A large magnetization produced by a nuclear spin ensemble, when efficiently coupled to the LCR resonant circuit of the the NMR detection probe, can create a coherent radio frequency (rf) field with significant magnitude. If strong enough, such a field will efficiently act back on the precessing magnetization to rotate the latter back to its equilibrium direction, giving rise to a so-called maser pulse. This well-known phenomenon, improperly termed radiation damping (RD), has been studied decades ago and has motivated a wealth of methodological work aiming at its suppression or control in solution NMR. ] Such a magnetization behavior can also be generated in the solid state, when the spins are brought to a high level of polarization, as has been demonstrated using dynamic nuclear polarization (DNP) at liquid helium temperatures. Even less common is the observation of multiple, self-sustained, maser pulses in the solid state. A few such examples have been observed in the context of DNP at Helium or liquid Nitrogen temperatures.