The invention relates to an apparatus for magnetic resonance spectroscopy or tomography with a magnet (20) for generating a magnetic field in the direction of a z-axis in a working volume arranged on the z-axis by z = 0 and a cryogenic MR receiving (FIG. 29) and / or MR transmission device (24) with an electronic circuit having one or more semiconductor components (10), wherein the apparatus is set to an operating temperature below 100 K and a magnetic field B 0 of at least 1 T in the MR apparatus produce. At least one semiconductor junction of at least one of the semiconductor components (10) of the electronic circuit is arranged so that the average direction of movement of the charge carriers in the semiconductor junction is substantially parallel to the magnetic field lines of the magnetic field B 0, wherein the corresponding semiconductor component (10) is mounted directly on a carrier ( 12) is arranged, which is constructed of a material with good thermal conductivity properties. This ensures an unadulterated characteristic of the semiconductor components used despite the very strong magnetic field and the low operating temperatures. The invention further relates to a use of an electronic circuit in the MR apparatus.
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