge. In that regard, this work addresses the former issue by providing a preliminary assessment of the stability of a flap operating with the proposed AMMR-based power take-off. The studies conducted in this work set the fundamental basis to facilitate the design of an effective controller for this novel power take-off system. The obtained results are validated through insilico evaluations, modelling the system as piecewise linear.