<p>We present a new version of the gyrotron with an axis-encircling beam. In the new gyrotron, unlike the conventional large orbit gyrotron (LOG), non-adiabatic effects are not used to form an axis-encircling helical electron beam. Thus, a conventional magnet with a quasi-dipole field distribution can be employed here. The main feature of the proposed type of gyrotron is the breaking of the azimuthal symmetry of the electron–optical system. This modification can significantly reduce the cost and sizes of the gyrotron setup due to the use of compact magnet systems with a significantly smaller passage hole diameter. The output radiation power of the “compact” gyrotron is sufficient for spectroscopic applications of gyrotrons. Examples of a compact gyrotron with radiation frequencies of 395 and 593 GHz are given.</p>