  We investigate PT -symmetry breaking transitions in a dimer comprising two LC
oscillators, one with loss and the second with gain. The electric energy of
this four-mode model oscillates between the two LC circuits, and between
capacitive and inductive energy within each LC circuit. Its dynamics are
described by a non-Hermitian, PT -symmetric Hamiltonian with three different
phases separated by two exceptional points. We systematically measure the
eigenfrequencies of energy dynamics across the three regions as a function of
gain-loss strength. In addition to observe the well-studied PT transition for
oscillations across the two LC circuits, at higher gain-loss strength,
transition within each LC circuit is also observed. With their extraordinary
tuning ability, PT -symmetric electronics are ideally suited for classical
simulations of non-Hermitian systems
